Vulnerability 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.
CVSS Score
5.3
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Exim | Exim | >= 4.88, < 4.99.4 |
Related Weaknesses (CWE)
References
- https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1Vendor Advisory
- https://www.openwall.com/lists/oss-security/2026/05/29/3Mailing ListMitigationThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/05/29/3Mailing ListMitigationThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2026/06/msg00004.html
FAQ
What is CVE-2026-48840?
CVE-2026-48840 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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.
How severe is CVE-2026-48840?
CVE-2026-48840 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48840?
Check the references section above for vendor advisories and patch information. Affected products include: Exim Exim.