CVE catalog

CVE-2026-9079

libcurl had a flaw that when instructed to clear proxy…

libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Jun 24, 2026, 12:18:38 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.06% · Oct 27, 2026

Projects and upstream resources

[curl][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.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "curl",
      "status": "fixed",
      "release": "sid",
      "version": "8.23.0-1"
    },
    {
      "name": "curl",
      "status": "fixed",
      "release": "forky",
      "version": "8.22.0-1"
    },
    {
      "name": "curl",
      "status": "vulnerable",
      "release": "trixie",
      "version": "8.14.1-2+deb13u5"
    },
    {
      "name": "curl",
      "status": "vulnerable",
      "release": "trixie-security",
      "version": "8.14.1-2+deb13u7"
    },
    {
      "name": "curl",
      "status": "not affected",
      "release": "bookworm",
      "version": "7.88.1-10+deb12u15"
    },
    {
      "name": "curl",
      "status": "not affected",
      "release": "bookworm-security",
      "version": "7.88.1-10+deb12u5"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "curl",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "8.21.0~rc2-1"
    },
    {
      "bug": null,
      "name": "curl",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "8.21.0~rc2-1"
    },
    {
      "bug": null,
      "name": "curl",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "curl",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": "0"
    }
  ],
  "distribution_packages": [
    {
      "name": "curl",
      "ecosystem": "cpe",
      "fixed_version": "8.5.0-2ubuntu10.10"
    },
    {
      "name": "libcurl3t64-gnutls",
      "ecosystem": "cpe",
      "fixed_version": "8.5.0-2ubuntu10.10"
    },
    {
      "name": "libcurl4-doc",
      "ecosystem": "cpe",
      "fixed_version": "8.5.0-2ubuntu10.10"
    },
    {
      "name": "libcurl4-gnutls-dev",
      "ecosystem": "cpe",
      "fixed_version": "8.5.0-2ubuntu10.10"
    },
    {
      "name": "libcurl4-openssl-dev",
      "ecosystem": "cpe",
      "fixed_version": "8.5.0-2ubuntu10.10"
    },
    {
      "name": "libcurl4t64",
      "ecosystem": "cpe",
      "fixed_version": "8.5.0-2ubuntu10.10"
    },
    {
      "name": "curl",
      "ecosystem": "cpe",
      "fixed_version": "8.21.0"
    },
    {
      "name": "curl",
      "ecosystem": "cpe",
      "fixed_version": "0"
    },
    {
      "name": "curl",
      "ranges": [
        {
          "fixed": "8.21.0",
          "introduced": "8.8.0",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "8.21.0",
      "provider_record_id": "NVD-CVE-2026-9079"
    },
    {
      "name": "curl",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "8.8.0"
            },
            {
              "fixed": "8.22.0-r0"
            }
          ]
        }
      ],
      "release": "3.23",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "8.22.0-r0",
      "provider_record_id": "ALPINE-CVE-2026-9079"
    },
    {
      "name": "curl",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "8.8.0"
            },
            {
              "fixed": "8.21.0-r0"
            }
          ]
        }
      ],
      "release": "3.24",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "8.21.0-r0",
      "provider_record_id": "ALPINE-CVE-2026-9079"
    },
    {
      "name": "curl",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.14.1-2ubuntu1.4"
            }
          ]
        }
      ],
      "release": "25.10",
      "versions": [
        "8.12.1-3ubuntu1",
        "8.13.0-5ubuntu1",
        "8.14.1-1ubuntu2",
        "8.14.1-1ubuntu3",
        "8.14.1-2ubuntu1",
        "8.14.1-2ubuntu1.1",
        "8.14.1-2ubuntu1.2",
        "8.14.1-2ubuntu1.3"
      ],
      "ecosystem": "deb",
      "fixed_version": "8.14.1-2ubuntu1.4",
      "provider_record_id": "UBUNTU-CVE-2026-9079"
    },
    {
      "name": "curl",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.18.0-1ubuntu2.2"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "8.14.1-2ubuntu1",
        "8.17.0-1ubuntu1",
        "8.18.0-1ubuntu1",
        "8.18.0-1ubuntu2",
        "8.18.0-1ubuntu2.1"
      ],
      "ecosystem": "deb",
      "fixed_version": "8.18.0-1ubuntu2.2",
      "provider_record_id": "UBUNTU-CVE-2026-9079"
    }
  ]
}

Publisher notes

[trixie] curl: Minor issue

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[curl]Unknown
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
[libcurl3-gnutls]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
[libcurl3-nss]Unknown
Source package: [curl]
Details (4)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
[libcurl4]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
[libcurl4-doc]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · all · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u15 · all · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · all · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · all · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · all · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · all · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
[libcurl4-gnutls-dev]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
[libcurl4-nss-dev]Unknown
Source package: [curl]
Details (4)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
[libcurl4-openssl-dev]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  nvd · curl · debian · bookworm

[Debian 13 (Trixie)]

[curl]Unknown
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Affected
  nvd · curl · debian · 13
[libcurl3t64-gnutls]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Affected
  nvd · curl · debian · 13
[libcurl4-doc]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · all · trixie
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u4 · all · trixie
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · all · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · all · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u7 · all · trixie-security
  Affected
  nvd · curl · debian · 13
[libcurl4-gnutls]Unknown
Source package: [curl]
Details (2)
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Affected
  nvd · curl · debian · 13
[libcurl4-gnutls-dev]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Affected
  nvd · curl · debian · 13
[libcurl4-openssl-dev]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Affected
  nvd · curl · debian · 13
[libcurl4t64]Unknown
Source package: [curl]
Details (5)
- 8.14.1-2+deb13u4 · amd64 · trixie
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u4 · arm64 · trixie
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · amd64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.21.0-2~bpo13+1 · arm64 · trixie-backports
  Affected
  nvd · curl · debian · 13
- 8.14.1-2+deb13u7 · amd64 · trixie-security
  Affected
  nvd · curl · debian · 13

Observed: Oct 27, 2026, 7:14:01 AM UTC

References

[CERT-Bund public 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] · [Ubuntu Security Notices (USN)]