CVE-2026-88345 Details
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.
A vulnerability allowing out-of-bounds read has been identified in the schema lexer of Flatcc version 4c3b999e. This issue arises when a FlatBuffers schema of exact length ends with an unterminated quotation mark. The C-string scanning logic in the 'lex()' function improperly dereferences the input pointer after it has reached the end of the buffer. Exploitation of this vulnerability leads to a one-byte heap buffer over-read, causing the application to crash and resulting in a denial-of-service condition.
Users can update to the latest version of Flatcc, where this vulnerability has been fixed. The specific commit addressing this issue is available in the author's repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 22, 2026CISA-ADP
Assessed Sep 23, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/dvidelabs/flatcc/issues/385 | CISA-ADP | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/dvidelabs/flatcc/issues/385 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/jimjag/flatcc/commit/8581715e8ec4e5de8eea9fd6dad949e4dd7d0fa0 | [email protected] | Source CodeVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| dvidelabs flatcc | 4c3b999e3c0a423f9fd8df3c9e58ba9d2069d71b |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 23, 2026 | CVE Modified | CISA-ADP |
| Sep 22, 2026 | New CVE Received | [email protected] |