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Vulnerabilities CVE-2026-21720

CVE-2026-21720

High
Open
TLP:CLEAR

Unauthenticated DoS: avatar cache leaks goroutines when /avatar/:hash requests time out

NVD CVE.org
Critical Infrastructure

AI Analysis

No AI analysis yet.

Description

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.

Details

CVSS Score
7.5
EPSS Score
0.62%

46.4th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Jan 27, 2026
Last Modified
Aug 11, 2026
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