CVE & CISA-KEV Catalog

CVE-2026-47767

CRITICAL
9.8
CVSS v3
NVD

Description

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.

CWE-436

How to fix

Remediation Available
symfonyDebian
Fixed in:5.4.52+dfsg-0+deb12u1CVE-2026-47767
Fixed in:6.4.41+dfsg-0+deb13u1CVE-2026-47767
Fixed in:7.4.12+dfsg-1CVE-2026-47767

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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

Exploit Intelligence

0.39%probability of exploitation in 30 days
32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Other references1

Related Vulnerabilities

Other CWE-436 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2026-63030Critical9.896%KEVFix
CVE-2025-25292Critical9.865%-Fix
CVE-2022-37436Medium5.358%-Fix
CVE-2021-28474High8.851%-Fix
CVE-2025-25291Critical9.820%-Fix
CVE-2019-17596High7.54.7%-Fix

Common questions

How do I fix CVE-2026-47767?

Upgrade symfony on debian 12 to 5.4.52+dfsg-0+deb12u1 or later.

Is CVE-2026-47767 being actively exploited?

Not that we know of. CVE-2026-47767 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.39% is the estimated probability that it will be exploited in the next 30 days. That is higher than 32% of all scored CVEs.

How severe is CVE-2026-47767?

CVE-2026-47767 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-47767 affect?

Published advisories record a fix for symfony (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-16.