CVE & CISA-KEV Catalog

CVE-2026-1035

LOW
3.1
CVSS v3
NVD

Description

A flaw was found in the Keycloak server during refresh token processing, specifically in the TokenManager class responsible for enforcing refresh token reuse policies. When strict refresh token rotation is enabled, the validation and update of refresh token usage are not performed atomically. This allows concurrent refresh requests to bypass single-use enforcement and issue multiple access tokens from the same refresh token. As a result, Keycloak’s refresh token rotation hardening can be undermined.

CWE-367TOCTOU Race Condition

How to fix

Remediation Available
rhbk/keycloakRed Hat / RHEL
Fixed in:rhel9@sha256:a4cb583985eb220ad05b1983a98a5a50e2b76c15e6f56152045591e3994f37d1_ppc64leRHSA-2026:6478
Fixed in:rhel9-operator@sha256:715a5c6cc9061fc0305370a33f5b69a96ba7bfdb23b706a567b489fc05b05e06_ppc64leRHSA-2026:6478
Fixed in:rhel9@sha256:dc54248ad9357fbd737e6983e6d8d0c7e845e39ed6558bd7c39f7a7573459489_amd64RHSA-2026:6478
Fixed in:operator-bundle@sha256:7fb041b0e2b43954c3a83b58fd885b1cdc5bb32275e06c4c72955da5b78255c3_amd64RHSA-2026:6478
Fixed in:rhel9-operator@sha256:1a7ac3c798d83cc37dd750ed44223630f4ebff937534a59a9e9ad029dbf31a0f_amd64RHSA-2026:6478
Fixed in:rhel9@sha256:c1c1cb36f70ca142a789b359f9a120d321f58adc44e2c97a49c2d6f270d15bd9_arm64RHSA-2026:6478
Fixed in:rhel9-operator@sha256:c68d195c2d19568d9789648ef347a3388da453c83120d696453333c34a564347_arm64RHSA-2026:6478
Fixed in:rhel9@sha256:33fc8c6edb3c5c2df302ea53a89454320e08ff4660ba84d0a78f6c67178dfb16_s390xRHSA-2026:6478
Fixed in:rhel9-operator@sha256:0d90a1c28652b5f73ea90f78968548178cf710121fcb13774a467aeb9c30ab09_s390xRHSA-2026:6478
rhbk/keycloakRocky
Fixed in:rhel9@sha256:a4cb583985eb220ad05b1983a98a5a50e2b76c15e6f56152045591e3994f37d1_ppc64leRHSA-2026:6478
Fixed in:rhel9-operator@sha256:715a5c6cc9061fc0305370a33f5b69a96ba7bfdb23b706a567b489fc05b05e06_ppc64leRHSA-2026:6478
Fixed in:rhel9@sha256:dc54248ad9357fbd737e6983e6d8d0c7e845e39ed6558bd7c39f7a7573459489_amd64RHSA-2026:6478
Fixed in:operator-bundle@sha256:7fb041b0e2b43954c3a83b58fd885b1cdc5bb32275e06c4c72955da5b78255c3_amd64RHSA-2026:6478
Fixed in:rhel9-operator@sha256:1a7ac3c798d83cc37dd750ed44223630f4ebff937534a59a9e9ad029dbf31a0f_amd64RHSA-2026:6478
Fixed in:rhel9@sha256:c1c1cb36f70ca142a789b359f9a120d321f58adc44e2c97a49c2d6f270d15bd9_arm64RHSA-2026:6478
Fixed in:rhel9-operator@sha256:c68d195c2d19568d9789648ef347a3388da453c83120d696453333c34a564347_arm64RHSA-2026:6478
Fixed in:rhel9@sha256:33fc8c6edb3c5c2df302ea53a89454320e08ff4660ba84d0a78f6c67178dfb16_s390xRHSA-2026:6478
Fixed in:rhel9-operator@sha256:0d90a1c28652b5f73ea90f78968548178cf710121fcb13774a467aeb9c30ab09_s390xRHSA-2026:6478

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredLow
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityLow
AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

Exploit Intelligence

0.28%probability of exploitation in 30 days
20thpercentile

Low risk: more likely to be exploited than 20% of all known CVEs.

References

Related Vulnerabilities

Other CWE-367 (TOCTOU Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2022-36980High8.183%-Fix
CVE-2024-30088High7.068%KEV + RansomFix
CVE-2004-0594Medium5.155%-Fix
CVE-2024-50379Critical9.844%-Fix
CVE-2023-38146High8.839%-Fix
CVE-2024-0132Critical9.037%-Fix
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CVE-2026-1035 severity badge

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-02.