CVE-2026-45304
Last modified
CVE-2026-45304 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.76% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Sensiolabs | Symfony | < 5.4.52 |
| Sensiolabs | Symfony | >= 6.0.0, < 6.4.40 |
| Sensiolabs | Symfony | >= 7.0.0, < 7.4.12 |
| Sensiolabs | Symfony | >= 8.0.0, < 8.0.12 |
References
- https://github.com/symfony/symfony/releases/tag/v5.4.52Product, Release Notes
- https://github.com/symfony/symfony/releases/tag/v6.4.40Product, Release Notes
- https://github.com/symfony/symfony/releases/tag/v7.4.12Product, Release Notes
- https://github.com/symfony/symfony/releases/tag/v8.0.12Product, Release Notes
- https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-45304?
How severe is CVE-2026-45304?
How do I fix CVE-2026-45304?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-45299Open WebUI is a self-hosted artificial intelligence platform…5.4
- CVE-2026-4530A security flaw has been discovered in apconw Aix-DB up to 1…5.3
- CVE-2026-45300The AsyncHttpClient (AHC) library allows Java applications t…7.4
- CVE-2026-45301Open WebUI is a self-hosted artificial intelligence platform…8.1
- CVE-2026-45302parse-nested-form-data is a tiny node module for parsing For…8.2
- CVE-2026-45303Open WebUI is a self-hosted artificial intelligence platform…7.7
- CVE-2026-45305Symfony is a PHP framework for web and console applications …7.5
- CVE-2026-45306pyLoad is a free and open-source download manager written in…6.5
- CVE-2026-45307Speakr is a personal, self-hosted web application designed f…6.1
- CVE-2026-45309AsyncSSH is a Python package which provides an asynchronous …7.5
- CVE-2026-4531A weakness has been identified in Free5GC 4.1.0. Affected is…6.9
- CVE-2026-45310CodeWhale is a DeepSeek + MiMo coding agent in terminal. Pri…7.4
Are you affected by CVE-2026-45304?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST