Low severity · published Oct 26, 2026
CVE-2026-116733
flatcc through 0.6.4 Out-of-Bounds Read via __flatcc_json_parser_number
New
3.7
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
flatcc · dvidelabs
through 0.6.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116733
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116733
github.com
https://github.com/dvidelabs/flatcc
github.com
https://github.com/dvidelabs/flatcc/blob/v0.6.4/src/runtime/json_parser.c#L539-L543
github.com
https://github.com/dvidelabs/flatcc/commit/356792dc155a9e685acdfe0ec1e209bdadcb4ab9
hackmd.io
https://hackmd.io/@haindpwn/flatcc-json-number-oob-read
www.vulncheck.com
https://www.vulncheck.com/advisories/flatcc-through-0.6.4-out-of-bounds-read-via-flatcc-json-parser-number
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