ubuntu-cve-2022-28738
Vulnerability from osv_ubuntu
Published
2022-05-09 18:15
Modified
2026-04-22 07:41
Summary
Details

A double free was found in the Regexp compiler in Ruby 3.x before 3.0.4 and 3.1.x before 3.1.2. If a victim attempts to create a Regexp from untrusted user input, an attacker may be able to write to unexpected memory locations.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libruby3.0",
            "binary_version": "3.0.2-7ubuntu2.1"
          },
          {
            "binary_name": "ruby3.0",
            "binary_version": "3.0.2-7ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "ruby3.0",
        "purl": "pkg:deb/ubuntu/ruby3.0@3.0.2-7ubuntu2.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.2-7ubuntu2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.2-5ubuntu1",
        "3.0.2-7",
        "3.0.2-7ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "A double free was found in the Regexp compiler in Ruby 3.x before 3.0.4 and 3.1.x before 3.1.2. If a victim attempts to create a Regexp from untrusted user input, an attacker may be able to write to unexpected memory locations.",
  "id": "UBUNTU-CVE-2022-28738",
  "modified": "2026-04-22T07:41:34Z",
  "published": "2022-05-09T18:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2022-28738"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/ruby/ruby/commit/052ec6d2585c3ace95671013d336f5543624ef3d"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/ruby/ruby/commit/73f45e5e96ccc13a131f7c0122cf8600ce5b930f"
    },
    {
      "type": "REPORT",
      "url": "https://www.ruby-lang.org/en/news/2022/04/12/double-free-in-regexp-compilation-cve-2022-28738/"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2022-28738"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5462-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2022-28738"
    }
  ],
  "related": [
    "USN-5462-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2022-28738"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.