Protocol Buffers vulnerabilities

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Published CVEs affecting Protocol Buffers products: 1 record(s), with severity, exploitation and fixes.

Protobuf-php (Pecl) 1

Exploited only (KEV) →

CVE-2026-6409 High · 7.1 CWE-20 Apr 16, 2026

Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input

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.