Deserialization in Lmsys Sglang
CVE-2026-3059
SGLang's multimodal generation module is vulnerable to unauthenticated remote code execution through the ZMQ broker, which deserializes untrusted data using pickle.loads() without authentication.
Vulnerability class: Insecure Deserialization
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: 0.016 (75.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.016 · change: +0.002
Affected products
- Lmsys Sglang
- Sglang — versions 0.5.10
Weakness classification (CWE)
References
- github.com/sgl-project/sglang/security/advisories/GHSA-3cp7-c6q2-94xr (Broken Link)
- github.com/sgl-project/sglang/blob/main/python/sglang/multimodal_gen/runtime/sc… (Product)
- orca.security/resources/blog/sglang-llm-framework-rce-vulnerabilities/ (Exploit, Third Party Advisory, Mitigation)
- github.com/sgl-project/sglang/pull/20904
- github.com/sgl-project/sglang/releases/tag/v0.5.10
Frequently asked questions
- What is CVE-2026-3059?
- CVE-2026-3059 is a critical-severity vulnerability in Lmsys Sglang, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-03-12.
- How severe is CVE-2026-3059?
- Critical severity. CVSS v3 base score is 9.8 out of 10.