CVE catalog

CVE-2020-13757

python-rsa affected and fixed versions

Python-RSA before 4.1 ignores leading '\0' bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping an attacker to infer that an application uses Python-RSA, or if the length of accepted ciphertext affects application behavior (such as by causing excessive memory allocation).

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: May 27, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.43% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiantrixie	python-rsa	`4.7.2-1`	FixedDistribution-reported fixed boundary	[CVE-2020-13757]
Debiantrixie	python-rsa	`4.9-2`	Fixed	[CVE-2020-13757]
Debiansid	python-rsa	`4.7.2-1`	FixedDistribution-reported fixed boundary	[CVE-2020-13757]
Debiansid	python-rsa	`4.9-4`	Fixed	[CVE-2020-13757]
Debianforky	python-rsa	`4.7.2-1`	FixedDistribution-reported fixed boundary	[CVE-2020-13757]
Debianforky	python-rsa	`4.9-4`	Fixed	[CVE-2020-13757]
Debianbookworm	python-rsa	`4.7.2-1`	FixedDistribution-reported fixed boundary	[CVE-2020-13757]
Debianbookworm	python-rsa	`4.8-1`	Fixed	[CVE-2020-13757]

Showing 8 fix observations. All 43 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
PyPIRelease not reported	rsa	`4.1`	UnknownSource applicability is not established	Provider not reported
Debianbookworm	python-rsa	`4.7.2-1`	FixedDistribution-reported fixed boundary	[CVE-2020-13757]
Debianbookworm	python-rsa	`4.8-1`	Fixed	[CVE-2020-13757]
Debianforky	python-rsa	`4.7.2-1`	FixedDistribution-reported fixed boundary	[CVE-2020-13757]
Debianforky	python-rsa	`4.9-4`	Fixed	[CVE-2020-13757]
Debiansid	python-rsa	`4.7.2-1`	FixedDistribution-reported fixed boundary	[CVE-2020-13757]
Debiansid	python-rsa	`4.9-4`	Fixed	[CVE-2020-13757]
Debiantrixie	python-rsa	`4.7.2-1`	FixedDistribution-reported fixed boundary	[CVE-2020-13757]
Debiantrixie	python-rsa	`4.9-2`	Fixed	[CVE-2020-13757]
Opensuseleap 15.2	python-rsa	`3.4.2-lp152.4.3.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2021:0901-1]Feb 4, 2026, 2:43:57 AM UTC
Opensuseleap 15.3	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2021:2008-1]May 7, 2025, 6:11:26 PM UTC
Opensusetumbleweed	python-rsa	`4.7.2-1.5`	UnknownSource applicability is not established	[OPENSUSE-SU-2024:11269-1]Feb 4, 2026, 2:16:22 AM UTC
Opensusetumbleweed	python-rsa	`4.9-3.5`	UnknownSource applicability is not established	[OPENSUSE-SU-2024:14163-1]Feb 4, 2026, 2:18:43 AM UTC
Opensusetumbleweed	python-rsa	`4.9.1-1.4`	UnknownSource applicability is not established	[OPENSUSE-SU-2026:12041-1]Oct 5, 2026, 10:15:52 AM UTC
Suseenterprise storage 6	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Susehpe helion openstack 8	python-rsa	`3.4.2-3.3.1`	UnknownSource applicability is not established	[SUSE-SU-2022:3287-1]Feb 4, 2026, 4:10:35 AM UTC
