CVE-2026-116733: dvidelabs flatcc

Affected products, as the CNA wrote them
Vendor	Product	Versions
dvidelabs	flatcc pkg:github/dvidelabs/flatcc	affected 0.6.4 and earlier custom Other versions: unaffected

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

flatcc versions through 0.6.4 contain an out-of-bounds read in the __flatcc_json_parser_number function. An attacker who can supply untrusted JSON to a generated parser can send a number ending directly after a decimal point, causing the parser to read past the input buffer and potentially crash the application. The source gives no fixed version or workaround.

Written 14 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.3	Medium	4.0	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	CNA (VulnCheck)Used for this record
3.7	Low	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0042, the 36th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

26 Oct 2026, 21:52 UTC Confirmed by the CVE List
26 Oct 2026, 22:16 UTC Confirmed by NVD

Sources

References from the CNA

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#L539-L543 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-json-parser-number third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.