What is CVE-2026-5760?

CVE-2026-5760 is a critical-severity vulnerability in Lmsys Sglang, classified under Code Injection. CVSS score: 9.8/10. Published 2026-04-20.

How severe is CVE-2026-5760?

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

Is CVE-2026-5760 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Lmsys Sglang

CVE-2026-5760

SGLang's reranking endpoint (/v1/rerank) achieves Remote Code Execution (RCE) when a model file containing a malcious tokenizer.chat_template is loaded, as the Jinja2 chat templates are rendered using an unsandboxed jinja2.Environment().

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.006 (69.2th 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
Sglang — versions 8f3097e

Weakness classification (CWE)

CWE-94 — Code Injection

Public proof-of-concept exploits

Stuub/SGLang-0.5.9-RCE

References

cret@cert.org (Exploit, Third Party Advisory)
cret@cert.org (Patch, Issue Tracking)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-5760?: CVE-2026-5760 is a critical-severity vulnerability in Lmsys Sglang, classified under Code Injection. CVSS score: 9.8/10. Published 2026-04-20.
How severe is CVE-2026-5760?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-5760 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.