Description
SGLang through 0.5.21 contains a decompression amplification vulnerability in load_audio that allows remote attackers to exhaust memory by submitting highly compressed audio decoded without duration or sample limits. Attackers can supply small FLAC-encoded silence files through audio_url or audio_data inputs that expand into massive PCM buffers, exhausting worker memory and CPU for denial of service.
References8
- github.com/sgl-project/sglang
- github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/mu…
- github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/mu…
- github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/ut…
- github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/ut…
- github.com/sgl-project/sglang/issues/43708
- www.vulncheck.com/advisories/sglang-through-0.5.21-audio-decomp…
- github.com/sgl-project/sglang/issues/43708
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 4.0
-
8.7
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 47 · as of 11 November 2026
- CWE
- CWE-409
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.