CVE catalog

CVE-2025-27220

Ruby vulnerabilities

In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method.

Severity: Medium · CVSS 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published: Feb 25, 2025, 11:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.76% · Oct 27, 2026

Projects and upstream resources

[ruby][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
Debianbookworm-security	ruby3.1	`3.1.2-7+deb12u1`	Affected	[CVE-2025-27220]
Debianbookworm	ruby3.1	Not reported	AffectedDistribution reports no fix	[CVE-2025-27220]
Debianbookworm	ruby3.1	`3.1.2-7+deb12u1`	Affected	[CVE-2025-27220]
UnknownRelease not reported	libruby3.2	`3.2.3-1ubuntu0.24.04.5`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	ruby3.1	Not reported	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	ruby3.2	`3.2.3-1ubuntu0.24.04.5`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	ruby3.2-dev	`3.2.3-1ubuntu0.24.04.5`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	ruby3.2-doc	`3.2.3-1ubuntu0.24.04.5`	UnknownSource applicability is not established	Provider not reported

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	libruby3.2	`3.2.3-1ubuntu0.24.04.5`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	ruby3.1	Not reported	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	ruby3.2	`3.2.3-1ubuntu0.24.04.5`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	ruby3.2-dev	`3.2.3-1ubuntu0.24.04.5`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	ruby3.2-doc	`3.2.3-1ubuntu0.24.04.5`	UnknownSource applicability is not established	Provider not reported
Debianbookworm	ruby3.1	Not reported	AffectedDistribution reports no fix	[CVE-2025-27220]
Debianbookworm	ruby3.1	`3.1.2-7+deb12u1`	Affected	[CVE-2025-27220]
Debianbookworm-security	ruby3.1	`3.1.2-7+deb12u1`	Affected	[CVE-2025-27220]

Original provider fields

{
  "package_releases": [
    {
      "name": "ruby3.1",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "3.1.2-7+deb12u1"
    },
    {
      "name": "ruby3.1",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "3.1.2-7+deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1103793,
      "name": "ruby3.1",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "ruby3.1",
      "fixed_version": "not yet fixed",
      "applicability_unknown": true
    },
    {
      "name": "ruby3.2",
      "fixed_version": "3.2.3-1ubuntu0.24.04.5",
      "applicability_unknown": true
    },
    {
      "name": "libruby3.2",
      "fixed_version": "3.2.3-1ubuntu0.24.04.5",
      "applicability_unknown": true
    },
    {
      "name": "ruby3.2-dev",
      "fixed_version": "3.2.3-1ubuntu0.24.04.5",
      "applicability_unknown": true
    },
    {
      "name": "ruby3.2-doc",
      "fixed_version": "3.2.3-1ubuntu0.24.04.5",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #1103793]

Publisher notes

[bookworm] ruby3.1: Minor issue

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libruby3.1]Unknown
Source package: [ruby3.1]
Details (4)
- 3.1.2-7+deb12u1 · amd64 · bookworm
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · arm64 · bookworm
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · amd64 · bookworm-security
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · arm64 · bookworm-security
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
[ruby3.1]Unknown
Details (4)
- 3.1.2-7+deb12u1 · amd64 · bookworm
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · arm64 · bookworm
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · amd64 · bookworm-security
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · arm64 · bookworm-security
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
[ruby3.1-dev]Unknown
Source package: [ruby3.1]
Details (4)
- 3.1.2-7+deb12u1 · amd64 · bookworm
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · arm64 · bookworm
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · amd64 · bookworm-security
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · arm64 · bookworm-security
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
[ruby3.1-doc]Unknown
Source package: [ruby3.1]
Details (4)
- 3.1.2-7+deb12u1 · all · bookworm
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · all · bookworm
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · all · bookworm-security
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12
- 3.1.2-7+deb12u1 · all · bookworm-security
  Affected
  usn · ruby3.1 · debian · bookworm; usn · ruby3.1 · debian · 12

[Debian 13 (Trixie)]

[libruby3.3]Unknown
Source package: [ruby3.3]
Details (2)
- 3.3.8-2 · amd64 · trixie
  Fixed · Fixed: 3.3.7-2
  usn · ruby3.3 · debian · 13
- 3.3.8-2 · arm64 · trixie
  Fixed · Fixed: 3.3.7-2
  usn · ruby3.3 · debian · 13
[ruby3.3]Unknown
Details (2)
- 3.3.8-2 · amd64 · trixie
  Fixed · Fixed: 3.3.7-2
  usn · ruby3.3 · debian · 13
- 3.3.8-2 · arm64 · trixie
  Fixed · Fixed: 3.3.7-2
  usn · ruby3.3 · debian · 13
[ruby3.3-dev]Unknown
Source package: [ruby3.3]
Details (2)
- 3.3.8-2 · amd64 · trixie
  Fixed · Fixed: 3.3.7-2
  usn · ruby3.3 · debian · 13
- 3.3.8-2 · arm64 · trixie
  Fixed · Fixed: 3.3.7-2
  usn · ruby3.3 · debian · 13
[ruby3.3-doc]Unknown
Source package: [ruby3.3]
Details (2)
- 3.3.8-2 · all · trixie
  Fixed · Fixed: 3.3.7-2
  usn · ruby3.3 · debian · 13
- 3.3.8-2 · all · trixie
  Fixed · Fixed: 3.3.7-2
  usn · ruby3.3 · debian · 13

Observed: Oct 26, 2026, 11:18:39 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]