CVE-2026-6409CWE-20

Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input

High · published April 16, 2026

CVSS v4.0
7.1
EPSS
0%
Percentile
28.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.1 · HIGH
Vector
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
EPSS
0.00360 · 28.5th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-04-16T14:30Z
EPSS history
Timeline
  • 16 APR 14:30Z
    Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input
    cvelistv5