CVE-2026-34355

Summary

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.

Affected Software

Weaknesses

• CWE-122: CWE-122 Heap-based Buffer Overflow

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2026/06/08/6

httpd: Apache HTTP Server: Buffer overflow in mod_proxy_html allows security bypass

Additional References

• https://access.redhat.com/security/cve/CVE-2026-34355
• https://bugzilla.redhat.com/show_bug.cgi?id=2486414
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34355.json
• https://access.redhat.com/errata/RHSA-2026:34109

References

• https://httpd.apache.org/security/vulnerabilities_24.html

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