EUVD-2026-11699
GHSA-vrm6-8vpv-qv8q
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (ce714d77-add3-4f53-aff5-83d477b104bb).
CVSS VectorVendor: ce714d77-add3-4f53-aff5-83d477b104bb
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4Blast Radius
ecosystem impact- 28 npm packages depend on undici (16 direct, 23 indirect)
Ecosystem-wide dependent count for version 7.0.0.
DescriptionCVE.org
The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive.
The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold.
AnalysisAI
Node.js undici WebSocket client denial-of-service via decompression bomb in permessage-deflate processing allows remote attackers to crash or hang affected processes through unbounded memory consumption. An attacker controlling a malicious WebSocket server can send specially crafted compressed frames that expand to extremely large sizes in memory without triggering any decompression limits. No patch is currently available for this vulnerability.
Technical ContextAI
The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to e
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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Same technique Denial Of Service
View allVendor StatusVendor
SUSE
Severity: High| Product | Status |
|---|---|
| SUSE Liberty Linux 10 | Fixed |
| SUSE Liberty Linux 8 | Fixed |
| SUSE Liberty Linux 9 | Fixed |
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External POC / Exploit Code
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