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    CVE-2026-28780

    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.

    Published:May 5, 2026
    Last Modified:Sep 10, 2026
    EPS:May 5, 2026
    EPSS Score:0.01376
    CVSS Score:9.8

    Affected Products

    Vendor
    Apache
    Product
    Http Server

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-48913 (CVSS 7.3) — Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already exhausted. …
    CVE-2026-42536 (CVSS 7.5) — Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted…
    CVE-2026-44185 (CVSS 7.3) — Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled OCSP…
    CVE-2026-34355 (CVSS 7.5) — A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an untrusted …
    CVE-2026-44631 (CVSS 9.8) — Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. Th…
    CVE-2026-44119 (CVSS 5.5) — Improper Privilege Management vulnerability in Apache HTTP Server 2.4.67 and earlier allows local .htaccess au…
    CVE-2026-43951 (CVSS 6.5) — Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response lan…
    CVE-2026-42535 (CVSS 9.1) — A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to directly ma…
    CVE-2026-34356 (CVSS 7.5) — Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassRev…
    CVE-2026-44186 (CVSS 7.3) — Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache HTT…

    References

    https://httpd.apache.org/security/vulnerabilities_24.html
    http://www.openwall.com/lists/oss-security/2026/05/05/9
    https://access.redhat.com/errata/RHSA-2026:21391
    https://access.redhat.com/errata/RHSA-2026:21433
    https://access.redhat.com/errata/RHSA-2026:22140
    https://access.redhat.com/errata/RHSA-2026:27200
    https://access.redhat.com/errata/RHSA-2026:27201
    https://access.redhat.com/errata/RHSA-2026:36373
    https://access.redhat.com/errata/RHSA-2026:36831
    https://access.redhat.com/errata/RHSA-2026:36846
    https://access.redhat.com/errata/RHSA-2026:47046
    https://access.redhat.com/errata/RHSA-2026:62165
    https://access.redhat.com/errata/RHSA-2026:66323
    https://access.redhat.com/security/cve/CVE-2026-28780
    https://bugzilla.redhat.com/show_bug.cgi?id=2466913
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28780.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High