Fission builder accepts arbitrary buildcmd strings from Environment.spec.builder.command, allowing the builder pod to invoke arbitrary executables
Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.23.0, before the round-1 security sweep, pkg/builder/builder.go passed Environment.spec.builder.command directly into exec.Command(...) after a strings.Fields split, with no validation of the executable path or its arguments. A user who could create or update Environment CRDs in a namespace observed by the buildermgr could thereby point the builder pod at any executable inside the builder image (e.g. /bin/sh -c '...') and execute arbitrary code in the builder pod context. This issue has been patched in version 1.23.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-46618
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 03:52 UTC · Revision 1
Source evidence
Fission builder accepts arbitrary buildcmd strings from Environment.spec.builder.command, allowing the builder pod to invoke arbitrary executables
core-osv · Original sourcePublished 10 Jun 2026, 17:20 UTC
Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.23.0, before the round-1 security sweep, pkg/builder/builder.go passed Environment.spec.builder.command directly into exec.Command(...) after a strings.Fields split, with no validation of the executable path or its arguments. A user who could create or update Environment CRDs in a namespace observed by the buildermgr could thereby point the builder pod at any executable inside the builder image (e.g. /bin/sh -c '...') and execute arbitrary code in the builder pod context. This issue has been patched in version 1.23.0.
osv:CVE-2026-46618
Complete source record
{
"id": "241e7769788dd46a750a16231b81b577dfed17c76b7563c154e49a539f7106c8",
"url": "https://osv.dev/vulnerability/CVE-2026-46618",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fission builder accepts arbitrary buildcmd strings from Environment.spec.builder.command, allowing the builder pod to invoke arbitrary executables",
"summary": "Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.23.0, before the round-1 security sweep, pkg/builder/builder.go passed Environment.spec.builder.command directly into exec.Command(...) after a strings.Fields split, with no validation of the executable path or its arguments. A user who could create or update Environment CRDs in a namespace observed by the buildermgr could thereby point the builder pod at any executable inside the builder image (e.g. /bin/sh -c '...') and execute arbitrary code in the builder pod context. This issue has been patched in version 1.23.0.",
"evidence": "osv:CVE-2026-46618",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-46618",
"aliases": [
"CVE-2026-46618",
"GHSA-7pjr-qpvh-m339",
"GO-2026-5230"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/fission/fission",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "710d8431bbbcdb82d7a1ac2b93c068baa829959b"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.23.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "710d8431bbbcdb82d7a1ac2b93c068baa829959b"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v1.23.0"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.23.0"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
"v1.22.0",
"v1.22.0-rc2",
"v1.22.0-rc1",
"v1.21.0",
"v1.21.0-rc2",
"v1.21.0-rc1",
"v1.20.5",
"v1.20.4",
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"v1.18.0-rc2",
"v1.18.0-rc1",
"v1.17.0",
"v1.17.0-rc2",
"v1.16.0",
"v1.17.0-rc1",
"v1.16.0-rc2",
"v1.16.0-rc1",
"v1.15.1",
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"v1.15.0-rc2",
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"1.8.0",
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"1.7.1",
"v1.7.0",
"1.7.0",
"v1.7.0-rc.2",
"1.7.0-rc.2",
"v1.7.0-rc.1",
"1.7.0-rc.1",
"v1.6.0",
"1.6.0",
"1.3.0",
"1.0-rc1",
"0.10.0",
"0.7.2",
"0.6.1",
"latest",
"0.6.0",
"0.4.1",
"0.4.0",
"0.4.0rc",
"0.3.0",
"0.3.0-rc",
"v0.2.1",
"v0.2.0-20170901",
"nightly20170705",
"nightly20170621",
"alpha20170124",
"kubecon"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46618.json"
}
}
],
"modified": "2026-10-28T02:30:42.081608591Z",
"provider": "osv",
"references": [
"https://github.com/fission/fission/releases/tag/v1.23.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46618.json",
"https://github.com/fission/fission/security/advisories/GHSA-7pjr-qpvh-m339",
"https://nvd.nist.gov/vuln/detail/CVE-2026-46618",
"https://github.com/fission/fission/pull/3364"
],
"provider_metadata": {
"cwe_ids": [
"CWE-250",
"CWE-269",
"CWE-78"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46618.json"
}
},
"related_cves": [
{
"value": "CVE-2026-46618",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 509978,
"published_at": "2026-06-10T17:20:53.216+00:00"
}