What is CVE-2026-14890?

CVE-2026-14890 is a critical-severity vulnerability in Lmsys Sglang, classified under Deserialization of Untrusted Data. CVSS score: 9.1/10. Published 2026-07-16.

How severe is CVE-2026-14890?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Deserialization in Lmsys Sglang

CVE-2026-14890

SGLang uses an expert-parallel backup subsystem that exposes a ZeroMQ PULL socket on a routable network interface that does not contain authentication or deserialization safeguards, allowing an attacker to provide a malicious pickle file that results in unauthenticated remote code execution when the feature is enabled and the service is reachable over the network.

Vulnerability class: Insecure Deserialization

EPSS: 0.010 (59.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Lmsys Sglang
Sglang — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

cret@cert.org (Product)
cret@cert.org (Permissions Required)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2026-14890?: CVE-2026-14890 is a critical-severity vulnerability in Lmsys Sglang, classified under Deserialization of Untrusted Data. CVSS score: 9.1/10. Published 2026-07-16.
How severe is CVE-2026-14890?: Critical severity. CVSS v3 base score is 9.1 out of 10.