CVE-2026-88345
High
Description
An out-of-bounds read vulnerability exists in the schema lexer of flatcc 4c3b999e. When an exact-length FlatBuffers schema ends with an unterminated quotation mark, the C-string scanning logic in lex() dereferences the input pointer after it has reached the end of the buffer. A specially crafted schema can trigger a one-byte heap buffer over-read, resulting in application crash and denial of service.
SeverityHigh
CVSS7.5
Exploit probability—
ProductFlatcc
PublishedSep 22, 2026
First seenSep 22, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| flatcc | 4c3b999e | — |
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