CVE-2026-28780
Publication date 5 May 2026
Last updated 18 June 2026
Ubuntu priority
Description
Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.
Why is this CVE low priority?
Apache httpd developers have rated this to be a low-severity issue
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| apache2 | 26.04 LTS resolute |
Fixed 2.4.66-2ubuntu2.1
|
| 25.10 questing |
Fixed 2.4.64-1ubuntu3.4
|
|
| 24.04 LTS noble |
Fixed 2.4.58-1ubuntu8.12
|
|
| 22.04 LTS jammy |
Fixed 2.4.52-1ubuntu4.20
|
|
| 20.04 LTS focal |
Fixed 2.4.41-4ubuntu3.23+esm4
|
|
| 18.04 LTS bionic |
Fixed 2.4.29-1ubuntu4.27+esm9
|
|
| 16.04 LTS xenial |
Fixed 2.4.18-2ubuntu3.17+esm18
|
|
| 14.04 LTS trusty |
Fixed 2.4.7-1ubuntu4.22+esm13
|
Get expanded security coverage with Ubuntu Pro
Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.
Get Ubuntu Pro 30-day free trialSeverity score breakdown
CVSS version: CVSS v3.0
Base score
9.8 · Critical
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8239-1
- Apache HTTP Server vulnerabilities
- 6 May 2026
- USN-8396-1
- Apache HTTP Server vulnerabilities
- 8 June 2026