CVE-2026-28780
No exploitation reported by the sources we read.
- Published2026-05-05
- Fixed in2.4.67
- WeaknessCWE-122 · CWE-787
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2026-05-0522:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-28780?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-28780?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.4 | < 2.4.67 | 2.4.67 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- httpdAlmaLinux:10all versions · fixed in 2.4.63-13.el10_2.1and 8 other packages
- httpdAlmaLinux:9all versions · fixed in 2.4.62-13.el9_8.1and 8 other packages
- httpdAlmaLinux:8all versions · fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8and 6 other packages
- mod_http2AlmaLinux:8all versions · fixed in 1.15.7-10.module_el8.10.0+4185+0955a0d7.5
- mod_mdAlmaLinux:8all versions · fixed in 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2
- mod_sslAlmaLinux:10all versions · fixed in 1:2.4.63-13.el10_2.1and 1 other package
- mod_sslAlmaLinux:9all versions · fixed in 1:2.4.62-13.el9_8.1and 1 other package
- mod_sslAlmaLinux:8all versions · fixed in 1:2.4.37-65.module_el8.10.0+4185+0955a0d7.8and 1 other package
Fix
- Update Apache HTTP Server to 2.4.67
Advisories and patches
- httpd.apache.orgRelease Notes · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2026-05-05
- Last Modified
- 2026-09-14
- NVD status
- Modified
Frequently asked questions
What is CVE-2026-28780?
Is CVE-2026-28780 actively exploited?
What is the CVSS score for CVE-2026-28780?
Running Apache HTTP Server? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.