CVE-2025-40843: Buffer overflow in CodeChecker 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. bash #!/bin/bash
export CCLOGGERDEFDIRS=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.json
Impact Any environment where the vulnerable CodeChecker log command is executed with untrusted user input is affected by this vulnerability.
Other sources
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.
— MITRE
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-40843?
The severity of CVE-2025-40843 is classified as critical due to the potential for remote code execution.
How do I fix CVE-2025-40843?
To fix CVE-2025-40843, upgrade to CodeChecker version 6.26.2 or later.
Which versions of CodeChecker are affected by CVE-2025-40843?
CodeChecker versions up to 6.26.1 are affected by CVE-2025-40843.
What is the vulnerability type of CVE-2025-40843?
CVE-2025-40843 is a buffer overflow vulnerability.
What is the cause of CVE-2025-40843?
CVE-2025-40843 is caused by unsafe usage of the strcpy() function in the ldlogger library.