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Critical 9.8Published May 5, 2026

CVE-2026-28780Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()

Updated under an hour ago ()

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It affects Apache Software Foundation Apache HTTP Server and 9 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS
9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-122, CWE-787
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
apache
NVD analysis
Modified
Record last updated
Sep 14, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
Apache Software Foundation Apache HTTP Server
apache_software_foundation:apache_http_server (from the name)
through 2.4.66
CNA record
Red Hat JBoss Core Services for RHEL 8
redhat:jboss_core_services
from 0:2.4.62-13.el8jbcs not affected
CISA ADP
from 0:2.4.63-13.el10_2.1 not affected
CISA ADP
from 0:2.4.63-1.el10_0.4 not affected
CISA ADP
from 8040020260702193120.522a0ee4 not affected
CISA ADP
from 8040020260702193120.522a0ee4 not affected
CISA ADP
from 8080020260702200145.63b34585 not affected
CISA ADP
from 8080020260702200145.63b34585 not affected
CISA ADP
from 0:2.4.62-4.el9_6.6 not affected
CISA ADP
apache http_server
apache:http_server
before 2.4.67
NVD

References

References

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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