CVE-2026-48840
Publication date 29 May 2026
Last updated 6 June 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| exim4 | 26.04 LTS resolute |
Fixed 4.99.1-1ubuntu1.3
|
| 25.10 questing |
Fixed 4.98.2-1ubuntu2.3
|
|
| 24.04 LTS noble |
Fixed 4.97-4ubuntu4.6
|
|
| 22.04 LTS jammy |
Fixed 4.95-4ubuntu2.9
|
|
| 20.04 LTS focal |
Fixed 4.93-13ubuntu1.12+esm1
|
|
| 18.04 LTS bionic |
Fixed 4.90.1-1ubuntu1.10+esm6
|
|
| 16.04 LTS xenial |
Fixed 4.86.2-2ubuntu2.6+esm9
|
|
| 14.04 LTS trusty |
Not affected
|
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Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
5.3 · Medium
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-8353-1
- Exim vulnerability
- 1 June 2026
- USN-8382-1
- Exim vulnerabilities
- 3 June 2026