NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-27889 · CVE overview and exploitation status

EUVD-2026-15962

GHSA-pq2q-rcw4-3hr6

BIT-nats-2026-27889

GO-2026-4841

cve-program · CVE-2026-27889

• https://github.com/nats-io/nats-server/security/advisories/GHSA-pq2q-rcw4-3hr6
• https://advisories.nats.io/CVE/secnote-2026-03.txt

euvd · EUVD-2026-15962

• https://github.com/nats-io/nats-server/security/advisories/GHSA-pq2q-rcw4-3hr6
• https://advisories.nats.io/CVE/secnote-2026-03.txt

nvd · CVE-2026-27889

• https://advisories.nats.io/CVE/secnote-2026-03.txt
• https://github.com/nats-io/nats-server/security/advisories/GHSA-pq2q-rcw4-3hr6
• https://access.redhat.com/errata/RHSA-2026:21769
• https://access.redhat.com/errata/RHSA-2026:22347
• https://access.redhat.com/errata/RHSA-2026:23345
• https://access.redhat.com/security/cve/CVE-2026-27889
• https://bugzilla.redhat.com/show_bug.cgi?id=2451447
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27889.json

osv · GHSA-pq2q-rcw4-3hr6

• https://github.com/nats-io/nats-server/security/advisories/GHSA-pq2q-rcw4-3hr6
• https://nvd.nist.gov/vuln/detail/CVE-2026-27889
• https://advisories.nats.io/CVE/secnote-2026-03.txt
• https://github.com/nats-io/nats-server

osv · GO-2026-4841

• https://github.com/nats-io/nats-server/security/advisories/GHSA-pq2q-rcw4-3hr6
• https://advisories.nats.io/CVE/secnote-2026-03.txt

No related changes are available here.