CVE-2026-39395

medium Red Hat
CVSS v3 Base Score
6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS Score
0.0%
Exploitation probability in 30 days
Top 87% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Confidentiality
None
Integrity
High
Availability
None
Published: April 7, 2026 (93 days ago)
Last Modified: April 7, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in Cosign, a tool for code signing and transparency for containers and binaries. A remote attacker could exploit this vulnerability by providing malformed payloads or attestations with mismatched predicate types. This could lead to Cosign erroneously reporting a "Verified OK" result, even when the attestations are invalid. This issue compromises the integrity of the verification process, potentially allowing unverified software to be trusted.

CWE

CWE-347

Affected Products

OpenShift PipelinesOpenShift ServerlessRed Hat Advanced Cluster Security 4Red Hat Trusted Artifact SignerSecurity Profiles OperatorZero Trust Workload Identity ManagerZero Trust Workload Identity Manager - Tech Preview

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 github.com