CVE catalog

CVE-2020-29562

glibc affected and fixed versions

The iconv function in the GNU C Library (aka glibc or libc6) 2.30 to 2.32, when converting UCS4 text containing an irreversible character, fails an assertion in the code path and aborts the program, potentially resulting in a denial of service.

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: Nov 19, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.68% · Oct 27, 2026

Projects and upstream resources

[glibc][Source-reported homepage]

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	glibc	`2.31-7`	FixedDistribution-reported fixed boundary	[CVE-2020-29562]
Debiantrixie	glibc	`2.41-12+deb13u4`	Fixed	[CVE-2020-29562]
Debiansid	glibc	`2.31-7`	FixedDistribution-reported fixed boundary	[CVE-2020-29562]
Debiansid	glibc	`2.43-7`	Fixed	[CVE-2020-29562]
Debianforky	glibc	`2.31-7`	FixedDistribution-reported fixed boundary	[CVE-2020-29562]
Debianforky	glibc	`2.43-7`	Fixed	[CVE-2020-29562]
Debianbookworm-security	glibc	`2.36-9+deb12u7`	Fixed	[CVE-2020-29562]
Debianbookworm	glibc	`2.31-7`	FixedDistribution-reported fixed boundary	[CVE-2020-29562]
Debianbookworm	glibc	`2.36-9+deb12u14`	Fixed	[CVE-2020-29562]

Showing 9 fix observations. All 29 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	glibc	`2.31-7`	UnknownSource applicability is not established	Provider not reported
Debianbookworm	glibc	`2.31-7`	FixedDistribution-reported fixed boundary	[CVE-2020-29562]
Debianbookworm	glibc	`2.36-9+deb12u14`	Fixed	[CVE-2020-29562]
Debianbookworm-security	glibc	`2.36-9+deb12u7`	Fixed	[CVE-2020-29562]
Debianforky	glibc	`2.31-7`	FixedDistribution-reported fixed boundary	[CVE-2020-29562]
Debianforky	glibc	`2.43-7`	Fixed	[CVE-2020-29562]
Debiansid	glibc	`2.31-7`	FixedDistribution-reported fixed boundary	[CVE-2020-29562]
Debiansid	glibc	`2.43-7`	Fixed	[CVE-2020-29562]
Debiantrixie	glibc	`2.31-7`	FixedDistribution-reported fixed boundary	[CVE-2020-29562]
Debiantrixie	glibc	`2.41-12+deb13u4`	Fixed	[CVE-2020-29562]
Ubuntu18.04	glibc	`2.26-0ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu18.04	glibc	`2.26-0ubuntu2.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu18.04	glibc	`2.27-0ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu18.04	glibc	`2.27-0ubuntu3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu18.04	glibc	`2.27-3ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu18.04	glibc	`2.27-3ubuntu1.2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu18.04	glibc	`2.27-3ubuntu1.3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu18.04	glibc	`2.27-3ubuntu1.4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu18.04	glibc	`2.27-3ubuntu1.5`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu20.04	glibc	`2.30-0ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu20.04	glibc	`2.30-0ubuntu3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu20.04	glibc	`2.31-0ubuntu5`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu20.04	glibc	`2.31-0ubuntu6`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu20.04	glibc	`2.31-0ubuntu7`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu20.04	glibc	`2.31-0ubuntu9`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu20.04	glibc	`2.31-0ubuntu9.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu20.04	glibc	`2.31-0ubuntu9.2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu20.04	glibc	`2.31-0ubuntu9.3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC
Ubuntu20.04	glibc	`2.31-0ubuntu9.7`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-29562]Apr 22, 2026, 12:40:32 PM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "glibc",
      "status": "fixed",
      "release": "sid",
      "version": "2.43-7"
    },
    {
      "name": "glibc",
      "status": "fixed",
      "release": "forky",
      "version": "2.43-7"
    },
    {
      "name": "glibc",
      "status": "fixed",
      "release": "trixie",
      "version": "2.41-12+deb13u4"
    },
    {
      "name": "glibc",
      "status": "fixed",
      "release": "bookworm",
      "version": "2.36-9+deb12u14"
    },
    {
      "name": "glibc",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "2.36-9+deb12u7"
    }
  ],
  "fixed_versions": [
    {
      "bug": 976391,
      "name": "glibc",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "2.31-7"
    },
    {
      "bug": 976391,
      "name": "glibc",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "2.31-7"
    },
    {
      "bug": 976391,
      "name": "glibc",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "2.31-7"
    },
    {
      "bug": 976391,
      "name": "glibc",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "2.31-7"
    }
  ],
  "distribution_packages": [
    {
      "name": "glibc",
      "fixed_version": "2.31-7",
      "applicability_unknown": true
    },
    {
      "name": "glibc",
      "ranges": [
        {
          "fixed": "",
          "introduced": "2.30",
          "last_affected": "2.32",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2020-29562",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2020-29562",
      "provider_updated_at": "2026-10-14T10:17:34.987"
    },
    {
      "name": "fedora",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2020-29562",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2020-29562",
      "provider_updated_at": "2026-10-14T10:17:34.987"
    },
    {
      "name": "e-series_santricity_os_controller",
      "ranges": [
        {
          "fixed": "",
          "introduced": "11.0.0",
          "last_affected": "11.60.3",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2020-29562",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2020-29562",
      "provider_updated_at": "2026-10-14T10:17:34.987"
    },
    {
      "name": "glibc",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.27-3ubuntu1.5"
            }
          ]
        }
      ],
      "release": "18.04",
      "versions": [
        "2.26-0ubuntu2",
        "2.26-0ubuntu2.1",
        "2.27-0ubuntu2",
        "2.27-0ubuntu3",
        "2.27-3ubuntu1",
        "2.27-3ubuntu1.2",
        "2.27-3ubuntu1.3",
        "2.27-3ubuntu1.4"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-29562",
      "fixed_version": "2.27-3ubuntu1.5",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-29562",
      "provider_updated_at": "2026-04-22T12:40:32.384828Z",
      "applicability_unknown": true
    },
    {
      "name": "glibc",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.31-0ubuntu9.7"
            }
          ]
        }
      ],
      "release": "20.04",
      "versions": [
        "2.30-0ubuntu2",
        "2.30-0ubuntu3",
        "2.31-0ubuntu5",
        "2.31-0ubuntu6",
        "2.31-0ubuntu7",
        "2.31-0ubuntu9",
        "2.31-0ubuntu9.1",
        "2.31-0ubuntu9.2",
        "2.31-0ubuntu9.3"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-29562",
      "fixed_version": "2.31-0ubuntu9.7",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-29562",
      "provider_updated_at": "2026-04-22T12:40:32.384828Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #976391]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[glibc-doc]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[glibc-source]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc6]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc6-dbg]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc6-dev]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc6-dev-i386]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc6-dev-x32]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc6-i386]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc6-x32]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc-bin]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc-dev-bin]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc-devtools]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[libc-l10n]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[locales]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[locales-all]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
[nscd]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-7
  dsa · glibc · debian · bookworm

Observed: Oct 23, 2026, 5:51:23 PM UTC

References

[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]