CVE-2025-40843 Buffer overflow in CodeChecker log command
A buffer overflow in CodeChecker's log command allows attackers to execute arbitrary code via crafted inputs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-40843?
CVE-2025-40843 is a medium-severity memory corruption vulnerability in Ericsson CodeChecker, published on 28 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
CodeChecker is an analyzer tooling, defect database and viewer extension for the Clang Static Analyzer and Clang Tidy.
CodeChecker versions up to 6.26.1 contain a buffer overflow vulnerability in the internal ldlogger library, which is executed by the CodeChecker log command.
This issue affects CodeChecker: through 6.26.1.
Weakness: CWE-121
Which versions are affected by CVE-2025-40843?
3 open source packages ship an affected version, including codechecker. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
codechecker PyPI | All versions | 6.26.2 |
codechecker PyPI | All versions | 6.26.2 |
codechecker PyPI | All versions | 6.26.2 |
Products include Ericsson Codechecker.
How do I fix CVE-2025-40843?
Upgrade codechecker to 6.26.2 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-40843 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-40843 exists.
Other vulnerabilities in Ericsson CodeChecker
- CVE-2024-10081 codechecker vulnerable to authentication bypass when using specifically crafted URLs
- CVE-2026-25660 Authentication bypass for certain API calls
- CVE-2024-10082 codechecker authentication method confusion vulnerability allows logging in as the built-in root user from an external service
- CVE-2024-53829 Cross-Site Request Forgery in CodeChecker API
- CVE-2023-49793 Path traversal in `CodeChecker server` in the endpoint of `CodeChecker store`
Sources
Also known as GHSA-5xf2-f6ch-6p8r, PYSEC-2025-100.