{"id":"CVE-2026-2903","summary":"skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference","details":"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.","modified":"2026-10-06T02:36:38.939357695Z","published":"2026-02-22T00:32:09.412Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2903.json","cna_assigner":"VulDB","cwe_ids":["CWE-404","CWE-476"]},"references":[{"type":"WEB","url":"https://github.com/skvadrik/re2c/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2903.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2903"},{"type":"ADVISORY","url":"https://vuldb.com/?id.347210"},{"type":"ADVISORY","url":"https://vuldb.com/?submit.755030"},{"type":"REPORT","url":"https://github.com/skvadrik/re2c/issues/571"},{"type":"REPORT","url":"https://github.com/skvadrik/re2c/issues/571#issuecomment-3837675101"},{"type":"REPORT","url":"https://vuldb.com/?ctiid.347210"},{"type":"FIX","url":"https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97"},{"type":"EVIDENCE","url":"https://github.com/oneafter/0202/blob/main/re/repro"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/skvadrik/re2c","events":[{"introduced":"b8a4cddf80692486e8780d2a3ffc8a7e82acebbc"},{"fixed":"febeb977936f9519a25d9fbd10ff8256358cdb97"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"4.0"},{"last_affected":"4.0"},{"introduced":"4.1"},{"last_affected":"4.1"},{"introduced":"4.2"},{"last_affected":"4.2"},{"introduced":"4.3"},{"last_affected":"4.3"},{"introduced":"4.4"},{"last_affected":"4.4"}]}}],"versions":["4.0","4.1","4.2","4.3","4.4","4.3.1","4.0.2","4.0.1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-2903.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}