CVE-2026-21720Every uncached /avatar/:hash request spawns a goroutine that refreshes the Gravatar image.
Updated under an hour ago ()
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It affects grafana. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400, CWE-703, CWE-772
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
grafana grafana grafana:grafana | from 3.0.0 before 11.6.9; from 3.0.0 before 11.6.9; from 12.0.0 before 12.0.8; from 12.0.0 before 12.0.8; from 12.1.0 before 12.1.5; from 12.1.0 before 12.1.5; from 12.2.0 before 12.2.3; from 12.2.0 before 12.2.3; and 2 more ranges | NVD |
References
- https://grafana.com/security/security-advisories/cve-2026-21720broken-link
- https://access.redhat.com/security/cve/CVE-2026-21720
- https://bugzilla.redhat.com/show_bug.cgi?id=2433226
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21720.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.