CVE-2026-42574 json
apko dirFS has a symlink-following path traversal that allows multiple entry points to escape the build root
published 2026-05-04 6 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-28932 , GHSA-qq3r-w4hj-gjp6 , GO-2026-5589
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before version 1.2.5, a crafted .apk could install a TypeSymlink tar entry whose target pointed outside the build root, and a subsequent directory-creation or file-write entry in the same or later archive could traverse that symlink to reach host paths the build user could write to. This issue has been patched in version 1.2.5.
Patch / fix
- go chainguard.dev/apko 1.2.5
- chainguard apko 1.2.5
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | chainguard.dev/apko | >=0.14.8, <1.2.5 |
1.2.5 |
Affected products
- chainguard-dev apko
Classification
References
-
github.com
/chainguard-dev/apko/pull/2187
web
-
github.com
/chainguard-dev/apko/commit/f5a96e1299ac81c7ea9441705ec467688086f442
web
-
github.com
/chainguard-dev/apko/security/advisories/GHSA-qq3r-w4hj-gjp6
web, advisory
-
github.com
/chainguard-dev/apko/releases/tag/v1.2.5
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-42574
advisory
-
github.com
/chainguard-dev/apko
package
Sources
- CVE List CVE-2026-42574
- GitHub Advisory GHSA-qq3r-w4hj-gjp6
- NVD CVE-2026-42574
- OSV GO-2026-5589
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.