CVE-2026-53508
Medium
Description
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.
SeverityMedium
CVSS6.0
Exploit probability—
ProductGithub.com/oasdiff/oasdiff
PublishedAug 31, 2026
First seenAug 31, 2026
How to fix
Update
- github.com/oasdiff/oasdiff1.18.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/oasdiff/oasdiffGo | 1.13.2 ≤ v < 1.18.1 | 1.18.1 |
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