What is CVE-2026-7304?

CVE-2026-7304 is a critical-severity vulnerability in Lmsys Sglang, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-05-18.

How severe is CVE-2026-7304?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Lmsys Sglang

CVE-2026-7304

SGLangs multimodal generation runtime is vulnerable to unauthenticated remote code execution when the --enable-custom-logit-processor option is enabled, as Python objects loaded via dill.loads() will be deserialized without validation.

Vulnerability class: Insecure Deserialization

Published 2026-05-18 · last modified 2026-10-14.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.8th percentile), scored 2026-10-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.006 · change: -0.003

Affected products

Lmsys Sglang — versions 0.5.10
Sglang — versions 5.10

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

github.com/sgl-project/sglang/tree/main/python/sglang (Product)
antiproof.ai/blog/three-rces-in-sglang/ (Permissions Required)

Frequently asked questions

What is CVE-2026-7304?: CVE-2026-7304 is a critical-severity vulnerability in Lmsys Sglang, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-05-18.
How severe is CVE-2026-7304?: Critical severity. CVSS v3 base score is 9.8 out of 10.