CVE-2026-6409
Low
Low
Medium
High
Critical
CVSS Score
Vulnerability Description
A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those containing negative varints or deep recursion—can be used to crash the application, impacting service availability.
Severity Details
out of 10.0
Low
Weakness Type (CWE)
CWE-20
Top 25 #14
Improper Input Validation
- Description
- The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
- Exploit Likelihood
- High
- Typical Severity
- High
- Abstraction Level
- Class
Key Information
- Published Date
- April 16, 2026
