CVE-2026-92972 SGLang through 0.5.19 Unauthenticated Route Poisoning via PUT endpoint
Unauthenticated attackers can poison routing tables in SGLang's disaggregation mode, causing denial of service or leaking session metadata.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-92972?
CVE-2026-92972 is a high-severity missing authorization vulnerability in sgl-project sglang, published on 17 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 contains an unauthenticated PUT /route endpoint on the prefill bootstrap service that allows attackers to poison the KV transfer routing table. Attackers can supply arbitrary rank_ip and rank_port values to redirect decode workers to attacker-controlled endpoints, causing denial of service or disclosure of KV transfer metadata including session identifiers and tensor-parallel topology parameters.
Weakness: CWE-306
Which versions are affected by CVE-2026-92972?
How do I fix CVE-2026-92972?
No fix has been published for CVE-2026-92972 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-92972 being exploited?
There is no known exploitation of CVE-2026-92972 in the wild and no public exploit code.
Sources
Also known as GHSA-9hr3-qqwc-fxxh.