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.

• CVE-2026-21720: fix denial of service by preventing goroutine leaks and memory exhaustion triggered by unauthenticated avatar cache requests

• CVE-2026-21720: fix denial of service by preventing goroutine leaks and memory exhaustion triggered by unauthenticated avatar cache requests

These are all security issues fixed in the grafana-11.6.14+security01-1.1 package on the GA media of openSUSE Tumbleweed.

This update for grafana fixes the following issues:

Changes in grafana:

• Update to version 11.6.11: Features and enhancements:

  • Alerting: Add limits for the size of expanded notification templates
  • Correlations: Remove support for org_id=0 Security:
  • CVE-2026-21722: Public dashboards annotations: use dashboard timerange if time selection disabled (bsc#1258136)

• Update to version 11.6.10: Features and enhancements:

  • API: Add missing scope check on dashboards
  • Avatar: Require sign-in, remove queue, respect timeout Bug fixes:
  • Alerting: Fix a race condition panic in ResetStateByRuleUID

• Update to version 11.6.9: Features and enhancements:

  • Plugins: Add PluginContext to plugins when scenes is disabled Bug fixes:
  • Alerting: Fix contacts point issues

• Update to version 11.6.8: Bug fixes:

  • Alerting: Fix unmarshalling of GettableStatus to include time intervals

• Update to version 11.6.7: Bug fixes:

  • Auth: Fix render user OAuth passthrough
  • LDAP Authentication: Fix URL to propagate username context as parameter
  • Plugins: Dependencies do not inherit parent URL for preinstall
  • URLParams: Stringify true values as key=true always (fixes issues with variables with true value)

• Update to version 11.6.6: Bug fixes:

  • Alerting: Fix copying of recording rule fields
  • Fix redirection after login when Grafana is served from subpath

• Update to version 11.6.5: Features and enhancements:

  • Alerting: Bump alerting package to include change to NewTLSClient

• Update to version 11.6.4: Features and enhancements:

  • StateTimeline: Add endTime to tooltip
  • Unified storage: Respect GF_DATABASE_URL override Bug fixes:
  • Alerting: Fix group interval override when adding new rules
  • Azure: Fix legend formatting
  • Azure: Fix resource name determination in template variable queries
  • Graphite: Fix annotation queries
  • Graphite: Fix date mutation
  • Graphite: Fix nested variable interpolation for repeated rows

• Update to version 11.6.3: Security:

  • Fixes CVE-2025-3415

• Update to version 11.6.2: Bug fixes:

  • Dashboard: Fixes issue with row repeats and first row
  • Graphite: Ensure template variables are interpolated correctly
  • Graphite: Fix Graphite series interpolation
  • Prometheus: Fix semver import path

• Update to version 11.6.1: Features and enhancements:

  • DashboardScenePage: Correct slug in self referencing data links
  • GrafanaUI: Use safePolygon close handler for interactive tooltips instead of a delay
  • Prometheus: Add support for cloud partners Prometheus data sources Bug fixes:
  • Alertmanager: Add Role-Based Access Control via reqAction Field
  • GrafanaUI: Remove blurred background from overlay backdrops to improve performance
  • InfluxDB: Fix nested variable interpolation
  • LDAP test: Fix page crash
  • Org redirection: Fix linking between orgs

• Upgrade to version 11.6.0: Features and enhancements:

  • Visualisations: One click links and actions
  • Annotations: Add cron syntax support
  • WebGL-powered geomaps for better performance
  • Alerting: Add alert rule version history Security:
  • API keys: Migrate API keys to service accounts at startup

• CVE-2026-21721: Fix access control by the dashboard permissions API (bsc#1257337)

• CVE-2026-21720: Fix unauthenticated DoS (bsc#1257349)

• CVE-2025-68156: Fix potential DoS via unbounded recursion in builtin functions (bsc#1255340)

• CVE-2025-64751: Drop experimental implementation of authorization Zanzana server/client (bsc#1254113)

• Use forked wire from Grafana repository instead of external package (jsc#PED-14178).

• Update to version 11.5.10: Security:

  • CVE-2025-47911: Fix parsing HTML documents (bsc#1251454)
  • CVE-2025-58190: Fix excessive memory consumption (bsc#1251657) Features and enhancements:
  • Update to Go 1.25
  • Update to golang.org/x/net v0.45.0 Bug fixes:
  • Auth: Fix render user OAuth…

This update fixes the following issues:

dracut-saltboot:

• Version update to 1.1.0:

  • Retry DHCP requests up to 3 times (bsc#1253004)

golang-github-QubitProducts-exporter_exporter:

• Non-customer-facing optimization and update

golang-github-boynux-squid_exporter:

• Version update from 1.6.0 to 1.13.0 with the following highlighted changes and fixes (jsc#PED-14971):

