{"answers":{"affected":"1 open source package ship an affected version, including grafana. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-21720 in the wild and no public exploit code.","fix":"Upgrade grafana to a fixed version for your release line: 11.6.9, 12.0.8, 12.1.5 or 12.2.3.","what":"CVE-2026-21720 is a high-severity denial of service vulnerability in Grafana Grafana, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-21720 and fix it if it is affected.\n\nWhat it is: CVE-2026-21720 is a high-severity denial of service vulnerability in Grafana Grafana, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-21720 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- grafana (Bitnami): affected from 3.0.0; fixed in 11.6.9, 12.0.8, 12.1.5, 12.2.3, 12.3.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-21720/ (Markdown: https://insights.sbomify.com/CVE-2026-21720/index.md)","id":"CVE-2026-21720","markdown":"https://insights.sbomify.com/CVE-2026-21720/index.md","name":"CVE-2026-21720","record":{"aliases":["BIT-grafana-2026-21720","CLSA-2026-1775824794","CLSA-2026-1775825437","GHSA-m4rj-q4ph-fr4v","MINI-2chx-2fp4-x7hx","MINI-3fwr-w8hj-3c9m","MINI-7hcq-3q76-94g5","MINI-8gqf-6545-p7cp","MINI-f8p3-vcvj-4544","MINI-fmjp-w24w-228r","MINI-gfh8-pw32-mpjc","MINI-gx42-9h47-2q8q","MINI-h268-xc7j-f3gp","MINI-h9hx-g4fr-mhm4","MINI-j45x-76m7-cv2m","MINI-jh9q-52v6-prvq","MINI-p7f5-jcmx-58x3","MINI-w453-mrwc-45pv","UBUNTU-CVE-2026-21720"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Grafana monitoring platform","requires_auth":"none","summary":"Unauthenticated attackers can cause Grafana to crash by exhausting memory through goroutine leaks triggered by timed-out avatar requests.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GRAFANA","cpe":[{"product":"grafana","vendor":"grafana"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-772","name":"Missing Release of Resource after Effective Lifetime"},{"id":"CWE-703","name":"Improper Check or Handling of Exceptional Conditions"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"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.","ecosystems":["Bitnami"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Unauthenticated DoS: avatar cache leaks goroutines when /avatar/:hash requests time out","id":"CVE-2026-21720","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"grafana:grafana","products":["grafana:grafana"],"type":"denial_of_service","year":"2026"},"n_packages":1,"n_references":1,"next":{"headline":"Dashboard Permissions Scope Bypass Enables Cross‑Dashboard Privilege Escalation","id":"CVE-2026-21721"},"packages":[{"ecosystem":"Bitnami","fixed":["11.6.9","12.0.8","12.1.5","12.2.3","12.3.1"],"introduced":["3.0.0","12.0.0","12.1.0","12.2.0","12.3.0"],"last_affected":[],"package":"grafana","purl":"pkg:bitnami/grafana","source":"BIT-grafana-2026-21720"}],"prev":{"headline":"Command injection in CubeCart","id":"CVE-2026-21719"},"products":["grafana/grafana","grafana/grafana-enterprise"],"published":"2026-01-27","related":[{"cvss_score":7.5,"headline":"Grafana Path Traversal","id":"CVE-2021-43798","kev_date_added":"2025-10-09","published":"2021-12-07"},{"cvss_score":10,"headline":"Incorrect privilege assignment","id":"CVE-2025-41115","kev_date_added":null,"published":"2025-11-21"},{"cvss_score":9.8,"headline":"Grafana vulnerable to race condition allowing privilege escalation","id":"CVE-2022-39328","kev_date_added":null,"published":"2022-11-08"},{"cvss_score":9.8,"headline":"Auth bypass in n/a","id":"CVE-2022-28660","kev_date_added":null,"published":"2022-05-20"},{"cvss_score":9.8,"headline":"Information disclosure in n/a","id":"CVE-2022-26148","kev_date_added":null,"published":"2022-03-21"},{"cvss_score":9.8,"headline":"Grafana Authentication Bypass","id":"CVE-2018-15727","kev_date_added":null,"published":"2018-08-29"},{"cvss_score":9.4,"headline":"Grafana SQL Expressions allow for remote code execution","id":"CVE-2024-9264","kev_date_added":null,"published":"2024-10-18"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-27","vendors":["Grafana"]},"summary":"Unauthenticated attackers can cause Grafana to crash by exhausting memory through goroutine leaks triggered by timed-out avatar requests.","url":"https://insights.sbomify.com/CVE-2026-21720/"}