CVE-2026-45304Patch(sensiolabs / symfony)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch sensiolabs symfony systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\Component\Yaml\Parser resolved YAML collection aliases recursively, allowing a small untrusted YAML input to expand into a multi-gigabyte structure and exhaust memory. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.

sensiolabs CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Patch / fix

Other references

Weakness type (CWE)

CWE-776

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

symfony

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Affected systems

Vendors

sensiolabs

Products

symfony

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Full discourse1 post

DFIR Lab@DFIR_Lab91d
Patch
🚨 HIGH severity CVE-2026-45304 (CVSS 7.5) affects Symfony PHP framework. YAML parser vulnerability allows memory exhaustion via recursive alias expansion. Versions <5.4.52, <6.4.40, <7.4.12, <8.0.12 affected. Patch immediately. #CVE #Vulnerability #PatchNow https://t.co/vQhPy2wyDe
Post summary
The tweet alerts to a high‑severity CVE-2026-45304 in Symfony’s YAML parser, details affected versions and a memory exhaustion vulnerability, and urges users to patch immediately. No PoC, exploit, or active exploitation is mentioned.
0000040
80 followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	sensiolabs	symfony	-	-	-

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