CVE•Published 2026-01-27•Modified 2026-07-15•0 articles on news•4 live references•NVD data
CVE-2026-21720Grafana · Grafana
Vulnerability data via NVD (ingested)
CVSS v3.1
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS percentile
45
Exploit Prediction Scoring System · top 55% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2026-01-27
Modified 2026-07-15
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag20,515 hosts
vuln:CVE-2026-21720Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Grafana Grafana"All exposed Grafana Grafana instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Grafana"HTTP body or banner mentions "Grafana" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-21720Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-21720Censys host search filtered to this CVE id.
grep.app
CVE-2026-21720Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-21720GitHub code search for direct mentions.
Google dork
"CVE-2026-21720" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (3)
CVE-2026-217203 repos
Xuchen-Li/cv-arxiv-dailyPython
Automatically update arXiv papers about SOT & VLT, Multi-modal Learning, LLM and Video Understanding using Github Actions.
XuzhaoLi/ro-arxiv-dailyPython
Automatically Update Arxiv Papers about Path Planning, LLM and Autonomous Driving using Github Actions since 2024.2.
cnlinxi/LLM-paper-dailyPython
Automatically Update LLM Papers Daily using Github Actions. Ref: https://github.com/Vincentqyw/cv-arxiv-daily
We haven't classified any articles referencing CVE-2026-21720 yet. The external references above still apply.