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4.8
Skvadrik Re2c 4.4 Null Pointer Crash
CVE-2026-2903
Summary
A bug in Skvadrik Re2c versions up to 4.4 can cause a crash when trying to process certain input. This means that if an attacker can make the program try to access a part of memory that doesn't exist, the program will crash. We recommend updating to the latest version to fix this issue.
Original title
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 ...
Original 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.
nvd CVSS2.0
1.7
nvd CVSS3.1
3.3
nvd CVSS4.0
4.8
Vulnerability type
CWE-404
CWE-476
NULL Pointer Dereference
- https://github.com/oneafter/0202/blob/main/re/repro
- https://github.com/skvadrik/re2c/
- https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97
- https://github.com/skvadrik/re2c/issues/571
- https://github.com/skvadrik/re2c/issues/571#issuecomment-3837675101
- https://vuldb.com/?ctiid.347210
- https://vuldb.com/?id.347210
- https://vuldb.com/?submit.755030
Published: 22 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026