CVE-2026-6409
Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 7.1EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
16 Apr 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
Protocol Buffers · Protobuf-php (Pecl)