{"id":"CVE-2026-2903","aliases":["AZL-78270","AZL-78273","BELL-CVE-2026-2903","DEBIAN-CVE-2026-2903","EUVD-2026-7705","GHSA-7948-p5vf-r2m4","UBUNTU-CVE-2026-2903"],"status":"published","title":"skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference","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.","severity":{"version":"4.0","score":4.8,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00132,"percentile":0.02787,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-404","CWE-476"],"published":"2026-02-22T00:32:09Z","modified":"2026-11-05T05:36:30Z","fixes":[{"ecosystem":"Alpaquita:25","package":"re2c","fixed_in":["4.2-r1"],"sources":["osv"]},{"ecosystem":"Alpaquita:stream","package":"re2c","fixed_in":["4.4-r1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"re2c","fixed_in":["4.5.1-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:2","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.0-1"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.1-4"}]}]},{"source":"osv","ecosystem":"Alpaquita:25","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2-r0"},{"fixed":"4.2-r1"}]}]},{"source":"osv","ecosystem":"Alpaquita:stream","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.1.1-r0"},{"fixed":"4.4-r1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0-2","3.1-1","4.0.1-1","4.0.2-1","4.1-1","4.2-1","4.3-1","4.3-2","4.3.1-1","4.4-1","4.5.1-1","4.6-1"]},{"source":"osv","ecosystem":"Debian:13","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1-1","4.2-1","4.3-1","4.3-2","4.3.1-1","4.4-1","4.5.1-1","4.6-1"]},{"source":"osv","ecosystem":"Debian:14","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.5.1-1"}]}],"versions":["4.1-1","4.2-1","4.3-1","4.3-2","4.3.1-1","4.4-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.3-1build1","2.2-1","3.0-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1-1","3.1-1build1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1-1","4.3-2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4-1","4.5.1-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"re2c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3-2","4.3.1-1","4.4-1"]}],"products":[{"vendor":"skvadrik","product":"re2c"}],"references":[{"url":"https://vuldb.com/?id.347210","tags":["vdb-entry","technical-description","advisory","report"]},{"url":"https://vuldb.com/?ctiid.347210","tags":["signature","permissions-required","report"]},{"url":"https://vuldb.com/?submit.755030","tags":["third-party-advisory","advisory","report"]},{"url":"https://github.com/skvadrik/re2c/issues/571","tags":["issue-tracking","report"]},{"url":"https://github.com/skvadrik/re2c/issues/571#issuecomment-3837675101","tags":["issue-tracking","report"]},{"url":"https://github.com/oneafter/0202/blob/main/re/repro","tags":["exploit","evidence","report"]},{"url":"https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97","tags":["patch","fix"]},{"url":"https://github.com/skvadrik/re2c/","tags":["product","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2903","tags":["web","advisory"]},{"url":"https://github.com/skvadrik/re2c"},{"url":"https://github.com/advisories/GHSA-7948-p5vf-r2m4"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-2903","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2903.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-2903","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-2903","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-2903","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-2903","title":"skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference","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.","status":"published","published":"2026-02-22T00:32:09.412Z","modified":"2026-06-23T15:50:16.004Z","cvss":[{"version":"4.0","score":4.8,"vector":"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","level":"medium","assessor":"cna"},{"version":"3.1","score":3.3,"vector":"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","level":"low","assessor":"cna"},{"version":"3.0","score":3.3,"vector":"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","level":"low","assessor":"cna"},{"version":"2.0","score":1.7,"vector":"AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C","assessor":"cna"}],"cwes":["CWE-476","CWE-404"],"updated_at":"2026-11-02T13:48:46.911326Z"}],"euvd":[{"id":"EUVD-2026-7705","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.","status":"published","published":"2026-02-22T00:32:09Z","modified":"2026-06-23T15:50:16Z","cvss":[{"version":"4.0","score":4.8,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T18:20:33.324654Z"}],"ghsa":[{"id":"GHSA-7948-p5vf-r2m4","title":"A flaw has been found in skvadrik re2c up to 4.4. Impacted is the function...","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.","status":"published","published":"2026-02-22T03:30:26Z","modified":"2026-02-22T03:30:33Z","cvss":[{"version":"4.0","score":1.9,"vector":"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-404"],"updated_at":"2026-11-02T15:06:18.587191Z"}],"nvd":[{"id":"CVE-2026-2903","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.","status":"published","published":"2026-02-22T01:16:00.563Z","modified":"2026-06-17T10:32:00.18Z","cvss":[{"version":"4.0","score":1.9,"vector":"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"},{"version":"2.0","score":1.7,"vector":"AV:L/AC:L/Au:S/C:N/I:N/A:P","level":"low","assessor":"secondary"}],"cwes":["CWE-404","CWE-476"],"updated_at":"2026-11-02T14:12:06.63895Z"}],"osv":[{"id":"BELL-CVE-2026-2903","status":"published","published":"2026-02-26T06:09:24.240292Z","modified":"2026-03-03T07:15:33.951965Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:28:23.315185Z"},{"id":"CVE-2026-2903","title":"skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference","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.","status":"published","published":"2026-02-22T00:32:09.412Z","modified":"2026-10-28T10:51:32.524798675Z","cvss":[{"version":"4.0","score":1.9,"vector":"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","level":"low"}],"cwes":["CWE-404","CWE-476"],"updated_at":"2026-11-02T15:45:00.530889Z"},{"id":"DEBIAN-CVE-2026-2903","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.","status":"published","published":"2026-02-22T01:16:00.563Z","modified":"2026-10-01T03:03:03.042982667Z","cvss":[{"version":"4.0","score":1.9,"vector":"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"}],"updated_at":"2026-11-02T15:45:53.877573Z"},{"id":"UBUNTU-CVE-2026-2903","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.","status":"published","published":"2026-02-22T01:16:00Z","modified":"2026-10-17T12:59:57.583583561Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low"},{"version":"4.0","score":1.9,"vector":"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","level":"low"}],"updated_at":"2026-11-02T16:56:11.640778Z"},{"id":"AZL-78270","title":"CVE-2026-2903 affecting package re2c 2.0-1","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.","status":"published","published":"2026-02-22T01:16:00Z","modified":"2026-04-21T04:34:23.679235Z","updated_at":"2026-11-02T15:28:09.747541Z"},{"id":"AZL-78273","title":"CVE-2026-2903 affecting package re2c 3.1-4","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.","status":"published","published":"2026-02-22T01:16:00Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:24.626116Z"}]}}