CVE-2026-128014

FrankenPHP 1.8.0 before 1.13.2 Out-of-Bounds Write via Bundled Brotli Decoder

FrankenPHP standalone static binaries 1.8.0 before 1.13.2 bundle the PHP brotli extension statically linked with Brotli 1.2.0, whose decoder contains an out-of-bounds write (CVE-2026-111497). Unauthenticated remote attackers can send crafted data to applications that pass it to brotli_uncompress_add() to crash the entire FrankenPHP process, and possibly cause memory disclosure or code execution.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed

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Php

Products

Frankenphp

CVE-2026-128015

FrankenPHP before 1.13.4 Use-After-Free via putenv() During Request Shutdown

FrankenPHP before 1.13.4 contains a use-after-free vulnerability that leaves a dangling pointer to a freed environment table when putenv() is called during request shutdown. Attackers triggering putenv() in shutdown functions, destructors, or session handlers can crash the process on the next getenv() call or leak previous request environment values.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed

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Php

Products

Frankenphp

CVE-2026-128016

FrankenPHP before 1.13.4 Use-After-Free of SplTempFileObject Streams in Worker Mode

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.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed

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Php

Products

Frankenphp

CVE-2026-128017

FrankenPHP before 1.13.4 Double Free in Worker Mode via Non-Form POST

FrankenPHP before 1.13.4 contains a double free vulnerability in worker mode that frees SG(request_info).content_type_dup twice when a worker script ends its loop after a non-form POST request. Unauthenticated attackers can send repeated JSON POST requests until the worker loop ends, aborting the whole process when USE_ZEND_ALLOC=0 is set.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed

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Php

Products

Frankenphp

CVE-2026-128018

FrankenPHP before 1.13.4 Pending Worker Request Denial of Service

FrankenPHP before 1.13.4 contains a denial of service vulnerability in worker mode where frankenphp_handle_request() returns false without finishing the dequeued request after a fatal error during request startup. Attackers who trigger startup fatal errors against worker scripts that keep calling frankenphp_handle_request() can leave client requests hanging indefinitely while the worker continues running.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-128019

FrankenPHP before 1.13.4 Information Disclosure via Per-Request Environment Variable Leak

FrankenPHP before 1.13.4 contains an information disclosure vulnerability in worker mode that leaks per-request environment variables into later requests on the same PHP thread. Attackers can read values set via env directives with request placeholders or WithRequestEnv() through getenv() or $_SERVER, causing applications to act on another user's routing, tenant, or authorization values.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-128020

FrankenPHP before 1.13.2 Denial of Service via Cyclic Array Conversion

FrankenPHP before 1.13.2 contains an uncontrolled recursion vulnerability in its PHP-to-Go array converter that fails to detect circular references in PHP arrays. Passing a self-referential array to frankenphp_log() or returning one from a worker callback triggers a fatal Go stack overflow, terminating the entire server process.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-128021

FrankenPHP before 1.13.2 Information Disclosure via libxml Error State in Worker Mode

FrankenPHP before 1.13.2 contains an information disclosure vulnerability that allows later clients to read earlier clients' libxml errors because worker mode never resets LIBXML(error_list) between requests. Attackers sending requests to the same worker thread can call libxml_get_errors() or libxml_get_last_error() to obtain other clients' parsed-document fragments and server filesystem paths.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-128022

FrankenPHP before 1.13.2 Denial of Service via Queued Disconnected Requests

FrankenPHP before 1.13.2 contains a resource exhaustion vulnerability that allows unauthenticated clients to tie up PHP threads because queued requests are not cancelled when clients disconnect. Attackers can send many requests and close connections immediately, forcing handleRequestWithRegularPHPThreads and worker handlers to execute them and delay all clients sharing the thread pool.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-128023

FrankenPHP before 1.13.0 Authentication Bypass via Dot-Form Header Name Aliasing

FrankenPHP before 1.13.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to spoof trusted headers by sending dot-form header names that PHP rewrites to underscores. Attackers can send headers like X.Authenticated.User or X.Forwarded.For that map to $_SERVER keys, spoofing user identity, client IP, or scheme.

