Vulnerability · Published Oct 26, 2026 · Assigned by VulnCheck
CVE-2026-116734flatcc through 0.6.4 Out-of-Bounds Read via verifier check_header
Low 3.7
In plain English
A low-severity integer overflow in flatcc from dvidelabs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).
Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.4%top 67.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- Patch Commit patch
- https://github.com/dvidelabs/flatcc product
- https://github.com/dvidelabs/flatcc/blob/v0.6.4/src/runtime/verifier.c#L126-L137 technical-description
- https://hackmd.io/@haindpwn/flatcc-json-number-oob-read third-party-advisory
- VulnCheck Advisory: flatcc through 0.6.4 Out-of-Bounds Read via verifier check_header third-party-advisory