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.

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Fixes

Solution

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Workaround

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History

Thu, 16 Apr 2026 19:00:00 +0000

Type Values Removed Values Added
First Time appeared Protocol Buffers
Protocol Buffers protobuf-php
Vendors & Products Protocol Buffers
Protocol Buffers protobuf-php

Thu, 16 Apr 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 16 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input
Weaknesses CWE-20
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Google

Published:

Updated: 2026-04-16T15:24:43.164Z

Reserved: 2026-04-15T21:56:37.963Z

Link: CVE-2026-6409

cve-icon Vulnrichment

Updated: 2026-04-16T15:24:31.568Z

cve-icon NVD

Status : Received

Published: 2026-04-16T15:17:41.910

Modified: 2026-04-16T15:17:41.910

Link: CVE-2026-6409

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-16T18:58:27Z

Weaknesses