High
ingress-nginx comment-based nginx configuration injection
Type: advisorySources: OSV
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.)
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-4342
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 8 Nov 2026, 00:34 UTC · Revision 1
Source evidence
ingress-nginx comment-based nginx configuration injection
core-osv · Original sourcePublished 19 Mar 2026, 21:50 UTC
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.)
osv:CVE-2026-4342
Complete source record
{
"id": "e50f90f9d20cb209326e222a205ec6019aa1ceda7395e8f9e26f8a94bc875891",
"url": "https://osv.dev/vulnerability/CVE-2026-4342",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ingress-nginx comment-based nginx configuration injection",
"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.)",
"evidence": "osv:CVE-2026-4342",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-4342",
"aliases": [
"CVE-2026-4342",
"GHSA-f53h-mxv9-cp98",
"GO-2026-4796"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
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{
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"source": "CPE_STRING"
}
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}
}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4342.json"
}
}
],
"modified": "2026-10-28T02:30:52.248034698Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4342.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-4342",
"https://github.com/kubernetes/kubernetes/issues/137893",
"https://github.com/kubernetes/ingress-nginx"
],
"provider_metadata": {
"cwe_ids": [
"CWE-20"
],
"cna_assigner": "kubernetes",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4342.json"
}
},
"related_cves": [
{
"value": "CVE-2026-4342",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 521003,
"published_at": "2026-03-19T21:50:17.878+00:00"
}