# CVE-2026-2903: re2c: A flaw has been found in skvadrik re2c up to 4.4

CVE-2026-2903 is fixed in re2c on 1 platform by DEBIAN-CVE-2026-2903 (version 4.5.1-1), released February 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-2903
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 22, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | re2c Debian 14 | 4.5.1-1 | [DEBIAN-CVE-2026-2903](https://patchblox.com/security/data/fix/linux/debian-cve-2026-2903.md) | Feb 22, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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