  • Added compatibility for Squid 6 and support for the squid-internal-mgr metrics path
  • Added TLS and Basic Authentication to the exporter’s web interface
  • Added support for the exporter to authenticate against the Squid proxy itself
  • Allow the gathering of process information without requiring root privileges
  • The exporter can now be configured using environment variables
  • Added support for custom labels to all exported metrics for better data filtering
  • New metrics to track if Squid is running (squid_up), how long a scrape takes, and if any errors occurred
  • Added 'service time' metrics to analyze proxy speed and performance.
  • Added a metric for open file descriptors (process_open_fds) to help prevent connection bottlenecks
  • Corrected the squid_client_http_requests_total metric to ensure accurate reporting

golang-github-lusitaniae-apache_exporter:

• Version update from 1.0.8 to 1.0.10:

  • Updated github.com/prometheus/client_golang to 1.21.1
  • Updated github.com/prometheus/common to 0.63.0
  • Updated github.com/prometheus/exporter-toolkit to 0.14.0
  • Fixed signal handler logging

golang-github-prometheus-prometheus:

• Security issues fixed:

  • CVE-2026-27606: Fixed arbitrary file write via path traversal in rollup (bsc#1258893)
  • CVE-2026-25547: Fixed unbounded brace range expansion leading to excessive CPU and memory consumption (bsc#1257841)
  • CVE-2026-1615, CVE-2025-61140 The old web UI is no longer built due to security issues (bsc#1257897, bsc#1257442)
  • CVE-2025-13465: Bump lodash package to version 4.17.23 to fix prototype pollution vulnerability (bsc#1257329)
  • CVE-2025-12816: Interpretation conflict vulnerability allowing bypassing cryptographic verifications (bsc#1255588)

• Version update from 2.53.4 to 3.5.0 with the following highlighted changes (jsc#PED-13824):

  • Modernized Interface: Introduced a brand-new UI
  • Enhanced Cloud and Auth: Added unified AWS service discovery (EC2, ECS, Lightsail) and Azure Workload Identity support for more secure, native cloudauthentication.
  • Performance Standards: Fully integrated OpenTelemetry (OTLP) ingestion and moved Native Histograms from experimental to a stable feature.
  • Advanced Data Export: Rolled out Remote Write 2.0, offering better performance and metadata handling when sending data to external systems.
  • Query Power: Added new PromQL functions (like first_over_time and last_over_time) and optimization for grouping operations
  • Better Visibility: The UI now displays detailed relabeling steps, scrape intervals, and timeouts, making it easier to troubleshoot why targets aren't reporting correctly.
  • Critical Fixes: Resolved significant memory leaks related to query logging and fixed bugs where targets were accidentally being scraped multiple times

grafana:

• Security issues fixed:

  • CVE-2026-21722: Public dashboards annotations: use dashboard timerange if time selection disabled (bsc#1258136)
  • CVE-2026-21721: Fixed access control by the dashboard permissions API (bsc#1257337)
  • CVE-2026-21720: Fixed unauthenticated DoS (bsc#1257349)
  • CVE-2025-68156: Fixed potential DoS via unbounded recursion in builtin functions (bsc#1255340)
  • CVE-2025-3415: Fixedexposure of DingDing alerting integration URL to Viewer level users (bsc#1245302)

• Version update from 11.5.10 to 11.6.11 with the following highlighted changes and fixes:

  • Performance Boost: Introduced WebGL-powered geomaps for smoother map visualizations and removed blurred backgrounds from UI overlays to speed up the interface *…

This update for grafana fixes the following issues:

• Security issues fixed:

  • CVE-2026-21722: Public dashboards annotations: use dashboard timerange if time selection disabled (bsc#1258136)
  • CVE-2026-21721: Fixed access control by the dashboard permissions API (bsc#1257337)
  • CVE-2026-21720: Fixed unauthenticated DoS (bsc#1257349)
  • CVE-2025-68156: Fixed potential DoS via unbounded recursion in builtin functions (bsc#1255340)
  • CVE-2025-3415: Fixed exposure of DingDing alerting integration URL to Viewer level users (bsc#1245302)

• Version update from 11.5.10 to 11.6.11 with the following highlighted changes and fixes:

