CVE catalog

CVE-2026-79772

Nokogiri versions before 1.19.1 fail to check the…

[CVE catalog]

Nokogiri versions before 1.19.1 fail to check the return value from xmlC14NExecute in the canonicalize method, returning an empty string on failure instead of raising an exception. Attackers can exploit this to bypass signature validation in downstream SAML libraries by providing invalid canonicalized XML that is incorrectly accepted as valid.

Severity
Medium · CVSS 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.34% · 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.

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

Provider details and historical evidence
Original provider fields
{
  "package_releases": [
    {
      "name": "ruby-nokogiri",
      "status": "fixed",
      "release": "sid",
      "version": "1.19.4+dfsg-1"
    },
    {
      "name": "ruby-nokogiri",
      "status": "fixed",
      "release": "forky",
      "version": "1.19.4+dfsg-1"
    },
    {
      "name": "ruby-nokogiri",
      "status": "vulnerable",
      "release": "trixie",
      "version": "1.18.2+dfsg-1"
    },
    {
      "name": "ruby-nokogiri",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "1.13.10+dfsg-2"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "ruby-nokogiri",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1.19.1+dfsg-1"
    },
    {
      "bug": null,
      "name": "ruby-nokogiri",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1.19.1+dfsg-1"
    },
    {
      "bug": null,
      "name": "ruby-nokogiri",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "ruby-nokogiri",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "nokogiri",
      "ranges": [
        {
          "fixed": "1.19.1",
          "introduced": "1.5.1",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "1.19.1",
      "provider_record_id": "NVD-CVE-2026-79772"
    },
    {
      "name": "nokogiri",
      "ecosystem": "rubygems",
      "fixed_version": "1.19.1",
      "provider_record_id": "GHSA-WX95-C6CV-8532"
    },
    {
      "name": "ruby-nokogiri",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "1.11.1+dfsg-2ubuntu1",
        "1.11.7+dfsg-3",
        "1.11.7+dfsg-3build1",
        "1.13.1+dfsg-2",
        "1.13.1+dfsg-2ubuntu0.1~esm1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-79772"
    },
    {
      "name": "ruby-nokogiri",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "1.6.6.2+ds-2build2",
        "1.6.6.3-1",
        "1.6.7-1",
        "1.6.7.1-1",
        "1.6.7.2-3",
        "1.6.7.2-3build1",
        "1.6.7.2-3ubuntu0.1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-79772"
    },
    {
      "name": "ruby-nokogiri",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "18.04",
      "versions": [
        "1.8.0-1",
        "1.8.1-1",
        "1.8.1-1build1",
        "1.8.2-1build1",
        "1.8.2-1ubuntu0.1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-79772"
    },
    {
      "name": "ruby-nokogiri",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "1.14.3+dfsg-2",
        "1.16.2+dfsg-1",
        "1.16.2+dfsg-1build1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-79772"
    },
    {
      "name": "ruby-nokogiri",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "1.18.2+dfsg-1build1",
        "1.18.10+dfsg-2",
        "1.18.10+dfsg-3"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-79772"
    }
  ]
}

Publisher notes

[trixie] ruby-nokogiri: Minor issue [bookworm] ruby-nokogiri: Minor issue

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [ruby-nokogiri]Unknown

    Source package: [ruby-nokogiri]

    Details (2)

    • 1.13.10+dfsg-2+b1 · amd64 · bookworm

      Affected

      nvd · ruby-nokogiri · debian · bookworm; nvd · ruby-nokogiri · debian · 12

    • 1.13.10+dfsg-2+b1 · arm64 · bookworm

      Affected

      nvd · ruby-nokogiri · debian · bookworm; nvd · ruby-nokogiri · debian · 12

[Debian 13 (Trixie)]

  • [ruby-nokogiri]Unknown

    Source package: [ruby-nokogiri]

    Details (2)

    • 1.18.2+dfsg-1+b1 · amd64 · trixie

      Affected

      nvd · ruby-nokogiri · debian · 13

    • 1.18.2+dfsg-1+b1 · arm64 · trixie

      Affected

      nvd · ruby-nokogiri · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]