{"id":"CVE-2026-88345","title":"An out-of-bounds read vulnerability exists in the schema lexer of flatcc 4c3b999e","summary":"An out-of-bounds read vulnerability exists in the schema lexer of flatcc 4c3b999e. When an exact-length FlatBuffers schema ends with an unterminated quotation mark, the C-string scanning logic in lex() dereferences the input pointer afte…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-125"],"published":"2026-09-22","updated":"2026-09-23","sourceUpdated":"2026-09-23T15:17:23.390","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88345","references":[{"url":"https://github.com/dvidelabs/flatcc/issues/385","label":"cve@mitre.org"},{"url":"https://github.com/jimjag/flatcc/commit/8581715e8ec4e5de8eea9fd6dad949e4dd7d0fa0","label":"cve@mitre.org"},{"url":"https://github.com/dvidelabs/flatcc/issues/385","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-23T15:09:43.563884Z"},"epss":0.00219,"epssPercentile":0.12692,"ingestedAt":"2026-09-22T20:10:15.098Z","slug":"CVE-2026-88345","body":"## Overview\n\nAn out-of-bounds read vulnerability exists in the schema lexer of flatcc 4c3b999e. When an exact-length FlatBuffers schema ends with an unterminated quotation mark, the C-string scanning logic in lex() dereferences the input pointer after it has reached the end of the buffer. A specially crafted schema can trigger a one-byte heap buffer over-read, resulting in application crash and denial of service.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":209710,"id":"CVE-2026-88345","ts":1790177218989,"field":"exploit_available","old":"false","new":"true"},{"seq":209709,"id":"CVE-2026-88345","ts":1790177218989,"field":"cvss","old":null,"new":"7.5"},{"seq":209708,"id":"CVE-2026-88345","ts":1790177218989,"field":"severity","old":"none","new":"high"}]}