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CVE-2026-53508

oasdiff does not enforce --allow-external-refs=false on the git-revision load path (SSRF / local file read)

oasdiff is a command-line and Go package that compares and detects breaking changes in OpenAPI specs. From version 1.13.2 through version 1.18.0, oasdiff did not enforce --allow-external-refs=false (library: openapi3.Loader.IsExternalRefsAllowed = false) when loading a spec from a git revision (the rev:path form, e.g. main:openapi.yaml). External $refs were resolved on that load path even when external refs were explicitly disabled, so the mitigation silently did not apply there. This issue has been patched in version 1.18.1.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Oasdiff
Products
Oasdiff
CVE-2026-53507

oasdiff actions resolve external $refs by default, enabling SSRF and disclosure of structured files on pull-request runs

oasdiff-action is a GitHub Action that detects breaking changes in OpenAPI specs and post a review on every pull request. Before version 0.0.51, the oasdiff actions resolved external $refs in the OpenAPI spec by default (allow-external-refs: true). When an action runs on a pull request whose spec is attacker-controlled — most importantly fork pull requests on public repositories — a $ref in that spec is fetched/read on the runner with no interaction required, enabling SSRF and disclosure of structured files on the runner. This issue has been patched in version 0.0.51.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Oasdiff
Products
Oasdiff-action