What’s Vulnerable › Vulnerabilities

CVE-2026-48840

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-30 · updated 2026-07-22
• Weakness: CWE-839

Description

Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.

Affected products

• Exim: from 4.88 before 4.99.4 — fixed in 4.99.4

How to fix

Upgrade to a fixed version: Exim 4.99.4. Check the vendor advisory for mitigations.

References

• https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1
• https://www.openwall.com/lists/oss-security/2026/05/29/3
• http://www.openwall.com/lists/oss-security/2026/05/29/3
• https://lists.debian.org/debian-lts-announce/2026/06/msg00004.html

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