CVE-2026-39395

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Source
https://cve.org/CVERecord?id=CVE-2026-39395
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39395.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-39395
Aliases
Downstream
Related
Published
2026-04-07T20:06:28.798Z
Modified
2026-07-15T01:49:01.295855645Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N CVSS Calculator
Summary
Cosign's verify-blob-attestation reports false positive when payload parsing fails
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-754"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39395.json"
}
References

Affected packages

Git / github.com/sigstore/cosign

Affected ranges

Type
GIT
Repo
https://github.com/sigstore/cosign
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
fecddd3c22045a39f52392e71e79f66854b41352
Introduced
9b4b74c497119b5c28b6ca60e9c1ff15bbd7164a
Fixed
f1ad3ee952313be5d74a49d67ba0aa8d0d5e351f
Database specific 
{
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:sigstore:cosign:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.6.3"
        },
        {
            "introduced": "3.0.0"
        },
        {
            "fixed": "3.0.6"
        }
    ]
}

Affected versions

cosigned-v0.*
cosigned-v0.0.1-dev
cosigned-v0.0.2-dev
cosigned-v0.0.3-dev
v0.*
v0.1.0
v0.2.0
v0.3.0
v0.3.1
v0.4.0
v0.5.0
v0.6.0
v1.*
v1.0.0
v1.0.1
v1.1.0
v1.10.0
v1.10.0-rc.1
v1.10.1
v1.11.0
v1.11.1
v1.12.0
v1.12.1
v1.13.0
v1.13.1
v1.2.0
v1.2.1
v1.3.0
v1.3.1
v1.4.0
v1.4.1
v1.5.0
v1.5.1
v1.6.0
v1.7.0
v1.7.1
v1.7.2
v1.8.0
v1.9.0
v2.*
v2.0.0
v2.0.0-rc.0
v2.0.0-rc.1
v2.0.0-rc.2
v2.0.0-rc.3
v2.0.1
v2.0.2
v2.1.0
v2.1.1
v2.2.0
v2.2.1
v2.2.2
v2.2.3
v2.2.4
v2.3.0
v2.4.0
v2.4.1
v2.4.2
v2.4.3
v2.5.0
v2.5.1
v2.5.2
v2.5.3
v2.6.0
v2.6.1
v2.6.2
v3.*
v3.0.0
v3.0.1
v3.0.2
v3.0.3
v3.0.4
v3.0.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39395.json"