# CVE-2026-2903

## Summary

- **CVE ID:** CVE-2026-2903
- **Severity:** MEDIUM
- **CVSS Score:** 4.8 (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)
- **CWE:** CWE-476, CWE-404
- **Published:** Feb 22, 2026
- **Last Modified:** Sep 14, 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.

## Affected Products

- skvadrik — re2c (4.0)
- skvadrik — re2c (4.1)
- skvadrik — re2c (4.2)
- skvadrik — re2c (4.3)
- skvadrik — re2c (4.4)

## References

- [CNA](https://vuldb.com/?id.347210)
- [CNA](https://vuldb.com/?ctiid.347210)
- [CNA](https://vuldb.com/?submit.755030)
- [CNA](https://github.com/skvadrik/re2c/issues/571)
- [CNA](https://github.com/skvadrik/re2c/issues/571#issuecomment-3837675101)
- [CNA](https://github.com/oneafter/0202/blob/main/re/repro)
- [CNA](https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97)
- [CNA](https://github.com/skvadrik/re2c/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.11%
- **EPSS Percentile:** 1.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._