High severity7.5NVD Advisory· Published Mar 25, 2026· Updated Aug 14, 2026
CVE-2026-29785
CVE-2026-29785
Description
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the "leafnode" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/nats-io/nats-server/v2Go | < 2.11.14 | 2.11.14 |
github.com/nats-io/nats-server/v2Go | >= 2.12.0-RC.1, < 2.12.5 | 2.12.5 |
github.com/nats-io/nats-serverGo | >= 0 | — |
Affected products
39- osv-coords37 versionspkg:apk/chainguard/k3spkg:apk/chainguard/k3s-1.32pkg:apk/chainguard/k3s-1.33pkg:apk/chainguard/k3s-staticpkg:apk/chainguard/k3s-static-1.32pkg:apk/chainguard/k3s-static-1.33pkg:apk/chainguard/kinepkg:apk/chainguard/milvus-2.5pkg:apk/chainguard/natspkg:apk/chainguard/nats-fipspkg:apk/chainguard/nats-toppkg:apk/chainguard/nats-top-fipspkg:apk/chainguard/prometheus-nats-exporterpkg:apk/chainguard/prometheus-nats-exporter-fipspkg:apk/chainguard/rke2-runtime-1.33pkg:apk/chainguard/rke2-runtime-1.34pkg:apk/chainguard/rke2-runtime-1.35pkg:apk/chainguard/rke2-runtime-fips-1.33pkg:apk/chainguard/rke2-runtime-fips-1.34pkg:apk/chainguard/rke2-runtime-fips-1.35pkg:apk/chainguard/telegraf-1.37pkg:apk/wolfi/k3spkg:apk/wolfi/k3s-1.32pkg:apk/wolfi/k3s-1.33pkg:apk/wolfi/k3s-staticpkg:apk/wolfi/k3s-static-1.32pkg:apk/wolfi/k3s-static-1.33pkg:apk/wolfi/kinepkg:apk/wolfi/natspkg:apk/wolfi/nats-toppkg:apk/wolfi/prometheus-nats-exporterpkg:apk/wolfi/telegraf-1.37pkg:bitnami/natspkg:golang/github.com/nats-io/nats-serverpkg:golang/github.com/nats-io/nats-server/v2pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2016.0
< 1.35.2.1-r3+ 36 more
- (no CPE)range: < 1.35.2.1-r3
- (no CPE)range: < 1.32.13.1-r5
- (no CPE)range: < 1.33.9.1-r5
- (no CPE)range: < 1.35.2.1-r3
- (no CPE)range: < 1.32.13.1-r5
- (no CPE)range: < 1.33.9.1-r5
- (no CPE)range: < 0.14.15-r0
- (no CPE)range: < 2.5.27-r4
- (no CPE)range: < 0.3.2-r0
- (no CPE)range: < 0.3.2-r0
- (no CPE)range: < 0.6.3-r17
- (no CPE)range: < 0.6.3-r15
- (no CPE)range: < 0.19.1-r3
- (no CPE)range: < 0.19.1-r3
- (no CPE)range: < 1.33.9.2.1-r2
- (no CPE)range: < 1.34.5.2.1-r2
- (no CPE)range: < 1.35.2.2.1-r2
- (no CPE)range: < 1.33.9.2.1-r2
- (no CPE)range: < 1.34.6.2.1-r1
- (no CPE)range: < 1.35.2.2.1-r1
- (no CPE)range: < 1.37.3-r5
- (no CPE)range: < 1.35.2.1-r3
- (no CPE)range: < 1.32.13.1-r5
- (no CPE)range: < 1.33.9.1-r5
- (no CPE)range: < 1.35.2.1-r3
- (no CPE)range: < 1.32.13.1-r5
- (no CPE)range: < 1.33.9.1-r5
- (no CPE)range: < 0.14.15-r0
- (no CPE)range: < 0.3.2-r0
- (no CPE)range: < 0.6.3-r17
- (no CPE)range: < 0.19.1-r3
- (no CPE)range: < 1.37.3-r5
- (no CPE)range: < 2.11.14
- (no CPE)range: >= 0
- (no CPE)range: < 2.11.14
- (no CPE)range: < 0.0.20260326T203309-150000.1.155.2
- (no CPE)range: < 0.0.20260723T184607-160000.1.1
- Range: < 2.11.14
Patches
Vulnerability mechanics
References
11- github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8nvdPatchWEB
- advisories.nats.io/CVE/secnote-2026-04.txtnvdMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-52jh-2xxh-pwh6ghsaADVISORY
- github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6nvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-29785ghsaADVISORY
- access.redhat.com/errata/RHSA-2026:21769nvd
- access.redhat.com/errata/RHSA-2026:22347nvd
- access.redhat.com/errata/RHSA-2026:23345nvd
- access.redhat.com/security/cve/CVE-2026-29785nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29785.jsonnvd
News mentions
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