{"id":"CVE-2026-21876","aliases":["DEBIAN-CVE-2026-21876","DLA-4488-1","DSA-6105-1","EUVD-2026-1669","GHSA-36fv-25j3-r2c5","OESA-2026-1103","OESA-2026-1104","OESA-2026-1105","OESA-2026-1106","OESA-2026-1107","OESA-2026-1108","OESA-2026-1573","UBUNTU-CVE-2026-21876"],"status":"published","title":"OWASP CRS has multipart bypass using multiple content-type parts","description":"The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.","severity":{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.1735,"percentile":0.97156,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-794"],"published":"2026-01-08T13:55:37Z","modified":"2026-10-28T02:31:07Z","exploits":[{"source":"pocgithub","id":"Mefhika120/CVE-2026-21876","title":"Mefhika120/CVE-2026-21876","date":"2026-01-25","url":"https://github.com/Mefhika120/CVE-2026-21876"},{"source":"pocgithub","id":"CVEs-Labs/CVE-2026-21876","title":"CVEs-Labs/CVE-2026-21876","date":"2026-04-22","url":"https://github.com/CVEs-Labs/CVE-2026-21876"},{"source":"exploitdb","id":"EDB-52558","title":"coreruleset 4.21.0 - Firewall Bypass","type":"webapps","platform":"multiple","date":"2026-05-13","url":"https://www.exploit-db.com/exploits/52558"},{"source":"pocgithub","id":"daytriftnewgen/CVE-2026-21876","title":"daytriftnewgen/CVE-2026-21876","date":"2026-06-06","url":"https://github.com/daytriftnewgen/CVE-2026-21876"}],"fixes":[{"ecosystem":"Debian:12","package":"modsecurity-crs","fixed_in":["3.3.4-1+deb12u1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"modsecurity-crs","fixed_in":["3.3.7-1+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"modsecurity-crs","fixed_in":["3.3.8-1"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP2","package":"mod_security_crs","fixed_in":["3.3.5-3.oe2403sp2"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP3","package":"mod_security_crs","fixed_in":["3.3.5-3.oe2403sp3"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS-SP3","package":"mod_security_crs","fixed_in":["3.2.2-3.oe2203sp3"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS-SP4","package":"mod_security_crs","fixed_in":["3.2.2-3.oe2203sp4"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS","package":"mod_security_crs","fixed_in":["3.3.5-3.oe2403"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP1","package":"mod_security_crs","fixed_in":["3.3.5-3.oe2403sp1"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP4","package":"mod_security_crs","fixed_in":["3.2.2-3.oe2003sp4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.4-1+deb12u1"}]}],"versions":["3.3.4-1"]},{"source":"osv","ecosystem":"Debian:13","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.7-1+deb13u1"}]}],"versions":["3.3.7-1"]},{"source":"osv","ecosystem":"Debian:14","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.8-1"}]}],"versions":["3.3.7-1"]},{"source":"osv","ecosystem":"Debian:11","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.4-1~deb11u2"}]}],"versions":["3.3.0-1","3.3.0-1+deb11u1","3.3.2-1","3.3.4-1~deb11u1"],"bundled":2},{"source":"osv","ecosystem":"Debian:12","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.4-1+deb12u1"}]}],"versions":["3.3.4-1"]},{"source":"osv","ecosystem":"Debian:13","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.7-1+deb13u1"}]}],"versions":["3.3.7-1"]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP2","package":"mod_security_crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.5-3.oe2403sp2"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP3","package":"mod_security_crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.5-3.oe2403sp3"}]}]},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP3","package":"mod_security_crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.2-3.oe2203sp3"}]}]},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP4","package":"mod_security_crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.2-3.oe2203sp4"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS","package":"mod_security_crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.5-3.oe2403"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP1","package":"mod_security_crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.5-3.oe2403sp1"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP4","package":"mod_security_crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.2-3.oe2003sp4"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.9-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.0-3","3.0.2-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.1-1","3.2.0-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.0-1","3.3.2-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.5-1","3.3.5-2"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.7-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.8-1","3.3.9-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"modsecurity-crs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.7-1","3.3.8-1"]}],"products":[{"vendor":"coreruleset","product":"coreruleset"},{"vendor":"owasp","product":"owasp_modsecurity_core_rule_set"}],"references":[{"url":"https://github.com/coreruleset/coreruleset/security/advisories/GHSA-36fv-25j3-r2c5","tags":["x_refsource_CONFIRM","Exploit","Vendor Advisory","advisory","report"]},{"url":"https://github.com/coreruleset/coreruleset/commit/80d80473abf71bd49bf6d3c1ab221e3c74e4eb83","tags":["x_refsource_MISC","Patch","fix","report"]},{"url":"https://github.com/coreruleset/coreruleset/commit/9917985de09a6cf38b3261faf9105e909d67a7d6","tags":["x_refsource_MISC","Patch","fix","report"]},{"url":"https://github.com/coreruleset/coreruleset/releases/tag/v3.3.8","tags":["x_refsource_MISC","Product","Release Notes","web","report"]},{"url":"https://github.com/coreruleset/coreruleset/releases/tag/v4.22.0","tags":["x_refsource_MISC","Product","Release Notes","web","report"]},{"url":"https://github.com/daytriftnewgen/CVE-2026-21876","tags":["exploit","evidence"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21876.