{"id":"CVE-2026-116734","aliases":[],"title":"flatcc through 0.6.4 Out-of-Bounds Read via verifier check_header","description":"flatcc through 0.6.4 contains an integer overflow vulnerability in the check_header function of the FlatBuffers verifier because its overflow guard is dead code. On 32-bit builds, attackers can supply a crafted buffer offset that wraps the bounds check, causing an out-of-bounds read before the buffer and crashing the process.","severity":"medium","score":6.3,"published":"2026-10-26T21:52:34.998Z","modified":"2026-10-27T14:17:08.680Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://github.com/dvidelabs/flatcc/commit/0df9c097a19badc8bd22d93af8fd47bd291e5d9f","https://github.com/dvidelabs/flatcc","https://github.com/dvidelabs/flatcc/blob/v0.6.4/src/runtime/verifier.c#L126-L137","https://hackmd.io/@haindpwn/flatcc-json-number-oob-read","https://www.vulncheck.com/advisories/flatcc-through-0.6.4-out-of-bounds-read-via-verifier-check-header"],"sources":[{"name":"CVE","id":"CVE-2026-116734","modified":"2026-10-27T14:17:08.680Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-116734"}],"assessments":[{"source":"CNA","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","score":6.3},{"source":"CNA","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","score":3.7}]}