CVE-2026-6409 Details
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.
A denial-of-service vulnerability has been identified in the Protobuf PHP library, specifically in versions prior to 5.34.0-RC1 and 4.33.6. This vulnerability arises during the parsing of untrusted input, where maliciously crafted messages containing negative varints or deep recursion can crash the application, disrupting service availability.
Users can upgrade to Protobuf versions 5.34.0-RC1 or 4.33.6 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 16, 2026References 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 | [email protected] |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
No affected product data is available for this CVE.
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 16, 2026 | New CVE Received | [email protected] |