Vulnerabilities in pkg:pypi/codechecker

PACKAGE
Advisory Identifier: GHSA-5xf2-f6ch-6p8r
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Advisory Summary

CVE-2025-40843 is a MODERATE (CVSS 5.9) codechecker has a buffer overflow vulnerability (CWE-121: Stack-based Buffer Overflow) affecting Codechecker libraries in the PyPI ecosystem. The issue involves codechecker has a buffer overflow in the log command. Remediation is available by upgrading affected packages to version 6.26.2.

8 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:pypi/codechecker

8 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/codechecker. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-5xf2-f6ch-6p8r CVE-2025-40843 MODERATE CodeChecker has a buffer overflow in the log command
GHSA-fxmx-pfm2-85m2 CVE-2021-44217 MODERATE Cross-site Scripting in Ericsson CodeChecker
GHSA-4v9x-cqc5-j645 CVE-2026-25660 CRITICAL Codechecker has an authentication bypass for certain API calls
GHSA-fpm5-2wcj-vfr7 CVE-2024-10082 CRITICAL codechecker authentication method confusion vulnerability allows logging in as the built-in root user from an external service
GHSA-f3f8-vx3w-hp5q CVE-2024-10081 CRITICAL codechecker vulnerable to authentication bypass when using specifically crafted URLs
GHSA-f8c8-4pm7-w885 CVE-2024-53829 HIGH Cross-Site Request Forgery in CodeChecker API
GHSA-g839-x3p3-g5fm CVE-2025-1300 MODERATE CodeChecker open redirect when URL contains multiple slashes after the product name
GHSA-h26w-r4m5-8rrf CVE-2023-49793 MODERATE CodeChecker has a Path traversal in `CodeChecker server` in the endpoint of `CodeChecker store`

CVE-2025-40843 at a Glance

CVE Identifier CVE-2025-40843
GHSA Identifier GHSA-5xf2-f6ch-6p8r
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-121: Stack-based Buffer Overflow
Affected Product Codechecker
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2025-40843

To remediate this vulnerability, upgrade all affected Codechecker dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

codechecker fixed: 6.26.2 
pip install codechecker>=6.26.2
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show codechecker

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2025-40843, inspect your installed packages using pip:

pip show codechecker

Analyze the terminal output to locate any version of Codechecker in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.26.2), your application is affected.

Note: The pip show codechecker command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-121: Stack-based Buffer Overflow, where a stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). In Codechecker, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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 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.json ``` ### Impact Any environment where the vulnerable `CodeChecker log` command is executed with untrusted user input is affected by this vulnerability.

CVE-2025-40843 Affected Codechecker Versions

1 component(s)
Fixed Versions:
6.26.2
Product / Package Ecosystem Affected Versions Fixed Version
codechecker
pypi/codechecker
PyPI
< 6.26.2
6.26.2

References

NVD — CVE-2025-40843 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-40843
GitHub Advisory / Wiki ADVISORY
https://github.com/Ericsson/codechecker/security/advisories/GHSA-5xf2-f6ch-6p8r
Security Fix Commit FIX COMMIT
https://github.com/Ericsson/codechecker/commit/4122eb1b43d00c880e4f0747d2ca0a674feb7a50
Codechecker Source Repository REPOSITORY
https://github.com/Ericsson/codechecker
Codechecker Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/codechecker/PYSEC-2025-100.yaml

Frequently Asked Questions

What is CVE-2025-40843?
CVE-2025-40843 is a security vulnerability in Codechecker involving CodeChecker has a buffer overflow in the log command under CWE-121: Stack-based Buffer Overflow.
Which Codechecker versions are affected?
Affected versions include releases prior to 6.26.2 across affected packages: codechecker.
What version fixes CVE-2025-40843?
Upgrading to 6.26.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is codechecker affected?
Yes, codechecker is affected in releases prior to 6.26.2. Upgrade your dependency to 6.26.2 or later.
What is the CVSS score of CVE-2025-40843?
CVE-2025-40843 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2025-40843?
CVE-2025-40843 is classified under CWE-121: Stack-based Buffer Overflow (A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).).
How can I check PyPI dependencies for CVE-2025-40843?
Run the dependency tree command: 'pip show codechecker'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5xf2-f6ch-6p8r",
  "modified" : "2026-06-05T14:33:10Z",
  "published" : "2025-09-22T18:04:20Z",
  "aliases" : [ "CVE-2025-40843" ],
  "summary" : "CodeChecker has a buffer overflow in the log command",
  "details" : "### Summary\nCodeChecker versions up to 6.26.1 contain a buffer overflow vulnerability in the internal `ldlogger` library, which is executed by the `CodeChecker log` command.\n\n### Details\nUnsafe 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.\n\n### PoC\nExample script is included below to illustrate how this vulnerability can be exploited.\n```bash\n#!/bin/bash\n\nexport CC_LOGGER_DEF_DIRS=1; \npayload=''; for i in $(seq 1 4090); do payload+='A'; done\n\nCodeChecker log -b \"/very/long/path/to/$payload/gcc a.c\" -o compilation.json\n```\n\n### Impact\nAny environment where the vulnerable `CodeChecker log` command is executed with untrusted user input is affected by this vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "codechecker"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "6.26.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 6.26.1"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/Ericsson/codechecker/security/advisories/GHSA-5xf2-f6ch-6p8r"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-40843"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Ericsson/codechecker/commit/4122eb1b43d00c880e4f0747d2ca0a674feb7a50"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Ericsson/codechecker"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/codechecker/PYSEC-2025-100.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-121" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-09-22T18:04:20Z",
    "nvd_published_at" : "2025-10-28T19:15:41Z"
  }
}