JLSEC-2026-1121

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Source
https://github.com/JuliaLang/SecurityAdvisories.jl/blob/main/advisories/published/2026/JLSEC-2026-1121.md
Import Source
https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1121.json
JSON Data
https://api.osv.dev/v1/vulns/JLSEC-2026-1121
Upstream
Published
2026-08-03T19:08:57.739Z
Modified
2026-08-03T19:15:03.761954394Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Database specific 
{
    "sources": [
        {
            "database_specific": {
                "status": "Modified"
            },
            "modified": "2026-08-03T13:17:36.973Z",
            "published": "2026-03-25T20:16:27.210Z",
            "html_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27889",
            "id": "CVE-2026-27889",
            "imported": "2026-08-03T18:16:26.994Z",
            "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-27889"
        }
    ],
    "license": "CC-BY-4.0"
}
References

Affected packages

Julia / nats_server_jll

Package

Name
nats_server_jll
Purl
pkg:julia/nats_server_jll?uuid=8b1691f7-6002-537d-bdf7-c6203599dc08

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.14.3+0

Database specific

source 
"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1121.json"