# CVE-2026-88344: Memory corruption in n/a

> A crafted FlatBuffers schema can cause an out-of-bounds read in the lexer, leading to application crashes and denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Sep 2026
- **Updated:** 23 Sep 2026
- **Also known as:** GHSA-m2cr-9jfr-rmxm

## What is CVE-2026-88344?

CVE-2026-88344 is a high-severity memory corruption vulnerability in n/a, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An out-of-bounds read vulnerability exists in the schema lexer of flatcc 4c3b999e. When an exact-length FlatBuffers schema buffer ends with a digit, the integer digit-scan loop in lex() advances past the end of the input buffer and dereferences the out-of-bounds pointer. A specially crafted schema can trigger a one-byte heap buffer over-read, resulting in application crash and denial of service.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-88344?


## How do I fix CVE-2026-88344?

No fix has been published for CVE-2026-88344 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-88344 being exploited?

There is no known exploitation of CVE-2026-88344 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-88344 and fix it if it is affected.

What it is: CVE-2026-88344 is a high-severity memory corruption vulnerability in n/a, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-88344 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-88344/ (Markdown: https://insights.sbomify.com/CVE-2026-88344/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-88344
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88344
- OSV: https://osv.dev/vulnerability/CVE-2026-88344

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-88344/
Summaries are generated and may contain mistakes; the official description above is the record.