CodeChecker open redirect when URL contains multiple slashes after the product name

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

• CVE-2025-1300: 0.27% estimated exploitation activity in the next 30 days; percentile 18.84 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary --- CodeChecker versions up to 6.24.5 contain an open redirect vulnerability due to missing protections against multiple slashes after the product name in the URL's path segment. This results in bypassing protections against CVE-2021-28861, leading to the same open redirect pathway. Details --- CodeChecker processes GET requests by first rewriting the path segment of the URL, and then passing the rewritten URL to the webserver framework. When trimming the product name from the URL, no sanitization was performed on the remaining URL, which reintroduced the same issue as CVE-2021-28861, leading to the same open redirect pathway using URLs such as /Default//attacker.com/%2f... Impact --- The vulnerability allows an attacker to create a hyperlink that looks like a legitimate CodeChecker URL, but redirects to an attacker-supplied website when clicked.

Published by the source

3 Mar 2025, 19:53 UTC

Last modified by the source

7 Jul 2026, 17:56 UTC

Source last checked

26 Oct 2026, 13:31 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-g839-x3p3-g5fm

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-g839-x3p3-g5fm

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-1300

Advisory: CodeChecker open redirect when URL contains multiple slashes after the product name
IDs: CVE-2025-1300, GHSA-g839-x3p3-g5fm
Record: https://patchnext.com/advisories/cve-2025-1300 (revision 2, source checked 26 Oct 2026, 13:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: codechecker 6.24.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI codechecker: affected <= 6.24.5; fixed in 6.24.6

## Suggested inspection (read-only)
- `python -m pip show codechecker`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on codechecker.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-g839-x3p3-g5fm (OSV record GHSA-g839-x3p3-g5fm lists affected ranges: PyPI codechecker >=0 <6.24.6 (fixed))
- Verified: https://github.com/advisories/GHSA-g839-x3p3-g5fm (GitHub-reviewed advisory GHSA-g839-x3p3-g5fm lists affected ranges: PyPI codechecker >=0 <=6.24.5)

Commands are suggestions: review each one before running it.