Out-of-bounds Read in Dvidelabs Flatcc
CVE-2026-116733
flatcc through 0.6.4 contains an out-of-bounds read vulnerability in __flatcc_json_parser_number that allows attackers to read past the input buffer via numbers ending in a decimal point. Attackers can supply untrusted JSON ending immediately after a decimal point to generated parsers, crashing applications when the buffer ends at an unmapped page.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/dvidelabs/flatcc/commit/356792dc155a9e685acdfe0ec1e209bdadcb4ab9 (patch)
- github.com/dvidelabs/flatcc (product)
- github.com/dvidelabs/flatcc/blob/v0.6.4/src/runtime/json_parser.c (technical-description)
- hackmd.io/@haindpwn/flatcc-json-number-oob-read (third-party-advisory)
- www.vulncheck.com/advisories/flatcc-through-0.6.4-out-of-bounds-read-via-flatcc… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116733?
- CVE-2026-116733 is a low-severity vulnerability in Dvidelabs Flatcc, classified under Out-of-bounds Read. CVSS score: 3.7/10. Published 2026-10-26.
- How severe is CVE-2026-116733?
- Low severity. CVSS v3 base score is 3.7 out of 10.