CVE-2026-3059 CVE-2026-3059
Unauthenticated attackers can execute arbitrary code via unsafe pickle deserialization in the ZMQ broker of SGLang's multimodal generation module.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-3059?
CVE-2026-3059 is a critical unsafe deserialization vulnerability in SGLang, published on 12 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-502
Which versions are affected by CVE-2026-3059?
3 open source packages ship an affected version, including sglang. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
sglang PyPI | All versions | 0.5.10 |
sglang PyPI | All versions | 0.5.10 |
sglang PyPI | All versions | 0.5.10 |
Products include Lmsys Sglang.
How do I fix CVE-2026-3059?
Upgrade sglang to 0.5.10 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-3059 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3059 exists.
Other vulnerabilities in SGLang
Sources
Also known as GHSA-3cp7-c6q2-94xr, GHSA-rgq9-fqf5-fv58, PYSEC-2026-539.