  • Performance Boost: Introduced WebGL-powered geomaps for smoother map visualizations and removed blurred backgrounds from UI overlays to speed up the interface.
  • One-Click Actions: Visualizations now support faster navigation via one-click links and actions.
  • Alerting History: Added version history for alert rules, allowing you to track changes over time.
  • Service Accounts: Automated the migration of old API keys to more secure Service Accounts upon startup.
  • Cron Support: Annotations now support Cron syntax for more flexible scheduling.
  • Identity and Auth: Hardened the Avatar feature (now requires sign-in) and fixed several login redirection issues when Grafana is hosted on a subpath.
  • Data Source Support: Added support for Cloud Partner Prometheus data sources and improved Azure legend formatting.
  • Alerting Limits: Added size limits for expanded notification templates to prevent system strain.
  • RBAC: Integrated Role-Based Access Control (RBAC) into the Alertmanager via the reqAction field.
  • Data Consistency: Fixed several issues with Graphite and InfluxDB regarding how variables are handled in repeated rows or nested queries.
  • Dashboard Reliability: Resolved bugs involving row repeats and 'self-referencing' data links.
  • Alerting Fixes: Patched a critical 'panic' (crash) caused by a race condition in alert rules and fixed issues where contact points weren't working correctly.
  • URL Handling: Fixed a bug where 'true' values in URL parameters weren't being read correctly

This update fixes the following issues:

golang-github-lusitaniae-apache_exporter:

• Internal changes to fix build issues with no impact for customers

golang-github-prometheus-prometheus:

• Security issues fixed:

  • CVE-2026-27606: Fixed arbitrary file write via path traversal in rollup (bsc#1258893)
    • Bumped rollup to version 4.59.0
  • CVE-2026-25547: Fixed unbounded brace range expansion leading to excessive CPU and memory consumption (bsc#1257841)
    • Bumped brace-expansion to version 5.0.2
  • CVE-2026-1615, CVE-2025-61140 The old web UI is no longer built due to security issues (bsc#1257897, bsc#1257442)
  • CVE-2025-13465: Bumped lodash package to version 4.17.23 to fix prototype pollution vulnerability (bsc#1257329)
  • CVE-2026-33186: Fixed authorization bypass due to improper validation of the HTTP/2 :path pseudo-header (bsc#1260267)
    • Bumped google.golang.org/grpc to version 1.79.3

grafana:

• Security issues fixed:

  • CVE-2026-21722: Public dashboards annotations: use dashboard timerange if time selection disabled (bsc#1258136)
  • CVE-2026-21721: Fixed access control by the dashboard permissions API (bsc#1257337)
  • CVE-2026-21720: Fixed unauthenticated DoS (bsc#1257349)
  • CVE-2025-3415: Fixed exposure of DingDing alerting integration URL to Viewer level users (bsc#1245302)
  • CVE-2026-26958: Bumped filippo.io/edwards25519 to version 1.1.1 (bsc#1258595)
  • CVE-2026-21725: Fixed missing UID when deleting datasource by name (bsc#1258873)
  • CVE-2026-21725: Fixed missing UID when deleting datasource by name (bsc#1258873)
  • CVE-2026-27876: Fixed remote arbitrary code execution via chained SQL Expressions (bsc#1261025)
  • CVE-2026-27877: Fixed information disclosure of data-source passwords via public dashboards (bsc#1261026)
  • CVE-2026-28375: Fixed denial of service via testdata data-source (bsc#1261029)
  • CVE-2026-27879: Fixed denial of service via resample query (bsc#1261027)
  • CVE-2026-33186: Fixed authorization bypass due to improper validation of the HTTP/2 :path pseudo-header (bsc#1260263)
  • CVE-2026-21724: Fixed authorization bypass allows modification of protected webhook URLs (bsc#1260878)

• Version update from 11.5.10 to 11.6.14+security01 with the following highlighted changes and fixes:

  • Public Dashboards: Wired the public dashboard service to the HTTP server to ensure proper connectivity and availability
  • Authentication: Refined the redirect logic to ensure consistent behavior during login and logout sequences
  • Dashboard Reliability: Resolved a bug preventing single panels from rendering correctly when dashboard variables are referenced
  • Performance Boost: Introduced WebGL-powered geomaps for smoother map visualizations and removed blurred backgrounds from UI overlays to speed up the interface
  • One-Click Actions: Visualizations now support faster navigation via one-click links and actions
  • Alerting History: Added version history for alert rules, allowing you to track changes over time
  • Service Accounts: Automated the migration of old API keys to more secure Service Accounts upon startup
  • Cron Support: Annotations now support Cron syntax for more flexible scheduling
  • Identity and Auth: Hardened the Avatar feature (now requires sign-in) and fixed several login redirection issues when Grafana is hosted on a subpath
  • Data Source Support: Added support for Cloud Partner Prometheus data sources and improved Azure legend formatting
  • Alerting Limits: Added size limits for expanded notification templates to prevent system strain
  • RBAC: Integrated Role-Based Access Control (RBAC) into the Alertmanager via the reqAction field
  • Data Consistency: Fixed several issues with Graphite and InfluxDB regarding how variables are handled in repeated rows or nested queries
  • Dashboard Reliability:
    • Fixed bugs involving row repeats and 'self-referencing' data links
    • Fixed a bug preventing single panels from…