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TI-2026-55150 Aliases CVE-2026-79651GHSA-8qv5-pjhw-3gx4

Keycloak-services: keycloak-services: unauthenticated dos via unbounded locale caching

Priority MEDIUM 40CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-400.

Summary

A flaw was found in the theme localization endpoints of the keycloak-services component, which is the core service responsible for authentication flows and theme management in Keycloak. The issue occurs because the system accepts arbitrary locale tags from unauthenticated requests and stores them in a permanent in-memory cache without limits. An attacker can exploit this by sending a large number of unique locale tags, eventually causing the server to run out of memory and crash.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00806 57th percentileScored 2026-11-07
Fix Fixed Red Hat: 4 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat build of Keycloak 26.4—26.4.16-2Patch availableCNA
Red HatRed Hat build of Keycloak 26.4—26.4-26Patch availableCNA
Red HatRed Hat build of Keycloak 26.4—26.4-26Patch availableCNA
Red HatRed Hat build of Keycloak 26.4.16——Not affectedCNA
Red HatRed Hat build of Keycloak 26.4.16——Not affectedCNA
Red HatRed Hat build of Keycloak 26.4.16——Not affectedCNA
Red HatRed Hat build of Keycloak 26.6—26.6.7-3Patch availableCNA
Red HatRed Hat build of Keycloak 26.6—26.6-20Patch availableCNA
Red HatRed Hat build of Keycloak 26.6—26.6-20Patch availableCNA
Red HatRed Hat build of Keycloak 26.6.7——Not affectedCNA
Red HatRed Hat build of Keycloak 26.6.7——Not affectedCNA
Red HatRed Hat build of Keycloak 26.6.7——Not affectedCNA
Red HatRed Hat Single Sign-On 7——Not affectedCNA
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4.16-2 Patch available CNA
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4-26 Patch available CNA
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4-26 Patch available CNA
  • Red Hat build of Keycloak 26.4.16 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat build of Keycloak 26.4.16 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat build of Keycloak 26.4.16 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6.7-3 Patch available CNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6-20 Patch available CNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6-20 Patch available CNA
  • Red Hat build of Keycloak 26.6.7 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat build of Keycloak 26.6.7 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat build of Keycloak 26.6.7 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Single Sign-On 7 VendorRed Hat Affected — Fixed in — Not affected CNA

CPE names CNA · 3

CPEVersionsRoleVendor
cpe:/a:redhat:build_keycloak:26.4::el926.4—Red Hat
cpe:/a:redhat:build_keycloak:26.6::el926.6—Red Hat
cpe:/a:redhat:red_hat_single_sign_on:77—Red Hat
  • cpe:/a:redhat:build_keycloak:26.4::el9 Versions 26.4 — ·Red Hat
  • cpe:/a:redhat:build_keycloak:26.6::el9 Versions 26.6 — ·Red Hat
  • cpe:/a:redhat:red_hat_single_sign_on:7 Versions 7 — ·Red Hat

Remediation

Red Hat 4 advisories

  • RHSA-2026:68276 Released 2026-09-16 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.16 Images Security Update
    • Red Hat build of Keycloak 26.4 rhbk/keycloak-operator-bundle, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
  • RHSA-2026:68277 Released 2026-09-16 · Red Hat rating Important
    Red Hat build of Keycloak 26.6.7 Images Security Update
    • Red Hat build of Keycloak 26.6 rhbk/keycloak-operator-bundle, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
  • RHSA-2026:68280 Released 2026-09-16 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.16 Security Update
    • Red Hat build of Keycloak 26.4.16
Show 1 more Red Hat advisories
  • RHSA-2026:68278 Released 2026-09-16 · Red Hat rating Important
    Red Hat build of Keycloak 26.6.7 Security Update
    • Red Hat build of Keycloak 26.6.7

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat build of Keycloak 26.4Fixed RHSA-2026:68276
Red Hat build of Keycloak 26.4.16Fixed RHSA-2026:68280
Red Hat build of Keycloak 26.6Fixed RHSA-2026:68277
Red Hat build of Keycloak 26.6.7Fixed RHSA-2026:68278
Not affected: 1 product
  • Red Hat Single Sign-On 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-79651
  2. 2026-10-03 Alias added: GHSA-8qv5-pjhw-3gx4

References

Advisory 4

Other 2

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7413 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences