# CVE-2026-48840

## Summary

- **CVE ID:** CVE-2026-48840
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
- **CWE:** CWE-839
- **Published:** May 30, 2026
- **Last Modified:** Jun 5, 2026

## 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 — Exim (4.88)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 18.2

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._