CVE-2026-6409Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input
Updated under an hour ago ()
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It affects Protocol Buffers Protobuf-php (Pecl). Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.1 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-20
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- NVD analysis
- Awaiting Analysis
- Record last updated
- Apr 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Protocol Buffers Protobuf-php (Pecl) protocol_buffers:protobuf_php_pecl (from the name) | before 5.34.0-RC1; before 4.33.6 | CNA record |
References
- https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-p2gh-cfq4-4wjc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.