CVE-2026-53508
Description
A flaw was found in oasdiff, a tool used for comparing OpenAPI specifications. This vulnerability occurs when oasdiff loads a specification from a git revision, as it fails to properly enforce a setting that prevents the resolution of external references. An attacker could exploit this to force the system running oasdiff to make unauthorized requests to internal or external resources (Server-Side Request Forgery, or SSRF) or to read sensitive local files.
Statement
This vulnerability is rated as Important because processing untrusted specifications in automated CI/CD pipelines can lead to high-impact server-side request forgery or arbitrary local file disclosure, bypassing explicit external reference restrictions. In typical Red Hat build environments and automated analysis workflows, tools inspecting repository changes run with host or service-level credentials, meaning unauthorized network requests or file reads can compromise sensitive infrastructure. The flaw specifically affects git revision inputs where security controls intended to block remote and local references fail to apply, posing significant confidentiality risk despite requiring specific input formatting.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Access Control
Technical Impact: Bypass Protection Mechanism
By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
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