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SCA: security update for github.com/sigstore/cosign (GHSA-w6c6-c85g-mmv6)

medium Tenable Self-Hosted Container Security Plugin ID 440001

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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.
 (CVE-2026-39395)

Solution

Update the github.com/sigstore/cosign library and its related packages to version 2.6.3 or later.

See Also

https://github.com/advisories/GHSA-w6c6-c85g-mmv6

Plugin Details

Severity: Medium

ID: 440001

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 4/8/2026

Updated: 5/27/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2026-39395

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 4/8/2026

Vulnerability Publication Date: 4/7/2026

Reference Information

CVE: CVE-2026-39395

cwe: CWE-754