Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-21720

Every uncached /avatar/:hash request spawns a goroutine that refreshes the Gravatar image. If the refresh sits in the 10-slot worker queue longer than three seconds, the handler times out and stops listening for the result, so that goroutine blocks forever trying to send on an unbuffered channel. Sustained traffic with random hashes keeps tripping this timeout, so goroutine count grows linearly, eventually exhausting memory and causing Grafana to crash on some systems.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 16.1%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-21720


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