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Advisory record · GHSA-v3ph-cgqh-r8p5

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

CVSS 7.7 HighEPSS 0.0029 · 21st percentile

Published by the GitHub Advisory Database at 15 Oct 2026, 20:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/dunglas/frankenphpGo<1.12.51.12.5
Identifiers
GHSA-v3ph-cgqh-r8p5 · CVE-2026-82416 · GO-2026-6797
Weakness (CWE)
CWE-362 · CWE-488
Tags
Published
15 Oct 2026
Updated
19 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Affected: github.com/dunglas/frankenphp versions before 1.12.5, when PHP's session extension is loaded as a shared module rather than statically compiled in (for example, RPM and Debian packages). In worker mode under concurrent load, a request can receive another client's session ID or a stale one from a prior request, enabling cross-user session exposure and hijacking. Upgrade to 1.12.5. Statically linked builds, such as the official binaries and Docker images, are not affected.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.7 High 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0029, the 21st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:11 UTC First seen by agentprime
  2. 31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.