GHSA-p2gh-cfq4-4wjc
Protobuf: Denial of Service issue through malicious messages containing negative varints or deep recursion
At a glance
- Published
- Updated
- CVE
- CVE-2026-6409
- CVSS_V4
- 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
Description
### Impact 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. ### Patches Patches have been released to 5.34.0-RC1 and 4.33.6.
Affected packages
| Package | Versions |
|---|---|
| Packagist · google/protobuf | introduced 0, fixed 4.33.6 |
References
- https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-p2gh-cfq4-4wjc WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-6409 ADVISORY
- https://github.com/protocolbuffers/protobuf/issues/24159 WEB
- https://github.com/protocolbuffers/protobuf/issues/25067 WEB
- https://github.com/protocolbuffers/protobuf/commit/60e93d2d104f2af9cd345b1c6f3891d91430244a WEB
- https://github.com/protocolbuffers/protobuf/commit/c8e9b27d95c6ab2d0668b5889e7dac2c477b7038 WEB
- https://github.com/protocolbuffers/protobuf PACKAGE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |