CodeChecker has a buffer overflow in the log command
Summary
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.
Details
Unsafe usage of strcpy() function in the internal ldlogger library allows attackers to trigger a buffer overflow by supplying crafted inputs from the command line. Specifically, the destination buffer is stack-allocated with a fixed size of 4096 bytes, while strcpy() is called without any length checks, enabling an attacker to overrun the buffer.
PoC
Example script is included below to illustrate how this vulnerability can be exploited.
#!/bin/bash
export CC_LOGGER_DEF_DIRS=1;
payload=''; for i in $(seq 1 4090); do payload+='A'; done
CodeChecker log -b "/very/long/path/to/$payload/gcc a.c" -o compilation.jsonImpact
Any environment where the vulnerable CodeChecker log command is executed with untrusted user input is affected by this vulnerability.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | codechecker | < 6.26.2 | 6.26.2 |
References
- https://github.com/Ericsson/codechecker/security/advisories/GHSA-5xf2-f6ch-6p8r
- https://nvd.nist.gov/vuln/detail/CVE-2025-40843
- https://github.com/Ericsson/codechecker/commit/4122eb1b43d00c880e4f0747d2ca0a674feb7a50
- https://github.com/Ericsson/codechecker
- https://github.com/pypa/advisory-database/tree/main/vulns/codechecker/PYSEC-2025-100.yaml
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-121- Platform
- Python (PyPI)
- Package
codechecker- Disclosed
- 22.09.2025
- Updated
- 11.10.2026 12:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2025-100 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-5xf2-f6ch-6p8r - CC BY 4.0
Vulnerability history: codechecker
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 01.2022 05.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 1
- Medium 4
Disclosures per year
- 2022: 1
- 2023: 0
- 2024: 3
- 2025: 3
- 2026: 1
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CodeChecker has a buffer overflow in the log command this entry
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