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

published 2026-10-26 19d ago modified 2026-11-13 2d ago also EUVD-2026-125087 , GHSA-rgpj-f2qx-xwhf

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository php/frankenphp. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 1

php frankenphp 1.13.4

github.com/php/frankenphp@ab174aa commit

Is CVE-2026-128015 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-14).

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.3	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
CNA	4.0	8.3	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	6.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Affected products

php frankenphp

Classification

Weakness

CWE-416 Use After Free

References

github.com /php/frankenphp/commit/ab174aa6c27738b9ee56c97ac276d152bfb38f5e
patch
github.com /php/frankenphp/security/advisories/GHSA-rgpj-f2qx-xwhf
vendor-advisory, advisory
vulncheck.com /advisories/frankenphp-before-1.13.4-use-after-free-via-putenv-during-request-shutdown
third-party-advisory

Sources

CVE List CVE-2026-128015
NVD CVE-2026-128015
Maintainer advisory GHSA-rgpj-f2qx-xwhf

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of php/frankenphp published their own advisory on GitHub. Reviewed sources take precedence over it.