Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
| Date | Total | Labels |
|---|
| 2026-02-24 | 2 | Disclosure2 |
| 2026-02-25 | 1 | General1 |
| 2026-03-02 | 1 | Patch1 |
`NATS` `nats-server` websockets are vulnerable to pre-auth memory DoS (CVE-2026-27571). Patch to version 2.12.3 to mitigate. #NATS #DoS #Infosec https://www.pulsepatch.io/posts/cve-2026-27571-nats-server-websocket-memory-dos
Post summary
The NATS nats‑server websockets are vulnerable to a pre‑authentication memory DoS (CVE‑2026‑27571) and can be mitigated by upgrading to version 2.12.3.
CVE-2026-27571 NATS-Server is a High-Performance server for http://NATS.io, a cloud and edge native messaging system. The WebSockets handling of NATS messages handles compressed messages v… https://www.cve.org/CVERecord?id=CVE-2026-27571
Post summary
The text briefly mentions CVE-2026-27571 in the context of NATS‑Server’s WebSockets handling of compressed messages, but provides no further technical details, exploit information, or mitigation guidance.
CVE-2026-27571 WebSocket Compression Vulnerability in NATS-Server Leading to Memory Exhaustion https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-27571
Post summary
A new memory exhaustion vulnerability (CVE‑2026‑27571) affecting NATS‑Server’s WebSocket compression has been disclosed, but no PoC, exploit, patch, or active exploitation details are provided.
CVE-2026-27571: NATS-Server: The Decompression Doom Loop NATS-Server, the high-performance messaging system used as the nervous system for countless cloud-native architectures, contains a critical flaw in its WebSocket implementation. By failing to bo... https://cvereports.com/reports/CVE-2026-27571
Post summary
The report highlights a critical flaw in NATS-Server's WebSocket implementation but provides no PoC, exploit, patch, or evidence of active exploitation.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | linuxfoundation | nats-server | - | - | - |