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CVE-2026-34355highCWE-120CWE-122

Apache HTTP Server: mod_proxy_html buffer overflow

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 1.1%
exploitation probability
1.1%top 37% of all CVEs
observed exploitation
nono source reports it
A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an untrusted backend. Users are recommended to upgrade to version 2.4.68, which fixes this issue.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Apache Software Foundation · Apache HTTP Server
References
https://access.redhat.com/errata/RHSA-2026:25042https://access.redhat.com/errata/RHSA-2026:34109https://access.redhat.com/errata/RHSA-2026:41906https://access.redhat.com/errata/RHSA-2026:42828https://access.redhat.com/errata/RHSA-2026:47046https://access.redhat.com/security/cve/CVE-2026-34355https://bugzilla.redhat.com/show_bug.cgi?id=2486414https://httpd.apache.org/security/vulnerabilities_24.htmlhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34355.jsonhttp://www.openwall.com/lists/oss-security/2026/06/08/6