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CVE-2026-28780

CRITICAL
9.8
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-28780
State
PUBLISHED
Assigner
apache
Reserved
2026-03-03 12:31 UTC
Published
2026-05-05 21:29 UTC
Last updated
2026-07-28 12:04 UTC
Primary CWE
CWE-122
CWE-122 Heap-based Buffer Overflow
Vendor / Product
Apache Software Foundation / Apache HTTP Server
Sources
cve.org  ·  NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
Apache Software Foundation Apache HTTP Server — 0 ≤ 2.4.66
Weakness (CWE)
CWESourceDescription
CWE-122 cna CWE-122 Heap-based Buffer Overflow
CWE-787 adp Out-of-bounds Write
CVSS scores (2)
ScoreSeverityVersionSourceVector
9.8 CRITICAL 3.1 adp CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1 HIGH 3.1 adp CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References (1)
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