CVE-2026-128016
Deferred Deferred - Pending Action

FrankenPHP Use-After-Free in Worker Mode

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
FrankenPHP before 1.13.4 contains a use-after-free vulnerability in worker mode that frees internal streams of SplTempFileObject or SplFileObject on php://temp instances surviving across requests. Remote clients can send requests reaching code that uses such persisted objects, causing reads of freed memory that leak garbage data or crash the process.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-128016
EUVD
EUVD-2026-125086

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
frankenphp frankenphp to 1.13.4 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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Executive Summary

FrankenPHP before 1.13.4 has a use-after-free vulnerability in worker mode. It incorrectly frees internal streams of SplTempFileObject or SplFileObject on php://temp instances that survive across requests. Remote clients can trigger this by sending requests that use these persisted objects, leading to reads of freed memory, garbage data leaks, or process crashes.

Detection Guidance

Detecting this vulnerability requires checking the FrankenPHP version in use. Run: frankenphp --version. If the version is below 1.13.4, the system is vulnerable. Additionally, monitor for crashes or memory corruption errors in worker mode logs that may indicate use-after-free issues.

Impact Analysis

This vulnerability can cause crashes, memory corruption, or exposure of sensitive data. Attackers may exploit it to leak information or disrupt services by sending malicious requests that interact with freed memory.

Mitigation Strategies

Upgrade FrankenPHP to version 1.13.4 or later immediately. If upgrading is not possible, avoid retaining SplTempFileObject or SplFileObject instances across requests in worker mode. Alternatively, call gc_collect_cycles() after each request to reduce risk.

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