High [CVE-2026-17106] Arbitrary file write via link following in tar extraction
This high-severity Red Hat Linux advisory covers CVE-2026-17106 affecting Confidential Compute Attestation, Cryostat 4, Kernel Module Management Operator for Red Hat Openshift.
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Summary
The tar extraction routines in moby/go-archive (Unpack, UnpackLayer, Untar/UntarUncompressed, and the ApplyLayer helpers) do not confine filesystem operations to the destination directory.
The extractor decides where each archive entry lands using lexical string checks and then performs the filesystem operation on a path that is resolved by the OS, so links introduced by the archive can be followed out of the destination directory.
An attacker who controls the contents of an archive can create or overwrite files at arbitrary paths writable by the extracting process. This could lead to unauthorized modification of system files or potentially arbitrary code execution.
Red Hat severity: Important — CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-59.
Affected products named by the advisory: Confidential Compute Attestation; Cryostat 4; Kernel Module Management Operator for Red Hat Openshift; Logging Subsystem for Red Hat OpenShift; and 21 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 29.7.0
- 5.4.0
- 0.38.0
- 0.3.0
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 29.7.0, 5.4.0, 0.38.0, 0.3.0. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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