oscal-compass Compliance-trestle up to 3.12.3/4.0.x URLSecurityValidator server-side request forgery

Summaryinfo

A vulnerability classified as critical has been found in oscal-compass Compliance-trestle up to 3.12.3/4.0.x. This affects the function URLSecurityValidator. This manipulation causes server-side request forgery. This vulnerability is registered as CVE-2026-52776. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in oscal-compass Compliance-trestle up to 3.12.3/4.0.x. It has been declared as critical. Affected by this vulnerability is the function URLSecurityValidator. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-52776 since 06/08/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 3.12.4 or 4.1.0 eliminates this vulnerability.

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Productinfo

Vendor

• oscal-compass

Name

• Compliance-trestle

Version

• 3.12.0
• 3.12.1
• 3.12.2
• 3.12.3
• 4.0

Website

• Product: https://github.com/oscal-compass/compliance-trestle/

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