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CVE-2026-52776

CVE-2026-52776 · Trestle URLSecurityValidator SSRF allowlist bypass via IPv4-mapped IPv6 and 0.0.0.0

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Compliance-trestle (Trestle) is a tooling platform for managing compliance as code. In versions before 3.12.4 and versions 4.0.0 through 4.0.3, the URLSecurityValidator that guards trestle's remote-fetch paths against server-side request forgery can be bypassed to reach loopback, link-local, cloud-metadata, and internal network endpoints it was designed to block. The blocklist does not canonicalize IPv4-mapped IPv6 literals such as [::ffff:169.254.169.254], which resolve to IPv6Address objects that never match the blocked IPv4 ranges, and it does not block the unspecified address 0.0.0.0, which routes to local services on Linux and inside containers. An attacker who can supply or influence an OSCAL artifact that trestle fetches, such as a malicious profile whose imports reference one of these bypass URLs, can cause the HTTPSFetcher and SFTPFetcher paths to contact cloud instance-metadata services, loopback interfaces, or internal hosts. This issue is fixed in versions 3.12.4 and 4.1.0.

CVSS 8.6 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • compliance-trestle

    Versions
    • < 3.12.4: Affected
    • >= 4.0.0, < 4.1.0: Affected

    No fix published

  • compliance-trestle PyPI

    Versions
    • 0.0.2
    • 0.0.3
    • 0.1.0
    • 0.1.1
    • 0.10.0
    • 0.11.0
    • 0.12.0
    • 0.13.0
    • 0.13.1
    • 0.14.0
    • 0.14.1
    • 0.14.2
    • 0.14.3
    • 0.14.4
    • 0.15.0
    • 0.15.1
    • 0.16.0
    • 0.17.0
    • 0.18.0
    • 0.18.1
    • 0.19.0
    • 0.2.0
    • 0.2.1
    • 0.2.2
    • 0.20.0
    • 0.21.0
    • 0.22.0
    • 0.22.1
    • 0.23.0
    • 0.24.0
    • 0.25.0
    • 0.25.1
    • 0.26.0
    • 0.27.0
    • 0.27.1
    • 0.27.2
    • 0.28.0
    • 0.28.1
    • 0.29.0
    • 0.3.0
    • 0.30.0
    • 0.31.0
    • 0.32.0
    • 0.32.1
    • 0.33.0
    • 0.34.0
    • 0.35.0
    • 0.36.0
    • 0.37.0
    • 0.4.0
    • 0.5.0
    • 0.6.0
    • 0.6.1
    • 0.6.2
    • 0.7.0
    • 0.7.1
    • 0.7.2
    • 0.8.0
    • 0.8.1
    • 0.9.0
    • 1.0.0rc0
    • 1.0.1
    • 1.0.2
    • 1.1.0
    • 1.2.0
    • 2.0.0
    • 2.1.0
    • 2.1.1
    • 2.2.0
    • 2.2.1
    • 2.3.0
    • 2.3.1
    • 2.4.0
    • 2.5.0
    • 2.5.1
    • 2.6.0
    • 2.6.1
    • 3.0.1
    • 3.1.0
    • 3.10.2
    • 3.10.3
    • 3.10.4
    • 3.11.0
    • 3.12.0
    • 3.12.1
    • 3.12.2
    • 3.12.3
    • 3.12.4
    • 3.2.0
    • 3.3.0
    • 3.4.0
    • 3.5.0
    • 3.6.0
    • 3.7.0
    • 3.8.0
    • 3.8.1
    • 3.9.0
    • 3.9.1
    • 3.9.2
    • 3.9.3
    • 4.0.0
    • 4.0.1
    • 4.0.2
    • 4.0.3
    Affected ranges
    • ECOSYSTEM: < 4.1.0

    Update to 4.1.0

Original sources

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