CVE-2026-48840
MEDIUMCVSS 5.3/10EPSS 0.26%
Last modified
CVE-2026-48840 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Exim | Exim | >= 4.88, < 4.99.4 |
References
- https://www.openwall.com/lists/oss-security/2026/05/29/3Mailing List, Mitigation, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/05/29/3Mailing List, Mitigation, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-48840?
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 a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.
How do I fix CVE-2026-48840?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-48840?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST