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Back to active CVEs
Medium · CVSS 6.4CVE-2026-107174

Source-to-image: source-to-image: security boundary bypass via absolute symbolic link extractionCVE-2026-107174

Answer in brief

CVE-2026-107174 records a Medium severity (CVSS 6.4) vulnerability in Source-to-image: source-to-image: security boundary bypass via absolute symbolic link extraction. The current sources do not mark it as known exploited. The current feed maps Red Hat/openshift4/ose-docker-builder (generic), Red Hat/openshift4/ose-docker-builder-rhel9 (generic), Red Hat/openshift-serverless-1/kn-client-kn-rhel9 (generic), Red Hat/openshift-serverless-1/kn-plugin-func-func-util-rhel9 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 7, 2026Updated Oct 7, 2026Source checked Oct 7, 2026First seen by HOL Oct 7, 2026Material review Oct 7, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.4
Exploitation
Not marked as known exploited
Affected software
8 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/openshift4/ose-docker-builder (generic), Red Hat/openshift4/ose-docker-builder-rhel9 (generic), Red Hat/openshift-serverless-1/kn-client-kn-rhel9 (generic), Red Hat/openshift-serverless-1/kn-plugin-func-func-util-rhel9 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/openshift4/ose-docker-buildergeneric*Not reported
Red Hat/openshift4/ose-docker-builder-rhel9generic*Not reported
Red Hat/openshift-serverless-1/kn-client-kn-rhel9generic*Not reported
Red Hat/openshift-serverless-1/kn-plugin-func-func-util-rhel9generic*Not reported
Red Hat/openshift-serverless-clientsgeneric*Not reported
Red Hat/source-to-image/source-to-image-rhel8generic*Not reported
Red Hat/source-to-image/source-to-image-rhel9generic*Not reported
Red Hat/web-terminal/web-terminal-tooling-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/openshift4/ose-docker-builder, Red Hat/openshift4/ose-docker-builder-rhel9, Red Hat/openshift-serverless-1/kn-client-kn-rhel9.
  2. 2Review the reported fix. Source-reported workaround: Treat s2i builder images and application source as trusted inputs. Do not run s2i-based builds against builder images or repositories you do not control or have not verified. Where possible, run builds on isolated build nodes and restrict who can trigger builds or change BuildConfig and image stream references that point at custom builder images. There is no configuration option to disable only this symlink extraction behavior without changing how builds are performed. Apply updated source-to-image packages or rebuilt platform images when Red Hat publishes them for your product and stream.

Evidence timeline and material changes

  1. Published upstream

    Oct 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 7, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in source-to-image. When unpacking archive files, the application fails to properly sanitize symbolic links pointing to absolute file paths. An attacker who supplies a malicious builder image can exploit this vulnerability by embedding links pointing outside the extraction directory. This allows the attacker to bypass sandbox boundaries, potentially leading to unauthorized information disclosure or file modification on the host system.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • ImageMagick: Policy Bypass in delegate symlink cleanup due to missing checkAlso CWE-61
  • Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.ymlSame generic ecosystem
  • Backstage: Configuration bypass in TechDocs mkdocs.yml sanitizationSame generic ecosystem
  • Backstage: Improper validation of TechDocs MkDocs configurationSame generic ecosystem
  • Backstage: Improper input validation in Confluence to Markdown scaffolder moduleSame generic ecosystem
  • Backstage: Improper repository path validation in a Scaffolder backend moduleSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-61
Source
CVE List V5
Source checked
Oct 7, 2026
References
2 linked sources
Open source record