How severe is CVE-2026-4751?

CVE-2026-4751 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-4751 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-4751?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4751 have an EU (EUVD) identifier?

Yes. CVE-2026-4751 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14768.

When was CVE-2026-4751 published?

CVE-2026-4751 was published on 2026-03-24 and last updated on 2026-06-17.

CVE-2026-4751

CVE-2026-4751 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14768
Weakness: CWE-476
Published: 2026-03-24
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-4751?: NULL Pointer Dereference vulnerability in tmate-io tmate.This issue affects tmate: before 2.4.0.
How severe is CVE-2026-4751?: CVE-2026-4751 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-4751 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-4751?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4751 have an EU (EUVD) identifier?: Yes. CVE-2026-4751 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14768.
When was CVE-2026-4751 published?: CVE-2026-4751 was published on 2026-03-24 and last updated on 2026-06-17.

References

https://github.com/tmate-io/tmate/pull/328

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