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High, CVSS 8.8amended

changedetection.io has Zip Slip vulnerability in the backup restore functionality

CVE-2026-29065GHSA-25g8-2mcf-fcx9

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (changedetection-io 0.54.4), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.8 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P · score source
EPSS
  • CVE-2026-29065: 0.59% estimated exploitation activity in the next 30 days; percentile 48.05 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary A Zip Slip vulnerability in the backup restore functionality allows arbitrary file overwrite via path traversal in uploaded ZIP archives. Details A Zip Slip vulnerability in the backup restore functionality allows arbitrary file overwrite via path traversal in uploaded ZIP archives. The application uses zipfile.extractall() without validating entry paths, allowing ../ sequences to escape the extraction directory. Vulnerable Code (lines 50-53): The extractall() function preserves the relative paths stored within the ZIP archive. When a malicious ZIP contains entries with ../ path traversal sequences, these files are extracted outside the intended directory. | Path in ZIP | Target File | Impact | | --- | --- | --- | | ../secret.txt | Flask secret key | Session forgery, auth bypass | | ../changedetection.json | App settings | Disable password, inject backdoor | | ../url-watches.json | Watch index | Inject malicious watches | | ../{uuid}/watch.json | Watch config | Modify any…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-25g8-2mcf-fcx9

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-25g8-2mcf-fcx9

Agent brief

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# Patch Next advisory brief: CVE-2026-29065

Advisory: changedetection.io has Zip Slip vulnerability in the backup restore functionality
IDs: CVE-2026-29065, GHSA-25g8-2mcf-fcx9
Record: https://patchnext.com/advisories/cve-2026-29065 (revision 3, source checked 26 Oct 2026, 13:37 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: changedetection-io 0.54.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI changedetection-io: affected <= 0.54.3; fixed in 0.54.4

## Suggested inspection (read-only)
- `python -m pip show changedetection-io`: 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 changedetection-io.
- 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-25g8-2mcf-fcx9 (OSV record GHSA-25g8-2mcf-fcx9 lists affected ranges: PyPI changedetection-io >=0 <0.54.4 (fixed))
- Verified: https://github.com/advisories/GHSA-25g8-2mcf-fcx9 (GitHub-reviewed advisory GHSA-25g8-2mcf-fcx9 lists affected ranges: PyPI changedetection-io >=0 <=0.54.3)

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