Suselinux enterprise high performance computing 15 sp1-espos	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Suselinux enterprise high performance computing 15 sp1-ltss	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Suselinux enterprise module for basesystem 15 sp2	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Suselinux enterprise module for basesystem 15 sp3	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Suselinux enterprise module for package hub 15 sp2	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Suselinux enterprise module for package hub 15 sp3	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Suselinux enterprise module for public cloud 12	python-rsa	`3.1.4-12.16.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2237-1]Feb 4, 2026, 3:04:19 AM UTC
Suselinux enterprise module for public cloud 15	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Suselinux enterprise server 15 sp1-bcl	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Suselinux enterprise server 15 sp1-ltss	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Suselinux enterprise server for sap applications 15 sp1	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Susemanager proxy 4.0	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Susemanager retail branch server 4.0	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Susemanager server 4.0	python-rsa	`3.4.2-3.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2008-1]Feb 4, 2026, 3:38:48 AM UTC
Suseopenstack cloud 7	python-rsa	`3.1.4-12.16.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2237-1]Feb 4, 2026, 3:04:19 AM UTC
Suseopenstack cloud 8	python-rsa	`3.4.2-3.3.1`	UnknownSource applicability is not established	[SUSE-SU-2022:3287-1]Feb 4, 2026, 4:10:35 AM UTC
Suseopenstack cloud 9	python-rsa	`3.4.2-4.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2253-1]May 2, 2025, 4:30:28 AM UTC
Suseopenstack cloud crowbar 8	python-rsa	`3.4.2-3.3.1`	UnknownSource applicability is not established	[SUSE-SU-2022:3287-1]Feb 4, 2026, 4:10:35 AM UTC
Suseopenstack cloud crowbar 9	python-rsa	`3.4.2-4.4.1`	UnknownSource applicability is not established	[SUSE-SU-2021:2253-1]May 2, 2025, 4:30:28 AM UTC
Ubuntupro	python-rsa	`3.1.2-1`	UnknownSource applicability is not established	[USN-4478-1]Feb 10, 2026, 4:41:54 AM UTC
Ubuntupro	python-rsa	`3.1.2-1ubuntu0.1`	UnknownSource applicability is not established	[USN-4478-1]Feb 10, 2026, 4:41:54 AM UTC
Ubuntupro	python-rsa	`3.1.2-1ubuntu0.1+esm1`	UnknownSource applicability is not established	[USN-4478-1]Feb 10, 2026, 4:41:54 AM UTC
Ubuntupro	python-rsa	`3.4.2-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13757]Feb 4, 2026, 4:11:56 AM UTC
Ubuntupro	python-rsa	`3.4.2-1ubuntu0.1~esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13757]Feb 4, 2026, 4:11:56 AM UTC
Ubuntupro	python-rsa	`4.0-2`	UnknownSource applicability is not established	[USN-4478-2]Jun 25, 2026, 1:30:19 PM UTC
Ubuntupro	python-rsa	`4.0-3`	UnknownSource applicability is not established	[USN-4478-2]Jun 25, 2026, 1:30:19 PM UTC
Ubuntupro	python-rsa	`4.0-3ubuntu0.1~esm1`	UnknownSource applicability is not established	[USN-4478-2]Jun 25, 2026, 1:30:19 PM UTC

