CVE-2026-109226 Details
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.
A decompression amplification vulnerability has been identified in SGLang versions through 0.5.21. This vulnerability resides in the 'load_audio' function, where remote attackers can exploit unbounded audio data processing. By sending highly compressed FLAC-encoded silence files through the 'audio_url' or 'audio_data' inputs, attackers can cause significant memory exhaustion. The absence of limits on duration and sample counts allows these small files to expand into massive PCM buffers, leading to a denial-of-service condition by exhausting worker memory and CPU resources.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 12, 2026CISA-ADP
Assessed Oct 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/sgl-project/sglang/issues/43708 | CISA-ADP | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/sgl-project/sglang | [email protected] | Vendor |
| https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/audio_from_video.py#L128 | [email protected] | Source CodeVendor |
| https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/processors/base_processor.py#L996 | [email protected] | Source CodeVendor |
| https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/utils/common.py#L1783 | [email protected] | Source CodeVendor |
| https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/utils/common.py#L1801-L1803 | [email protected] | Source CodeVendor |
| https://github.com/sgl-project/sglang/issues/43708 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/sglang-through-0.5.21-audio-decompression-amplification-via-load-audio | [email protected] | Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-409 | Improper Handling of Highly Compressed Data (Data Amplification) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| SGLang | <= 0.5.21 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 13, 2026 | CVE Modified | CISA-ADP |
| Oct 12, 2026 | New CVE Received | [email protected] |