NATS Server: Pre-auth server crash via double INFO in leafnode handshake
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.
BIT-nats-2026-58250
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:BIT-nats-2026-58250
nats
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 2.11.17
Source reference:
/affected/0/ranges2.12.8Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.11.17"
},
{
"introduced": "2.12.0"
},
{
"fixed": "2.12.8"
}
]
}
],
"package": {
"name": "nats",
"purl": "pkg:bitnami/nats",
"ecosystem": "Bitnami"
},
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"database_specific": {
"source": "https://github.com/bitnami/vulndb/tree/main/data/nats/BIT-nats-2026-58250.json"
}
}
]- Related CVEs
- CVE-2026-58250
Source reference:
/aliases
Publisher severity
high
Source reference: /database_specific/severity
- Event
- #25942 · Revision 1
- Added to Heist Feed
- Publisher date