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URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6409

⇱ NVD - CVE-2026-6409

  1. Vulnerabilities

CVE-2026-6409 Detail

Awaiting Enrichment

This CVE record has been marked for NVD enrichment efforts.

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

CVSS-B 7.1 HIGH
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

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-p2gh-cfq4-4wjc Google Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-20 Improper Input Validation Google Inc.  

Change History

3 change records found show changes

CVE Modified by CISA-ADP 6/17/2026 7:00:47 AM

Action Type Old Value New Value
Added SSVC 
{"timestamp":"2026-04-16T15:23:55.455444Z","id":"CVE-2026-6409","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

CVE Modified by Google Inc. 6/17/2026 7:00:47 AM

Action Type Old Value New Value
Added Affected 
[{"vendor":"Protocol Buffers","product":"Protobuf-php (Pecl)","defaultStatus":"unaffected","versions":[{"version":"0","lessThan":"5.34.0-RC1","versionType":"semver","status":"affected"},{"version":"0","lessThan":"4.33.6","versionType":"semver","status":"affected"}]}]

New CVE Received from Google Inc. 4/16/2026 11:17:41 AM

Action Type Old Value New Value
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.
Added CVSS V4.0 
AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Added CWE 
CWE-20
Added Reference 
https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-p2gh-cfq4-4wjc

Quick Info

CVE Dictionary Entry:
CVE-2026-6409
NVD Published Date:
04/16/2026
NVD Last Modified:
06/17/2026
Source:
Google Inc.