{"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":"2026-08-12T15:32:14.462005Z","published":"2026-02-22T00:32:09.412Z","database_specific":{"cna_assigner":"VulDB","cwe_ids":["CWE-404","CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2903.json"},"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":{"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"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["4.0","4.1","4.2","4.3","4.4","4.3.1","4.0.2","4.0.1"],"database_specific":{"vanir_signatures":[{"deprecated":false,"digest":{"function_hash":"291586698837642700167099358298615316628","length":1962},"id":"CVE-2026-2903-50985907","signature_type":"Function","signature_version":"v1","source":"https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97","target":{"file":"src/parse/ast.cc","function":"check_and_merge_special_rules"}},{"deprecated":false,"digest":{"line_hashes":["51652395783220909632438727179018861303","88507521459474349026850757608611613912","11417266347209242241442601395639478243","37449041676600533087540737702601212130","220132697220520627608291557119638452585","196033581757968595210306518800825857608","99045384592536553511397574148745094117","80096842499926482670328789496206509507","80936037702368345783926879371942580424","63190400494898379930819946684056161491"],"threshold":0.9},"id":"CVE-2026-2903-b050b559","signature_type":"Line","signature_version":"v1","source":"https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97","target":{"file":"src/parse/ast.cc"}},{"target":{"file":"test/conditions/cond_error_10.c"},"deprecated":false,"digest":{"line_hashes":["51061471588528320011066460877264252129"],"threshold":0.9},"id":"CVE-2026-2903-e8921685","signature_type":"Line","signature_version":"v1","source":"https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-2903.json","vanir_signatures_modified":"2026-08-12T15:32:14Z"}}],"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"}]}