Thumbor has HMAC validation bypass via multiple .replace() calls when removing URL signature
High-risk advisory
CVE-2026-53501
Summary
Thumbor has HMAC validation bypass via multiple .replace() calls when removing URL signature
Why it matters
GitHub has published a reviewed security advisory for thumbor. Prioritize it with other application dependency updates.
Operator check
Check whether thumbor is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.