CVE-2026-115915: vLLM: Untrusted EPS inputs can trigger denial of service or Ghostscript RCE

In vLLM 0.30.0, ImageMediaIO passes attacker-controlled image bytes to Pillow’s format autodetection without restricting the accepted formats; the request’s MIME label does not constrain decoder selection. An EPS payload labeled image/png reached the host’s Ghostscript executable. On a host with Ghostscript affected by CVE-2024-29510, this exposes the known Ghostscript sandbox escape through vLLM’s image-loading path and can execute commands with the vLLM process’s privileges. A bounded marker-command payload executed through the PyPI wheel’s actual ImageMediaIO.load_base64() implementation using Debian Ghostscript 10.03.0. The loader-level execution is reproduced; the HTTP request path is source-traced but was not exercised end to end. This report concerns vLLM’s untrusted-format dispatch and does not claim a new Ghostscript vulnerability. Exploitation requires an image-capable request path, a caller able to reach it under the deployment’s authentication policy, and a vulnerable host Ghostscript build.