CVE-2026-94056 Information disclosure in Exim
Attackers can read uninitialized stack memory when Exim uses Proxy-Protocol with a malicious proxy, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-94056?
CVE-2026-94056 is a high-severity vulnerability in Exim Exim, published on 19 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-908
Which versions are affected by CVE-2026-94056?
It affects 1 product.
Products include Exim Exim.
How do I fix CVE-2026-94056?
Upgrade to a fixed version.
Is CVE-2026-94056 being exploited?
There is no known exploitation of CVE-2026-94056 in the wild and no public exploit code.
Other vulnerabilities in Exim Exim
Sources
Also known as CLSA-2026-1790608989, CLSA-2026-1790609038, CLSA-2026-1790870694, CLSA-2026-1791831177, DEBIAN-CVE-2026-94056, GHSA-xcfp-8rjq-j39w and 2 more.