CVE-2026-116734
flatcc through 0.6.4 Out-of-Bounds Read via verifier check_header
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 26, 2026
- Updated
- Oct 27, 2026
- Reserved
- Oct 26, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | 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 | VulnCheck |
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-190 Integer Overflow or Wraparound
Affected Products
| Product | Versions |
|---|---|
flatccdvidelabs |
|
References
- Patch Commitpatch
- https://github.com/dvidelabs/flatccproduct
- https://github.com/dvidelabs/flatcc/blob/v0.6.4/src/runtime/verifier.c#L126-L137technical-description
- https://hackmd.io/@haindpwn/flatcc-json-number-oob-readthird-party-advisory
- VulnCheck Advisory: flatcc through 0.6.4 Out-of-Bounds Read via verifier check_headerthird-party-advisory
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