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21876","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-21876","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1103","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1104","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1105","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1106","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1107","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1108","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1573","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-21876","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-21876","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-21876","title":"OWASP CRS has multipart bypass using multiple content-type parts","description":"The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.","status":"published","published":"2026-01-08T13:55:37.102Z","modified":"2026-04-09T15:41:17.073Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical","assessor":"cna"}],"cwes":["CWE-794"],"updated_at":"2026-11-02T13:41:42.05254Z"}],"euvd":[{"id":"EUVD-2026-1669","description":"The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.","status":"published","published":"2026-01-08T13:55:37Z","modified":"2026-04-09T15:41:17Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"updated_at":"2026-11-02T19:24:30.741683Z"}],"nvd":[{"id":"CVE-2026-21876","description":"The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.","status":"published","published":"2026-01-08T14:15:57.087Z","modified":"2026-06-17T10:19:04.413Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-794"],"updated_at":"2026-11-02T14:12:03.683495Z"}],"osv":[{"id":"CVE-2026-21876","title":"OWASP CRS has multipart bypass using multiple content-type parts","description":"The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.","status":"published","published":"2026-01-08T13:55:37.102Z","modified":"2026-10-28T02:31:07.763484142Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"cwes":["CWE-794"],"updated_at":"2026-11-02T15:44:58.42038Z"},{"id":"DEBIAN-CVE-2026-21876","description":"The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.","status":"published","published":"2026-01-08T14:15:57.087Z","modified":"2026-10-01T03:03:20.580603785Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:53.097669Z"},{"id":"OESA-2026-1103","title":"mod_security_crs security update","description":"The base rules are provided for mod_security by this package.\r\n\r\nSecurity Fix(es):\n\nThe OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.(CVE-2026-21876)","status":"published","published":"2026-01-16T11:10:08Z","modified":"2026-08-18T01:19:27.419005078Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:45.339366Z"},{"id":"OESA-2026-1104","title":"mod_security_crs security update","description":"The base rules are provided for mod_security by this package.\r\n\r\nSecurity Fix(es):\n\nThe OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.(CVE-2026-21876)","status":"published","published":"2026-01-16T11:10:08Z","modified":"2026-08-18T01:19:27.517263243Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:45.339366Z"},{"id":"OESA-2026-1105","title":"mod_security_crs security update","description":"The base rules are provided for mod_security by this package.\r\n\r\nSecurity Fix(es):\n\nThe OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.(CVE-2026-21876)","status":"published","published":"2026-01-16T11:10:08Z","modified":"2026-08-18T01:19:27.601049826Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:45.339366Z"},{"id":"OESA-2026-1106","title":"mod_security_crs security update","description":"The base rules are provided for mod_security by this package.\r\n\r\nSecurity Fix(es):\n\nThe OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.(CVE-2026-21876)","status":"published","published":"2026-01-16T11:10:08Z","modified":"2026-08-18T01:19:27.383070816Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:45.339366Z"},{"id":"OESA-2026-1107","title":"mod_security_crs security update","description":"The base rules are provided for mod_security by this package.\r\n\r\nSecurity Fix(es):\n\nThe OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.(CVE-2026-21876)","status":"published","published":"2026-01-16T11:10:09Z","modified":"2026-08-18T01:19:27.368864051Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:45.339366Z"},{"id":"OESA-2026-1108","title":"mod_security_crs security update","description":"The base rules are provided for mod_security by this package.\r\n\r\nSecurity Fix(es):\n\nThe OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.(CVE-2026-21876)","status":"published","published":"2026-01-16T11:10:09Z","modified":"2026-08-18T01:19:27.463580115Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:45.339366Z"},{"id":"OESA-2026-1573","title":"mod_security_crs security update","description":"The base rules are provided for mod_security by this package.\r\n\r\nSecurity Fix(es):\n\nThe OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.(CVE-2026-21876)","status":"published","published":"2026-03-15T11:10:34Z","modified":"2026-08-18T01:19:36.913870979Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:45.721983Z"},{"id":"UBUNTU-CVE-2026-21876","description":"The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.","status":"published","published":"2026-01-08T14:15:00Z","modified":"2026-10-17T12:59:54.834100258Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:01.334185Z"},{"id":"DLA-4488-1","title":"modsecurity-crs - security update","status":"published","published":"2026-02-22T00:00:00Z","modified":"2026-02-22T10:30:29.546572Z","updated_at":"2026-11-02T15:46:12.7027Z"},{"id":"DSA-6105-1","title":"modsecurity-crs - security update","status":"published","published":"2026-01-21T00:00:00Z","modified":"2026-01-21T22:30:01.664626Z","updated_at":"2026-11-02T15:46:18.296714Z"}]}}