DDEV incomplete tar symlink traversal fix allows host file overwrite - Incomplete fix of CVE-2026-32885

Exploitation

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

CVSS

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

EPSS

• CVE-2026-108262: 0.31% estimated exploitation activity in the next 30 days; percentile 23.65 (FIRST EPSS, 2026-11-10). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The CVE-2026-32885 ZipSlip fix added a symlink-target escape check to Untar, but the check rebases an ABSOLUTE symlink target into dest before validating (filepath.Join(dest, "/etc") stays lexically inside dest and passes), while the symlink is then created with the RAW absolute target via os.Symlink(file.Linkname, ...), so a malicious archive plants a host-absolute symlink and a following regular-file entry writes through it, restoring arbitrary host file create/overwrite (reaching $HOME rc-files, hence RCE). Confirmed at HEAD.

The defect (the symlink check is a no-op for absolute targets) CVE-2026-32885 (fixed v1.25.2, commit 05cbe299) added a lexical containment check on the entry path and a NEW symlink-target validation. pkg/archive/archive.go, Untar, tar.TypeSymlink case: ```go if filepath.IsAbs(file.Linkname) { resolvedTarget = filepath.Join(dest, file.Linkname) // line 298: absolute target REBASED into dest } else { resolvedTarget = filepath.Join(fullPathDir,…

Published by the source

9 Nov 2026, 22:37 UTC

Last modified by the source

9 Nov 2026, 22:45 UTC

Source last checked

10 Nov 2026, 06:35 UTC

1. Revision 2 · amended · 10 Nov 2026

   Amended from osv record GHSA-9hq4-hm3j-jmph

2. Revision 1 · created · 9 Nov 2026

   Published from ghsa record GHSA-9hq4-hm3j-jmph

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# Patch Next advisory brief: CVE-2026-108262

Advisory: DDEV incomplete tar symlink traversal fix allows host file overwrite - Incomplete fix of CVE-2026-32885
IDs: CVE-2026-108262, GHSA-9hq4-hm3j-jmph
Record: https://patchnext.com/advisories/cve-2026-108262 (revision 2, source checked 10 Nov 2026, 06:35 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: github.com/ddev/ddev 1.25.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/ddev/ddev: affected < 1.25.4; fixed in 1.25.4

## Suggested inspection (read-only)
- Go github.com/ddev/ddev: check the installed version with your package manager.

## 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 github.com/ddev/ddev.
- 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://github.com/advisories/GHSA-9hq4-hm3j-jmph (GitHub-reviewed advisory GHSA-9hq4-hm3j-jmph lists affected ranges: Go github.com/ddev/ddev >=0 <1.25.4)
- Verified: https://osv.dev/vulnerability/GHSA-9hq4-hm3j-jmph (OSV record GHSA-9hq4-hm3j-jmph lists affected ranges: Go github.com/ddev/ddev >=0 <1.25.4 (fixed))

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