Original provider fields

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      "name": "python-rsa",
      "status": "fixed",
      "release": "sid",
      "version": "4.9-4"
    },
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    },
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      "name": "python-rsa",
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      "release": "trixie",
      "version": "4.9-2"
    },
    {
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      "status": "fixed",
      "release": "bookworm",
      "version": "4.8-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 962142,
      "name": "python-rsa",
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      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "4.7.2-1"
    },
    {
      "bug": 962142,
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    },
    {
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    },
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    },
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          ]
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      ],
      "release": "openstack cloud crowbar 8",
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    },
    {
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          ]
        }
      ],
      "release": "linux enterprise module for basesystem 15 sp2",
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      ],
      "release": "linux enterprise module for basesystem 15 sp3",
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      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:2008-1",
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      "release": "linux enterprise server 15 sp1-ltss",
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      "provider_record_id": "SUSE-SU-2021:2008-1",
      "provider_updated_at": "2026-02-04T03:38:48.853252Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ]
        }
      ],
      "release": "linux enterprise server for sap applications 15 sp1",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:2008-1",
      "fixed_version": "3.4.2-3.4.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:2008-1",
      "provider_updated_at": "2026-02-04T03:38:48.853252Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ]
        }
      ],
      "release": "manager proxy 4.0",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:2008-1",
      "fixed_version": "3.4.2-3.4.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:2008-1",
      "provider_updated_at": "2026-02-04T03:38:48.853252Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ]
        }
      ],
      "release": "manager retail branch server 4.0",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:2008-1",
      "fixed_version": "3.4.2-3.4.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:2008-1",
      "provider_updated_at": "2026-02-04T03:38:48.853252Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
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            },
            {
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            }
          ]
        }
      ],
      "release": "manager server 4.0",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:2008-1",
      "fixed_version": "3.4.2-3.4.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:2008-1",
      "provider_updated_at": "2026-02-04T03:38:48.853252Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
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            },
            {
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            }
          ]
        }
      ],
      "release": "enterprise storage 6",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:2008-1",
      "fixed_version": "3.4.2-3.4.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:2008-1",
      "provider_updated_at": "2026-02-04T03:38:48.853252Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
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            {
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            },
            {
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        }
      ],
      "release": "openstack cloud 7",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:2237-1",
      "fixed_version": "3.1.4-12.16.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:2237-1",
      "provider_updated_at": "2026-02-04T03:04:19.974854Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
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            {
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      ],
      "release": "linux enterprise module for public cloud 12",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:2237-1",
      "fixed_version": "3.1.4-12.16.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:2237-1",
      "provider_updated_at": "2026-02-04T03:04:19.974854Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
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            },
            {
              "fixed": "3.4.2-lp152.4.3.1"
            }
          ]
        }
      ],
      "release": "leap 15.2",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2021:0901-1",
      "fixed_version": "3.4.2-lp152.4.3.1",
      "provider_source": "pypi",
      "provider_record_id": "OPENSUSE-SU-2021:0901-1",
      "provider_updated_at": "2026-02-04T02:43:57.136880Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.9-3.5"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2024:14163-1",
      "fixed_version": "4.9-3.5",
      "provider_source": "pypi",
      "provider_record_id": "OPENSUSE-SU-2024:14163-1",
      "provider_updated_at": "2026-02-04T02:18:43.135362Z",
      "applicability_unknown": true
    },
    {
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        {
          "type": "ECOSYSTEM",
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            {
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            {
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            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2024:11269-1",
      "fixed_version": "4.7.2-1.5",
      "provider_source": "pypi",
      "provider_record_id": "OPENSUSE-SU-2024:11269-1",
      "provider_updated_at": "2026-02-04T02:16:22.748236Z",
      "applicability_unknown": true
    },
    {
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      "release": "leap 15.3",
      "versions": [],
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      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2021:2008-1",
      "fixed_version": "3.4.2-3.4.1",
      "provider_source": "pypi",
      "provider_record_id": "OPENSUSE-SU-2021:2008-1",
      "provider_updated_at": "2025-05-07T18:11:26.860392Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
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            {
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            }
          ]
        }
      ],
      "release": "openstack cloud 9",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:2253-1",
      "fixed_version": "3.4.2-4.4.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:2253-1",
      "provider_updated_at": "2025-05-02T04:30:28.703017Z",
      "applicability_unknown": true
    },
    {
      "name": "python-rsa",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.2-4.4.1"
            }
          ]
        }
      ],
      "release": "openstack cloud crowbar 9",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:2253-1",
      "fixed_version": "3.4.2-4.4.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:2253-1",
      "provider_updated_at": "2025-05-02T04:30:28.703017Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #962142]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[python3-rsa]Unknown
Source package: [python-rsa]
Details (2)
- 4.8-1 · all · bookworm
  Fixed · Fixed: 4.7.2-1
  dsa · python-rsa · debian · bookworm; dsa · python-rsa · debian · 12
- 4.8-1 · all · bookworm
  Fixed · Fixed: 4.7.2-1
  dsa · python-rsa · debian · bookworm; dsa · python-rsa · debian · 12

[Debian 13 (Trixie)]

[python3-rsa]Unknown
Source package: [python-rsa]
Details (2)
- 4.9-2 · all · trixie
  Fixed · Fixed: 4.7.2-1
  dsa · python-rsa · debian · 13
- 4.9-2 · all · trixie
  Fixed · Fixed: 4.7.2-1
  dsa · python-rsa · debian · 13

[openSUSE Tumbleweed]

[python313-rsa]Unknown
Source package: [python-rsa]
Details (1)
- 4.9.1-1.4 · noarch · tumbleweed
  Unknown · Fixed: 4.7.2-1.5, 4.9-3.5, 4.9.1-1.4
  Version impact unknown
  dsa · python-rsa · opensuse · tumbleweed
[python314-rsa]Unknown
Source package: [python-rsa]
Details (1)
- 4.9.1-1.4 · noarch · tumbleweed
  Unknown · Fixed: 4.7.2-1.5, 4.9-3.5, 4.9.1-1.4
  Version impact unknown
  dsa · python-rsa · opensuse · tumbleweed

Observed: Oct 23, 2026, 5:47:43 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]