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CVE-2026-45304
8.7 HIGH
- CVSS version (CVSS): 4.0
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Attack Requirement (AT): None (N)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Vulnerable System Impact Confidentiality (VC): None (N)
- Vulnerable System Impact Integrity (VI): None (N)
- Vulnerable System Impact Availability (VA): High (H)
- Subsequent System Impact Confidentiality (SC): None (N)
- Subsequent System Impact Integrity (SI): None (N)
- Subsequent System Impact Availability (SA): None (N)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Attack Requirement (MAT): None (N)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Vulnerable System Impact Confidentiality (MVC): None (N)
- Modified Vulnerable System Impact Integrity (MVI): None (N)
- Modified Vulnerable System Impact Availability (MVA): High (H)
- Modified Subsequent System Impact Confidentiality (MSC): Negligible (N)
- Modified Subsequent System Impact Integrity (MSI): Negligible (N)
- Modified Subsequent System Impact Availability (MSA): Negligible (N)
- Safety (S): Not Defined (X)
- Automatable (AU): Not Defined (X)
- Recovery (R): Not Defined (X)
- Value Density (V): Not Defined (X)
- Vulnerability Response Effort (RE): Not Defined (X)
- Provider Urgency (U): Not Defined (X)
- Confidentiality Req. (CR): Not Defined (X)
- Integrity Req. (IR): Not Defined (X)
- Availability Req. (AR): Not Defined (X)
- Exploit Maturity (E): Not Defined (X)
Activity log
- Created & dismissed (max. allowed matches exceeded) suggestion
Symfony: YAML Parser Exponential Memory Allocation via Recursive Collection-Alias Expansion ("Billion Laughs")
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.
References
-
https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4 x_refsource_CONFIRM
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https://github.com/symfony/symfony/releases/tag/v5.4.52 x_refsource_MISC
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https://github.com/symfony/symfony/releases/tag/v6.4.40 x_refsource_MISC
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https://github.com/symfony/symfony/releases/tag/v7.4.12 x_refsource_MISC
-
https://github.com/symfony/symfony/releases/tag/v8.0.12 x_refsource_MISC
Affected products
yaml
- ==>= 8.0.0-BETA1, < 8.0.12
- ==>= 6.0.0-BETA1, < 6.4.40
- ==>= 7.0.0-BETA1, < 7.4.12
- ==< 5.4.52
symfony
- ==>= 8.0.0-BETA1, < 8.0.12
- ==>= 6.0.0-BETA1, < 6.4.40
- ==>= 7.0.0-BETA1, < 7.4.12
- ==< 5.4.52