CVSS 4.0 · 9.1 Critical EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-128024

FrankenPHP before 1.13.0 Denial of Service via goArray Nil Type Assertion

FrankenPHP before 1.13.0 contains a denial of service vulnerability in goArray() that allows remote attackers to abort the server process via arrays with null integer-keyed elements. Attackers can send crafted JSON passed to frankenphp_log() or returned from worker callbacks, triggering an unrecovered cgo panic that terminates every vhost and in-flight request.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-128025

FrankenPHP before 1.13.0 CGI Path-Split Boundary Bypass via splitPos

FrankenPHP before 1.13.0 contains a path-split interpretation conflict in splitPos in cgi.go that allows unauthenticated attackers to execute protected PHP scripts by embedding .php inside a filename component. Attackers can request paths like /uploads/a.php.txt/b.php to execute uploads/a.php despite route-level or WAF deny rules and forge PATH_INFO, SCRIPT_NAME, and PHP_SELF values.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-128026

FrankenPHP 1.5.0 before 1.13.0 Cross-Request Environment Leakage via putenv

FrankenPHP from 1.5.0 before 1.13.0 contains an incomplete environment sandbox vulnerability in which putenv writes to the process-wide OS environment via os.Setenv, leaking values across concurrent requests. Attackers reaching a request path that spawns child processes with the default environment through proc_open or exec can read secrets such as database passwords set by other requests.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-128027

FrankenPHP before 1.1.11 Delayed Propagation of Base Image Security Fixes

FrankenPHP Docker images before 1.1.11 were rebuilt only when new base image tags were created, so security fixes that Alpine, PHP, and Go applied under existing tags were not propagated. Remote attackers could exploit known flaws in the stale system libraries, such as CVE-2025-15467 in libcrypto3, to execute code.

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-122233

FrankenPHP before 1.13.4 Cross-Request Response Header Leak in Worker Mode

FrankenPHP before 1.13.4 contains an information disclosure vulnerability in worker mode that fails to clear last HTTP stream response headers between requests, because the reset only happens in RSHUTDOWN, which worker requests skip. Later requests calling http_get_last_response_headers() can read headers fetched by earlier requests on the same worker thread, exposing other users' Set-Cookie or token headers from backend APIs.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-82416

FrankenPHP: Cross-request PHP session ID leak in worker mode when the session extension is a shared module

FrankenPHP is a modern application server for PHP. Prior to 1.12.5, FrankenPHP worker mode can retain PHP session state between requests when the session extension is loaded as a shared module and is unavailable through HAVE_PHP_SESSION at compile time. In this build configuration, frankenphp_reset_session_state() is compiled out, PS(id) can survive a request boundary, and a subsequent session_start() can ignore the new request's cookie because an identifier is already present. Under concurrent requests, session_id() can therefore return another client's identifier or a stale identifier from a previous request on the same worker thread, causing cross-user session exposure, possible session hijacking, and intermittent logout behavior. Builds with the session extension statically linked, including the official static binaries and Docker images, are not affected. This issue is fixed in version 1.12.5.

CVSS 3.1 · 7.7 High EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-85733

FrankenPHP: Docker images serve phpinfo() as the default index.php, leaking environment variables

FrankenPHP is a modern application server for PHP. Prior to 1.12.5, the official FrankenPHP Debian and Alpine Docker images include a default /app/public/index.php that executes phpinfo(). A derived image that does not overwrite this placeholder serves the diagnostics page in production and can disclose environment variables used for secrets, PHP configuration directives, loaded extensions, software versions, and system paths. Images built using the documented pattern with their own /app/public/index.php are not affected, and already derived images must be rebuilt or supplied with an application index to remove the exposed placeholder. This issue is fixed in version 1.12.5.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-45062

FrankenPHP: Unsafe Unicode Handling in CGI Path Splitting Allows Execution of Non-PHP Files

FrankenPHP is a modern application server for PHP. From version 1.11.2 to before version 1.12.3, the splitPos() function in cgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct flaws in that fallback let an attacker mislead FrankenPHP into treating a non-.php file as a .php script. In any deployment where the attacker can place content into a file served by FrankenPHP (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This issue has been patched in version 1.12.3.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed

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Php

Products

Frankenphp

CVE-2026-24894

FrankenPHP leaks session data between requests in worker mode

FrankenPHP is a modern application server for PHP. Prior to 1.11.2, when running FrankenPHP in worker mode, the $_SESSION superglobal is not correctly reset between requests. This allows a subsequent request processed by the same worker to access the $_SESSION data of the previous request (potentially belonging to a different user) before session_start() is called. This vulnerability is fixed in 1.11.2.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Php

Products

Frankenphp

CVE-2026-24895

FrankenPHP affected by Path Confusion via Unicode casing in CGI path splitting allows execution of arbitrary files

FrankenPHP is a modern application server for PHP. Prior to 1.11.2, FrankenPHP’s CGI path splitting logic improperly handles Unicode characters during case conversion. The logic computes the split index (for finding .php) on a lowercased copy of the request path but applies that byte index to the original path. Because strings.ToLower() in Go can increase the byte length of certain UTF-8 characters (e.g., Ⱥ expands when lowercased), the computed index may not align with the correct position in the original string. This results in an incorrect SCRIPT_NAME and SCRIPT_FILENAME, potentially causing FrankenPHP to execute a file other than the one intended by the URI. This vulnerability is fixed in 1.11.2.

CVSS 4.0 · 8.9 High EPSS < 1% KEV · Not listed

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Php

Products

Frankenphp