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PatchSiren cyber security CVE debrief

CVE-2026-34355 Apache CVE debrief

CVE-2026-34355 is a HIGH severity vulnerability in Apache HTTP Server 2.4.67 and earlier. The vulnerability is caused by a buffer overflow in mod_proxy_html, which allows an attack by an untrusted backend. The CVSS score is 7.5. Users are recommended to upgrade to version 2.4.68, which fixes this issue.

Vendor
Apache
Product
HTTP Server
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-09-10
Advisory published
2026-06-08
Advisory updated
2026-09-10

Who should care

Users of Apache HTTP Server 2.4.67 and earlier should upgrade to version 2.4.68 to fix this vulnerability.

Technical 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.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to Apache HTTP Server version 2.4.68 or later.

Evidence notes

The vulnerability is caused by a buffer overflow in mod_proxy_html, which allows an attack by an untrusted backend.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-34355 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-34355

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-34355 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-34355

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.