NULL Pointer Dereference in tmate-io tmate

published 2026-03-24 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-14768

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits: 0; none known

NULL Pointer Dereference vulnerability in tmate-io tmate.This issue affects tmate: before 2.4.0.

Patch / fix

distros 1 links 1

tmate Debian 14 2.4.0-4.1

debian advisories DEBIAN-CVE-2026-4751

github.com/tmate-io/tmate#328 pull request

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-4751 updated 2026-06-28 cvss 5.3

tmate: tmate-io tmate: Denial of Service via NULL Pointer Dereference

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 7 mo ago (2026-03-24)

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

tmate-io tmate

Classification

Weakness

CWE-476 NULL Pointer Dereference

References

github.com /tmate-io/tmate/pull/328
patch

Sources

CVE List CVE-2026-4751
NVD CVE-2026-4751

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary