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

EPSS: 0.004 (62.6th percentile) — read the EPSS interpretation.

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.

Affected products

Lmsys Sglang — versions 0.5.10
Sglang — versions 5.10

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

cret@cert.org (Product)
cret@cert.org (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.