CVE-2026-4342 json
ingress-nginx comment-based nginx configuration injection
published 2026-03-19 7 mo ago modified 2026-06-17 4 mo ago also GHSA-f53h-mxv9-cp98 , GO-2026-4796 , EUVD-2026-13343
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.5%
- EPSS 1.5% chance of exploitation in 30 days, percentile 74%
- public exploits
- 0
- none known
Summary
A security issue was discovered in ingress-nginx where a combination of Ingress annotations can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller. (Note that in the default installation, the controller can access all Secrets cluster-wide.)
Patch / fix
- go k8s.io/ingress-nginx 0.0.0-20260319175635-5183b7d86137
- Kubernetes ingress-nginx 1.13.9, 1.14.5, 1.15.1
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2
suse advisories SUSE-SU-2026:1135-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
1.48% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | k8s.io/ingress-nginx | <0.0.0-20260319175635-5183b7d86137 |
0.0.0-20260319175635-5183b7d86137 |
Affected products
- Kubernetes ingress-nginx
Classification
- Weakness
-
- CWE-20 Improper Input Validation
- Technology feeds
References
-
github.com
/kubernetes/ingress-nginx/commit/5183b7d861377a9a2f6d2acaf44f8f6abd5cd0aa
web
-
github.com
/kubernetes/kubernetes/issues/137893
web, issue-tracking
-
openwall.com
/lists/oss-security/2026/03/19/9
web, mailing-list, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-4342
advisory
-
github.com
/kubernetes/ingress-nginx
package
-
github.com
/advisories/GHSA-f53h-mxv9-cp98
advisory
Sources
- CVE List CVE-2026-4342
- GitHub Advisory GHSA-f53h-mxv9-cp98
- NVD CVE-2026-4342
- OSV GO-2026-4796
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.