---
title: "CVE-2026-88345: flatcc - Out of Bounds Read"
description: "flatcc 4c3b999e contains an out-of-bounds read caused by unterminated quotation mark in schema lexer lex() function, letting attackers cause application crash and denial of service, exploit requires crafted schema input."
url: https://panop.io/threat-heartbeat/CVE-2026-88345/
---

# CVE-2026-88345 flatcc - Out of Bounds Read

flatcc 4c3b999e contains an out-of-bounds read caused by unterminated quotation mark in schema lexer lex() function, letting attackers cause application crash and denial of service, exploit requires crafted schema input.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.41% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-88345)

## Details

Type

Out of Bounds Read

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

22 September 2026

Updated

15 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.html)

## Vendor fix

Update to the latest version of flatcc.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-88345](https://nvd.nist.gov/vuln/detail/CVE-2026-88345)
- [https://github.com/dvidelabs/flatcc/issues/385](https://github.com/dvidelabs/flatcc/issues/385)
- [https://github.com/jimjag/flatcc/commit/8581715e8ec4e5de8eea9fd6dad949e4dd7d0fa0](https://github.com/jimjag/flatcc/commit/8581715e8ec4e5de8eea9fd6dad949e4dd7d0fa0)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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