CVE-2026-112269 SGLang through 0.5.22 Memory Exhaustion via Unauthenticated Mooncake Decode Registrations
Network-adjacent attackers can exhaust memory and crash the scheduler by sending unauthenticated registration messages to the Mooncake backend.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-112269?
CVE-2026-112269 is a high-severity denial of service vulnerability in sgl-project sglang, published on 19 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
SGLang through 0.5.22 with the Mooncake disaggregation backend accepts unauthenticated decode registration messages on the Prefill rank ZMQ PULL socket, allowing denial of service. Network-adjacent attackers can send many registrations with unique mooncake_session_id values and large nested-buffer frames to exhaust Prefill memory until the scheduler is OOM-killed.
Weakness: CWE-770
Which versions are affected by CVE-2026-112269?
How do I fix CVE-2026-112269?
No fix has been published for CVE-2026-112269 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-112269 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112269 exists.
Sources
Also known as GHSA-9qhw-7fv2-2hgm.