NULL pointer dereference in Linuxfoundation Nats-Server
CVE-2026-29785
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.010 (61.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.010 · change: +0.003
Affected products
- Linuxfoundation Nats-Server
- Nats-Io Nats-Server — versions < 2.11.14, >= 2.12.0-RC.1, < 2.12.5
Weakness classification (CWE)
References
- github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6 (Mitigation, Vendor Advisory)
- github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8 (Patch)
- advisories.nats.io/CVE/secnote-2026-04.txt (Mitigation, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-29785?
- CVE-2026-29785 is a high-severity vulnerability in Linuxfoundation Nats-Server, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-03-25.
- How severe is CVE-2026-29785?
- High severity. CVSS v3 base score is 7.5 out of 10.