What’s Vulnerable › Vulnerabilities

CVE-2026-2903: skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-22 · updated 2026-06-17
• Weakness: CWE-404

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, 4.1, 4.2, 4.3, 4.4

References

• 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

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