CVE-2026-2903 PUBLISHED

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.

• Oneafter (VulDB User) reporter

• VDB-347210 | skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference
• VDB-347210 | CTI Indicators (IOB, IOC, IOA)
• Submit #755030 | skvadrik re2c 04f1424 NULL Pointer Dereference
• https://github.com/skvadrik/re2c/issues/571
• https://github.com/skvadrik/re2c/issues/571#issuecomment-3837675101
• https://github.com/oneafter/0202/blob/main/re/repro
• https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97
• https://github.com/skvadrik/re2c/

• NULL Pointer Dereference CWE
• Denial of Service CWE