Vulnerability in sgl-project sglang

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/sgl-project/sglang
• github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/audio_from_vide…
• github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/processors/base…
• github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/utils/common.py
• github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/utils/common.py
• github.com/sgl-project/sglang/issues/43708
• www.vulncheck.com/advisories/sglang-through-0.5.21-audio-decompression-amplification-vi…