ubuntu-cve-2026-2903
Vulnerability from osv_ubuntu
Published
2026-02-22 01:16
Modified
2026-05-20 15:24
Summary
Details

A flaw has been found in skvadrik re2c up to 4.4. Impacted is the function check_and_merge_special_rules of the file src/parse/ast.cc. This manipulation causes null pointer dereference. The attack can only be executed locally. The exploit has been published and may be used. Patch name: febeb977936f9519a25d9fbd10ff8256358cdb97. It is suggested to install a patch to address this issue.

Severity
3.3 (Low)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
1.9 (Low)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
N/A (UNKNOWN)
low
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "re2c",
            "binary_version": "3.0-1"
          }
        ],
        "priority_reason": "This is only a crash is a command-line tool"
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "re2c",
        "purl": "pkg:deb/ubuntu/re2c@3.0-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.3-1build1",
        "2.2-1",
        "3.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "re2c",
            "binary_version": "3.1-1build1"
          }
        ],
        "priority_reason": "This is only a crash is a command-line tool"
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "re2c",
        "purl": "pkg:deb/ubuntu/re2c@3.1-1build1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1-1",
        "3.1-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "re2c",
            "binary_version": "4.3-2"
          }
        ],
        "priority_reason": "This is only a crash is a command-line tool"
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "re2c",
        "purl": "pkg:deb/ubuntu/re2c@4.3-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.1-1",
        "4.3-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "re2c",
            "binary_version": "4.4-1"
          }
        ],
        "priority_reason": "This is only a crash is a command-line tool"
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "re2c",
        "purl": "pkg:deb/ubuntu/re2c@4.4-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3-2",
        "4.3.1-1",
        "4.4-1"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw has been found in skvadrik re2c up to 4.4. Impacted is the function check_and_merge_special_rules of the file src/parse/ast.cc. This manipulation causes null pointer dereference. The attack can only be executed locally. The exploit has been published and may be used. Patch name: febeb977936f9519a25d9fbd10ff8256358cdb97. It is suggested to install a patch to address this issue.",
  "id": "UBUNTU-CVE-2026-2903",
  "modified": "2026-05-20T15:24:29Z",
  "published": "2026-02-22T01:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-2903"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-2903"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/oneafter/0202/blob/main/re/repro"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/skvadrik/re2c/"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/skvadrik/re2c/issues/571#issuecomment-3837675101"
    },
    {
      "type": "REPORT",
      "url": "https://vuldb.com/?ctiid.347210"
    },
    {
      "type": "REPORT",
      "url": "https://vuldb.com/?id.347210"
    },
    {
      "type": "REPORT",
      "url": "https://vuldb.com/?submit.755030"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-2903"
  ]
}



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