CVE-2026-27571
nats-server websockets are vulnerable to pre-auth memory DoS
描述
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The WebSockets handling of NATS messages handles compressed messages via the WebSockets negotiated compression. Prior to versions 2.11.2 and 2.12.3, the implementation bound the memory size of a NATS message but did not independently bound the memory consumption of the memory stream when constructing a NATS message which might then fail validation for size reasons. An attacker can use a compression bomb to cause excessive memory consumption, often resulting in the operating system terminating the server process. The use of compression is negotiated before authentication, so this does not require valid NATS credentials to exploit. The fix, present in versions 2.11.2 and 2.12.3, was to bounds the decompression to fail once the message was too large, instead of continuing on. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points.
如何修補 CVE-2026-27571
要修補 CVE-2026-27571,請將受影響套件升級到下列已修補版本。
- —升級至 2.11.12 或更新版本
- —未列出修補版本
- —未列出修補版本
- —未列出修補版本
- —升級至 2.11.12 或更新版本
- —升級至 2.11.12 或更新版本
CVE-2026-27571 正在被利用嗎?
低 — EPSS 為 0.5%,目前沒有觀察到大規模利用活動。
受影響套件(6)
- from 0, < 2.11.12, >= 2.12.0, < 2.12.3
- from 0
- from 0, <= 1.4.1
- from 0
- from 0, < 2.11.12
- from 0, < 2.11.12, >= 2.12.0-RC.1, < 2.12.3
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |