CVE-2026-112270 SGLang through 0.5.22 Memory Exhaustion via Mooncake STAGING_RSP chunk_idx
Unauthenticated attackers can exhaust memory in SGLang's Mooncake backend by sending crafted messages, causing a denial of service.
- 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-2026-112270?
CVE-2026-112270 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 contains an uncontrolled memory allocation vulnerability in handle_staging_rsp() that lets unauthenticated network-adjacent attackers exhaust Prefill memory. Attackers can obtain the rank address from the /route endpoint and send STAGING_RSP messages with huge chunk_idx values under fresh room IDs, causing the scheduler to be OOM-killed.
Weakness: CWE-770
Which versions are affected by CVE-2026-112270?
How do I fix CVE-2026-112270?
No fix has been published for CVE-2026-112270 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-2026-112270 being exploited?
There is no known exploitation of CVE-2026-112270 in the wild and no public exploit code.
Sources
Also known as GHSA-q322-x26r-gm37.