CVE-2026-2903
skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference
- State
- Published
- Severity
- 4.8 Medium
- Published
- Feb 22, 2026
- Updated
- Jun 23, 2026
- Reserved
- Feb 20, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 4.8 Medium | 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 | VulDB |
| 3.1 | 3.3 Low | 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 | VulDB |
| 3.0 | 3.3 Low | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C | VulDB |
| 2.0 | 1.7 Low | AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
re2cskvadrik |
|
References
- VDB-347210 | skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereferencevdb-entrytechnical-description
- VDB-347210 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- Submit #755030 | skvadrik re2c 04f1424 NULL Pointer Dereferencethird-party-advisory
- https://github.com/skvadrik/re2c/issues/571issue-tracking
- https://github.com/skvadrik/re2c/issues/571#issuecomment-3837675101issue-tracking
- https://github.com/oneafter/0202/blob/main/re/reproexploit
- https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97patch
- https://github.com/skvadrik/re2c/product
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