CVE-2026-34356NVD

Vulnerability Summary

Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie*

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

Users are recommended to upgrade to version 2.4.68, which fixes the issue.

Severity Level

HIGH(7.5)

Published Date

Jun 8, 2026

Last Modified

Jul 23, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.71%Probability

Root Weakness (CWE)

CWE-122: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics — Score 7.5 (HIGH)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

ConfidentialityNone

IntegrityNone

AvailabilityHigh

Affected & Patched Versions

Affected Versions

Apache Http Server >= 2.4.0 and < 2.4.68

Patched Versions

Apache Http Server 2.4.68

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