Out-of-Bounds Write in FrankenPHP Affects PHP Applications
CVE-2026-128014

9.2CRITICAL

Key Information:

Vendor

PHP
Status
FrankenPHP
Vendor
CVE Published:
13 November 2026

What is CVE-2026-128014?

The FrankenPHP standalone static binaries before version 1.13.2 include a PHP Brotli extension that is linked with an outdated version of Brotli. This leads to an out-of-bounds write vulnerability in the decoder, potentially allowing unauthenticated remote attackers to exploit the flaw. By sending specially crafted data to applications that utilize the brotli_uncompress_add() function, attackers can crash the FrankenPHP process, which may result in memory disclosure and the possibility of executing arbitrary code.

Affected Version(s)

frankenphp 1.8.0 < 1.13.2

frankenphp 1.13.2

References

https://github.com/php/frankenphp/security/advisories/GHS...
vendor-advisory
https://www.vulncheck.com/advisories/frankenphp-1.8.0-bef...
third-party-advisory

CVSS V4

Score:
9.2
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

pilvar222
.