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Fencer Vulns
critical 9.8

CVE-2026-47767 json

Symfony: SymfonyRuntime CVE-2024-50340 Patch Bypass: Web Requests Can Still Set APP_ENV/APP_DEBUG via parse_str/SAPI Argv Mismatch

published 2026-06-09 5 mo ago modified 2026-09-10 1 mo ago also GHSA-fqc7-9xjw-jrh3 , EUVD-2026-44349

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 5.4.46 until 5.4.52, 6.4.40, 7.4.12, and 8.0.12, the CVE-2024-50340 fix gated runtime argv parsing on empty($_GET), but parse_str() and the web SAPI can disagree, allowing a crafted query string to leave $_GET empty while $_SERVER['argv'] still carries attacker-controlled --env or --no-debug flags that change APP_ENV or APP_DEBUG. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.

Patch / fix

  • packagist symfony/runtime 5.4.52, 6.4.40, 7.4.12, 8.0.12
  • packagist symfony/symfony 5.4.52, 6.4.40, 7.4.12, 8.0.12
  • sensiolabs symfony 5.4.52, 6.4.40, 7.4.12, 8.0.12
  • symfony Debian 12 5.4.52+dfsg-0+deb12u1
  • symfony Debian 13 6.4.41+dfsg-0+deb13u1
  • symfony Debian 14 7.4.12+dfsg-1

debian advisories DEBIAN-CVE-2026-47767

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 4.0 8.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/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 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist symfony/runtime
>=5.4.46, <5.4.52
>=6.4.14, <6.4.40
>=7.1.7, <7.4.12
>=8.0.0, <8.0.12
5.4.52
6.4.40
7.4.12
8.0.12
packagist symfony/symfony
>=5.4.46, <5.4.52
>=6.4.14, <6.4.40
>=7.1.7, <7.4.12
>=8.0.0, <8.0.12
5.4.52
6.4.40
7.4.12
8.0.12

Affected products

  • symfony symfony
  • symfony runtime

Classification

Weakness
  • CWE-436 Interpretation Conflict
  • CWE-20 Improper Input Validation
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

Fencer Vulns 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.