Improper Verification of Source of a Communication Channel Affecting php8.4-common package, versions <0:8.4.26-1.amzn2023.0.1


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.56% (45th percentile)

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  • Snyk IDSNYK-AMZN2023-PHP84COMMON-20850957
  • published13 Oct 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

NewCVE-2026-91768  (opens in a new tab)
CWE-940  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 php8.4-common to version 0:8.4.26-1.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2026-3163.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php8.4-common package and not the php8.4-common package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so listen.allowed_clients matches on a /96 prefix instead of the exact address. An attacker who can source an address sharing the first 96 bits with an allowed one passes the check and reaches the FastCGI endpoint.

CVSS Base Scores

version 3.1