What is CVE-2026-94056?

CVE-2026-94056 is a high-severity vulnerability in Exim, classified under Use of Uninitialized Resource. CVSS score: 7.5/10. Published 2026-09-19.

How severe is CVE-2026-94056?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Exim

CVE-2026-94056

Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, allows attackers to read certain uninitialized data from stack memory.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L.

Affected products

Exim

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-94056?: CVE-2026-94056 is a high-severity vulnerability in Exim, classified under Use of Uninitialized Resource. CVSS score: 7.5/10. Published 2026-09-19.
How severe is CVE-2026-94056?: High severity. CVSS v3 base score is 7.5 out of 10.