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)
Published · last modified .
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: 0.009 (58.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.009 · change: -0.003
Affected products
- Lmsys Sglang
- Sglang — versions 8f3097e
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/Stuub/SGLang-0.5.9-RCE (Exploit, Third Party Advisory)
- github.com/sgl-project/sglang/pull/23660 (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.