CVE-2026-93688 SGLang through 0.5.19 Unbounded Memory Allocation via bootstrap_room
Unauthenticated attackers can exhaust memory in SGLang's prefill process by submitting arbitrary bootstrap_room values, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93688?
CVE-2026-93688 is a high-severity denial of service vulnerability in sgl-project sglang, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SGLang through 0.5.19 in prefill/decode disaggregation mode with Mooncake KV transfer backend fails to validate bootstrap_room values, allowing unbounded transfer state allocation. Unauthenticated attackers can reach the decode engine's POST /generate endpoint and submit arbitrary bootstrap_room values to exhaust prefill process memory until out-of-memory termination.
Weakness: CWE-770
Which versions are affected by CVE-2026-93688?
How do I fix CVE-2026-93688?
No fix published yet.
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-2026-93688 being exploited?
There is no known exploitation of CVE-2026-93688 in the wild and no public exploit code.
Sources
Also known as GHSA-hpqj-j2xw-q3cx.