CVE-2026-6409

Published: Apr 16, 2026

Modified: Apr 16, 2026

PUBLISHED

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.

Vendor	Product	Versions
Protocol Buffers	Protobuf-php (Pecl)	affected `0 - < 5.34.0-RC1` affected `0 - < 4.33.6`

Weaknesses (CWE)

CWE-20

References

https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-p2gh-cfq4-4wjc

Security Training

Train your team to recognize and prevent security threats with our comprehensive security awareness program.

Start Training

Vulnerability Scanning

Discover vulnerabilities in your applications and infrastructure before attackers do.

Scan Now

CVE-2026-6409

Description

Affected Products

Weaknesses (CWE)

References