DEBIAN-CVE-2026-39395
Cosign provides code signing and transparency for containers and binaries. Prior to 3.0.6 and 2.6.3, cosign verify-blob-attestation may erroneously report a "Verified OK" result for attestations with malformed payloads or mismatched predicate types. For old-format bundles and detached signatures, this was due to a logic flaw in the error handling of the predicate type validation. For new-format bundles, the predicate type validation was bypassed completely. This vulnerability is fixed in 3.0.6 and 2.6.3.
DEBIAN-CVE-2026-39395
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-39395
cosign
Source reference: /affected/0/package/name
- Affected versions
- 2.5.0-2
Source reference:
/affected/0/versions2.6.2-1Source reference:
/affected/0/versions2.6.2-1~exp0Source reference:
/affected/0/versions2.6.3-1Source reference:
/affected/0/versions3.0.5-1~exp0Source reference:
/affected/0/versions3.0.6-1Source reference:
/affected/0/versions3.0.6-1~exp0Source reference:
/affected/0/versions3.1.0-1~exp0Source reference:
/affected/0/versions3.1.1-1Source reference:
/affected/0/versions3.1.1-1~exp0Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
cosign
Source reference: /affected/1/package/name
- Affected versions
- 2.5.0-2
Source reference:
/affected/1/versions2.6.2-1Source reference:
/affected/1/versions2.6.2-1~exp0Source reference:
/affected/1/versions - Fixed versions
- 2.6.3-1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "cosign",
"purl": "pkg:deb/debian/cosign?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.5.0-2",
"2.6.2-1",
"2.6.2-1~exp0",
"2.6.3-1",
"3.0.5-1~exp0",
"3.0.6-1",
"3.0.6-1~exp0",
"3.1.0-1~exp0",
"3.1.1-1",
"3.1.1-1~exp0"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39395.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.6.3-1"
}
]
}
],
"package": {
"name": "cosign",
"purl": "pkg:deb/debian/cosign?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.5.0-2",
"2.6.2-1",
"2.6.2-1~exp0"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39395.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56860 · Revision 1
- Added to Heist Feed
- Publisher date