Vulnerability · Published Mar 24, 2026 · Assigned by GovTech CSG
CVE-2026-4751NULL Pointer Dereference in tmate-io tmate
Medium 5.3
In plain English
A medium-severity null pointer dereference in tmate from tmate-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 74.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
NULL Pointer Dereference vulnerability in tmate-io tmate.This issue affects tmate: before 2.4.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | tmate | no fix listed | DEBIAN-CVE-2026-4751 |
| Debian:13 | tmate | no fix listed | DEBIAN-CVE-2026-4751 |
| Debian:14 | tmate | 2.4.0-4.1 | DEBIAN-CVE-2026-4751 |
| Ubuntu:22.04:LTS | tmate | no fix listed | UBUNTU-CVE-2026-4751 |
| Ubuntu:24.04:LTS | tmate | no fix listed | UBUNTU-CVE-2026-4751 |
| Ubuntu:25.10 | tmate | no fix listed | UBUNTU-CVE-2026-4751 |
| Ubuntu:26.04:LTS | tmate | no fix listed | UBUNTU-CVE-2026-4751 |
| Ubuntu:26.10 | tmate | no fix listed | UBUNTU-CVE-2026-4751 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L