{"id":"CVE-2026-120455","aliases":["EUVD-2026-115215","GHSA-pj6m-mgp5-m3qx","UBUNTU-CVE-2026-120455"],"status":"published","title":"rapidyaml through 0.16.0 Out-of-Bounds Write via ParseEngine::_add_annotation()","description":"rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine::_add_annotation() that allows attackers to corrupt memory by supplying YAML with excess anchors or tags. Attackers can submit YAML with consecutive anchors or tags to overflow the fixed two-element annotation array in release builds, corrupting stack memory and crashing the process.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00121,"percentile":0.01958,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2026-11-02T14:29:12Z","modified":"2026-11-10T02:45:24Z","affected":[{"source":"osv","ecosystem":"Ubuntu:26.10","package":"rapidyaml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.0+ds-1build1","0.11.1+ds-1","0.16.0+ds-2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"rapidyaml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.0+ds-3","0.10.0+ds-1","0.10.0+ds-1build1"]}],"products":[{"vendor":"biojppm","product":"rapidyaml"}],"references":[{"url":"https://github.com/biojppm/rapidyaml/issues/680","tags":["issue-tracking","report"]},{"url":"https://github.com/biojppm/rapidyaml/blob/v0.16.0/src/c4/yml/parse_engine.def.hpp#L4307-L4351","tags":["technical-description","article","report"]},{"url":"https://github.com/biojppm/rapidyaml/blob/v0.16.0/src/c4/yml/parse_engine.def.hpp#L5524-L5535","tags":["technical-description","article","report"]},{"url":"https://github.com/biojppm/rapidyaml/blob/v0.16.0/src/c4/yml/parse_engine.hpp#L249-L260","tags":["technical-description","article","report"]},{"url":"https://github.com/biojppm/rapidyaml/releases/tag/v0.16.0","tags":["release-notes","advisory","report"]},{"url":"https://hackmd.io/@haindpwn/rapidyaml-parser-annotation-oob-write","tags":["technical-description","article","report"]},{"url":"https://www.vulncheck.com/advisories/rapidyaml-through-0.16.0-out-of-bounds-write-via-parseengine-add-annotation","tags":["third-party-advisory","advisory","report"]},{"url":"https://hackmd.io/@haindpwn/cve-2026-120455-rapidyaml-parser-annotation-oob-write#Detailed-attack-steps","tags":["exploit","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120455","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-pj6m-mgp5-m3qx"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120455.json","tags":["advisory"]},{"url":"https://github.com/biojppm/rapidyaml","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-120455","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-120455","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-120455","title":"rapidyaml through 0.16.0 Out-of-Bounds Write via ParseEngine::_add_annotation()","description":"rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine::_add_annotation() that allows attackers to corrupt memory by supplying YAML with excess anchors or tags. Attackers can submit YAML with consecutive anchors or tags to overflow the fixed two-element annotation array in release builds, corrupting stack memory and crashing the process.","status":"published","published":"2026-11-02T14:29:12.335Z","modified":"2026-11-09T14:00:12.935Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-09T15:33:44.265689Z"}],"euvd":[{"id":"EUVD-2026-115215","description":"rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine::_add_annotation() that allows attackers to corrupt memory by supplying YAML with excess anchors or tags. Attackers can submit YAML with consecutive anchors or tags to overflow the fixed two-element annotation array in release builds, corrupting stack memory and crashing the process.","status":"published","published":"2026-11-02T14:29:12Z","modified":"2026-11-09T14:00:12Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-09T15:17:14.169746Z"}],"ghsa":[{"id":"GHSA-pj6m-mgp5-m3qx","title":"rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine:...","description":"rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine::_add_annotation() that allows attackers to corrupt memory by supplying YAML with excess anchors or tags. Attackers can submit YAML with consecutive anchors or tags to overflow the fixed two-element annotation array in release builds, corrupting stack memory and crashing the process.","status":"published","published":"2026-11-02T15:31:44Z","modified":"2026-11-09T15:31:49Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/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":"medium"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","level":"medium"}],"cwes":["CWE-787"],"updated_at":"2026-11-09T15:48:41.634645Z"}],"nvd":[{"id":"CVE-2026-120455","description":"rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine::_add_annotation() that allows attackers to corrupt memory by supplying YAML with excess anchors or tags. Attackers can submit YAML with consecutive anchors or tags to overflow the fixed two-element annotation array in release builds, corrupting stack memory and crashing the process.","status":"published","published":"2026-11-02T15:17:29.117Z","modified":"2026-11-09T14:17:06.76Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/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":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-09T16:14:54.431469Z"}],"osv":[{"id":"CVE-2026-120455","title":"rapidyaml through 0.16.0 Out-of-Bounds Write via ParseEngine::_add_annotation()","description":"rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine::_add_annotation() that allows attackers to corrupt memory by supplying YAML with excess anchors or tags. Attackers can submit YAML with consecutive anchors or tags to overflow the fixed two-element annotation array in release builds, corrupting stack memory and crashing the process.","status":"published","published":"2026-11-02T14:29:12.335Z","modified":"2026-11-11T02:30:29.126142047Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-787"],"updated_at":"2026-11-10T03:16:41.950556Z"},{"id":"UBUNTU-CVE-2026-120455","description":"rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine::_add_annotation() that allows attackers to corrupt memory by supplying YAML with excess anchors or tags. Attackers can submit YAML with consecutive anchors or tags to overflow the fixed two-element annotation array in release builds, corrupting stack memory and crashing the process.","status":"published","published":"2026-11-02T15:17:00Z","modified":"2026-11-05T04:42:52Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","level":"medium"},{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-05T13:33:25.727744Z"}]}}