CVE-2026-28780
Publication date 5 May 2026
Last updated 14 May 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 |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
9.8 · Critical
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| 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