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Withdrawn: CLEANSTART-2026-EM47790 — Security fixes in tkn 0.42.2-r1

Withdrawn by the publisher.

Affected: CleanStart: tkn

Package tkn version 0.42.2-r1 fixes 57 vulnerabilities: CVE-2025-15558, CVE-2026-34040, CVE-2026-33997, CVE-2025-69725, CVE-2026-34986...

EUVD-2026-338588

fkie_cve-2026-49834

sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N>1) or WithSignedCertificateTimestamps(N>1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0.

GHSA-9vcr-p3rj-q5q6 — sigstore-go has a multi-log threshold bypass via single compromised log

Affected: Go: github.com/sigstore/sigstore-go

### Impact _What kind of vulnerability is it? Who is impacted?_

A verifier configured with WithTransparencyLog(N>1) or WithSignedCertificateTimestamps(N>1) expected defense-in-depth against the compromise of a single log instance. However, threshold counting counted verified witnesses per-entry or per-validation-path rather than per-log-authority.

As a result, a single compromised transparency log could forge multiple entries with different indices, and a single compromised CT log could verify multiple times (either across multiple certificate chains or via multiple embedded SCTs), fully satisfying the multi-log threshold requirements and defeating the multi-log policy.

Note that this does not affect Cosign, as Cosign sets a threshold of 1.

### Patches _Has the problem been patched? What versions should users upgrade to?_

Upgrade to v1.1.5.

### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_

There is no workaround, beyond relying on trusted logs.

RHSA-2026:44162 — Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

github.com/sigstore/sigstore-go: sigstore-go: Security Policy Bypass via Compromised Log github.com/sigstore/sigstore-go: sigstore-go: Signature bypass allows acceptance of bundles signed with expired keys golang.org/x/text: golang.org/x/text: Denial of Service via invalid UTF-8 input

UBUNTU-CVE-2026-49834

Affected: Ubuntu:Pro:26.04:LTS: sigstore-go