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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-82416
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-13 17:17:47 UTC
Updated2026-10-16 20:04:29 UTC
DescriptionFrankenPHP 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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

EPSS: 0.002270000 probability, percentile 0.125650000 (date 2026-10-16)

Problem Types: CWE-362 | CWE-488 | CWE-362 CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') | CWE-488 CWE-488: Exposure of Data Element to Wrong Session

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Php Frankenphp affected < 1.12.5 Not specified

References

ReferenceSourceLinkTags
github.com/php/frankenphp/pull/2523 [email protected] github.com
github.com/php/frankenphp/releases/tag/caddy/v1.12.5 [email protected] github.com
github.com/php/frankenphp/commit/be24d82531675f90862b8cde1e9fc7e9ee855aa5 [email protected] github.com
github.com/php/frankenphp/security/advisories/GHSA-v3ph-cgqh-r8p5 [email protected] github.com
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