CVE-2026-115924: Rembg: Unauthenticated SAM model injection permits local-file disclosure through malicious ONNX graphs

The public /api/remove endpoint uses attacker-controlled extras.sam_model in both SAM filenames and GitHub download URLs. Path traversal plus a URL fragment lets an unauthenticated attacker place malicious ONNX models beside a target file. The models read the file as ONNX external data and encode its bytes into the returned PNG.

This issue affects SAM’s sam_model in 2.0.81 and returns complete file contents.

Screenshot 1 — First unauthenticated request primes the path and returns HTTP 500.