Use-After-Free Vulnerability in FrankenPHP by PHP
CVE-2026-128015

8.3HIGH

Key Information:

Vendor

PHP
Status
FrankenPHP
Vendor
CVE Published:
13 November 2026

What is CVE-2026-128015?

FrankenPHP versions before 1.13.4 are susceptible to a use-after-free vulnerability that can occur when the putenv() function is invoked during the request shutdown process. This vulnerability creates a dangling pointer to a freed environment table, which can be exploited by attackers using putenv() within shutdown functions, destructors, or session handlers. As a result, this may lead to process crashes on subsequent getenv() calls or could potentially leak environment values from previous requests, compromising the security of the application.

Affected Version(s)

frankenphp 0 < 1.13.4

frankenphp 1.13.4

References

https://github.com/php/frankenphp/security/advisories/GHS...
vendor-advisory
https://github.com/php/frankenphp/commit/ab174aa6c27738b9...
patch
https://www.vulncheck.com/advisories/frankenphp-before-1....
third-party-advisory

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
Low
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

atarus-security
.