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Vulnerability · Published Feb 22, 2026 · Assigned by VulDB

CVE-2026-2903skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference

Low 3.3

In plain English

A low-severity null pointer dereference in re2c from skvadrik. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.3Low
Exploit odds (30 days)0.1%top 97.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12re2cno fix listedDEBIAN-CVE-2026-2903
Debian:13re2cno fix listedDEBIAN-CVE-2026-2903
Debian:14re2c4.5.1-1DEBIAN-CVE-2026-2903
Ubuntu:22.04:LTSre2cno fix listedUBUNTU-CVE-2026-2903
Ubuntu:24.04:LTSre2cno fix listedUBUNTU-CVE-2026-2903
Ubuntu:25.10re2cno fix listedUBUNTU-CVE-2026-2903
Ubuntu:26.04:LTSre2cno fix listedUBUNTU-CVE-2026-2903
Ubuntu:26.10re2cno fix listedUBUNTU-CVE-2026-2903

Affected products (as reported)

VendorProductVersions
skvadrik re2c 4.04.14.24.34.4

Weakness: CWE-476, CWE-404 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

References