CVE-2026-109225 SGLang through 0.5.21 Memory Exhaustion DoS via /v1/audio/transcriptions Upload
Unauthenticated attackers can crash SGLang servers by uploading oversized audio files, causing memory exhaustion and service denial.
- 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-2026-109225?
CVE-2026-109225 is a high-severity denial of service vulnerability in sgl-project sglang, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SGLang through 0.5.21 contains an unbounded memory allocation vulnerability that allows unauthenticated remote attackers to exhaust memory by uploading oversized files to /v1/audio/transcriptions. Attackers can send concurrent large multipart uploads, which are fully read into memory before validation, to crash the HTTP/tokenizer worker and deny service.
Weakness: CWE-770
Which versions are affected by CVE-2026-109225?
How do I fix CVE-2026-109225?
No fix has been published for CVE-2026-109225 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-2026-109225 being exploited?
There is no known exploitation of CVE-2026-109225 in the wild and no public exploit code.
Sources
Also known as GHSA-4fxq-6r94-mchm.