# CVE-2026-107174: Source-to-image: source-to-image: security boundary bypass via absolute symbolic link extraction

Status: published. Published: 2026-10-07. Updated: 2026-11-13.

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.

## Remediation

- 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. (source: CNA: redhat)

## Affected products and versions

-  /  (source-to-image): ≥ 0; ≤ 1.6.4 (affected, semver). Source: CNA: redhat
- Red Hat / OpenShift Serverless (openshift-serverless-1/kn-client-kn-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / OpenShift Serverless (openshift-serverless-1/kn-plugin-func-func-util-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / OpenShift Serverless (openshift-serverless-clients): Version range not reported. Source: CNA: redhat
- Red Hat / OpenShift Source-to-Image (S2I) (source-to-image/source-to-image-rhel8): Version range not reported. Source: CNA: redhat
- Red Hat / OpenShift Source-to-Image (S2I) (source-to-image/source-to-image-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift4/ose-docker-builder): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift4/ose-docker-builder-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 5 (openshift5/ose-docker-builder-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Web Terminal (web-terminal/web-terminal-tooling-rhel9): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.29% as of 2026-11-12; percentile 21.33%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-61

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-107174 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2547419 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-107174; retrieved 2026-11-13; source updated 2026-11-13

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-107174; retrieved 2026-11-13; source updated Not reported

Revision: ffe8b1fcd812b5977ff0981016068ce7c2ced65a9ed0afc35a944973f29f9398

Canonical: https://y2.dev/cve/CVE-2026-107174

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.