Is CVE-2026-39395 actively exploited?

No active exploitation of CVE-2026-39395 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-39395 be exploited remotely?

Yes. CVE-2026-39395 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-39395?

CVE-2026-39395 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-39395

CWE-754Published: April 7, 2026· Updated: Apr 8, 2026

4.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.2th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-39395 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.