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Purlpkg:deb/debian/cosign@2.6.3-1
Typedeb
Namespacedebian
Namecosign
Version2.6.3-1
Qualifiers
Subpath
Is_vulnerablefalse
Next_non_vulnerable_versionnull
Latest_non_vulnerable_versionnull
Affected_by_vulnerabilities
Fixing_vulnerabilities
0
url VCID-8k12-ju2w-cygz
vulnerability_id VCID-8k12-ju2w-cygz
summary 
Cosign's verify-blob-attestation reports false positive when payload parsing fails
## Description

`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.

## Impact

When `cosign verify-blob-attestation` is used without `--check-claims` set to `true`, an attestation that has a valid signature but a malformed or unparsable payload would be incorrectly validated. Additionally, systems relying on `--type <predicate type>` to reject attestations with mismatched types would be lead to trust the unexpected attestation type.

## Patches

v3.0.6, v2.6.3

## Workarounds

Always set `--check-claims=true` for attestation verification.
references
0
reference_url https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-39395.json
reference_id
reference_type
scores
0
value 6.5
scoring_system cvssv3
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
url https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-39395.json
1
reference_url https://api.first.org/data/v1/epss?cve=CVE-2026-39395
reference_id
reference_type
scores
0
value 0.00029
scoring_system epss
scoring_elements 0.08216
published_at 2026-04-12T12:55:00Z
1
value 0.00029
scoring_system epss
scoring_elements 0.08236
published_at 2026-04-11T12:55:00Z
2
value 0.00029
scoring_system epss
scoring_elements 0.08246
published_at 2026-04-09T12:55:00Z
3
value 0.00029
scoring_system epss
scoring_elements 0.08227
published_at 2026-04-08T12:55:00Z
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value 0.00031
scoring_system epss
scoring_elements 0.08965
published_at 2026-04-13T12:55:00Z
5
value 0.00038
scoring_system epss
scoring_elements 0.11527
published_at 2026-04-21T12:55:00Z
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value 0.00038
scoring_system epss
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published_at 2026-04-18T12:55:00Z
url https://api.first.org/data/v1/epss?cve=CVE-2026-39395
2
reference_url https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
reference_id
reference_type
scores
0
value 6.5
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
url https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
3
reference_url https://github.com/sigstore/cosign
reference_id
reference_type
scores
0
value 4.3
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
1
value MODERATE
scoring_system generic_textual
scoring_elements
url https://github.com/sigstore/cosign
4
reference_url https://github.com/sigstore/cosign/security/advisories/GHSA-w6c6-c85g-mmv6
reference_id
reference_type
scores
0
value 4.3
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
1
value MODERATE
scoring_system generic_textual
scoring_elements
2
value Track
scoring_system ssvc
scoring_elements SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-08T15:49:08Z/
url https://github.com/sigstore/cosign/security/advisories/GHSA-w6c6-c85g-mmv6
5
reference_url https://nvd.nist.gov/vuln/detail/CVE-2026-39395
reference_id
reference_type
scores
0
value 4.3
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
1
value MODERATE
scoring_system generic_textual
scoring_elements
url https://nvd.nist.gov/vuln/detail/CVE-2026-39395
6
reference_url https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1133005
reference_id 1133005
reference_type
scores
url https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1133005
7
reference_url https://bugzilla.redhat.com/show_bug.cgi?id=2456254
reference_id 2456254
reference_type
scores
url https://bugzilla.redhat.com/show_bug.cgi?id=2456254
fixed_packages
0
url pkg:deb/debian/cosign@2.6.2-1
purl pkg:deb/debian/cosign@2.6.2-1
is_vulnerable true
affected_by_vulnerabilities
0
vulnerability VCID-8k12-ju2w-cygz
resource_url http://public2.vulnerablecode.io/packages/pkg:deb/debian/cosign@2.6.2-1
1
url pkg:deb/debian/cosign@2.6.3-1
purl pkg:deb/debian/cosign@2.6.3-1
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:deb/debian/cosign@2.6.3-1
aliases CVE-2026-39395, GHSA-w6c6-c85g-mmv6
risk_score 3.1
exploitability 0.5
weighted_severity 6.2
resource_url http://public2.vulnerablecode.io/vulnerabilities/VCID-8k12-ju2w-cygz
Risk_scorenull
Resource_urlhttp://public2.vulnerablecode.io/packages/pkg:deb/debian/cosign@2.6.3-1