GHSA-p2gh-cfq4-4wjc
Medium · 6.5Protobuf: Denial of Service issue through malicious messages containing negative varints or deep recursion
CVSS
6.5
EPSS
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Published
Mar 25, 2026
CISA due date
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The record
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 `varint`s or deep recursion—can be used to crash the application, impacting service availability.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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