CVE & CISA-KEV Catalog

CVE-2026-2575

MEDIUM
5.3
CVSS v3
NVD

Description

A flaw was found in Keycloak. An unauthenticated remote attacker can trigger an application level Denial of Service (DoS) by sending a highly compressed SAMLRequest through the SAML Redirect Binding. The server fails to enforce size limits during DEFLATE decompression, leading to an OutOfMemoryError (OOM) and subsequent process termination. This vulnerability allows an attacker to disrupt the availability of the service.

CWE-409

How to fix

Remediation Available
rhbk/keycloakRed Hat / RHEL
Fixed in:rhel9@sha256:884c31d8ddfd03349a65bc76851cdf83d7cf8db0983e9e8c52a648298cd8c7eb_amd64RHSA-2026:3948
Fixed in:operator-bundle@sha256:ae13f29ccde0ddf5d96d14567177fcdfa2dd12cb29ca7793b47c857436d2a3e8_amd64RHSA-2026:3948
Fixed in:rhel9-operator@sha256:adc45a57c1cc6f816e6c0074cd9aeba6c6b323a0c708d5d11678bb49af578a6a_amd64RHSA-2026:3948
Fixed in:rhel9@sha256:b0efe038b71e19b53e41ccede51fefcd03d81e2aafd6fa0b23b5b9c8dac212fd_s390xRHSA-2026:3948
Fixed in:rhel9-operator@sha256:cbb01b2cdd4857eddc5c94a1382c11901883d0df6176593a099d01791f6b72bf_s390xRHSA-2026:3948
Fixed in:rhel9@sha256:48fa03e7e881b996085a2207878c6ab610fa770fbedf41f195d270aefb8bf9f7_arm64RHSA-2026:3948
Fixed in:rhel9-operator@sha256:2ff84fdf2ccf5ef7fb360d0b33b7369ae948b7eba84926320431adb1da23d9a7_arm64RHSA-2026:3948
Fixed in:rhel9@sha256:73cf1a2410318ef2e508c21dc5c3332d3f3658eaab7d9b0e4dadfb570c002899_ppc64leRHSA-2026:3948
Fixed in:rhel9-operator@sha256:edeb162dfffdcaf118c3fa7b951a563de58a88b4604764c8651396056e6ba814_ppc64leRHSA-2026:3948
rhbk/keycloakRocky
Fixed in:rhel9@sha256:884c31d8ddfd03349a65bc76851cdf83d7cf8db0983e9e8c52a648298cd8c7eb_amd64RHSA-2026:3948
Fixed in:operator-bundle@sha256:ae13f29ccde0ddf5d96d14567177fcdfa2dd12cb29ca7793b47c857436d2a3e8_amd64RHSA-2026:3948
Fixed in:rhel9-operator@sha256:adc45a57c1cc6f816e6c0074cd9aeba6c6b323a0c708d5d11678bb49af578a6a_amd64RHSA-2026:3948
Fixed in:rhel9@sha256:b0efe038b71e19b53e41ccede51fefcd03d81e2aafd6fa0b23b5b9c8dac212fd_s390xRHSA-2026:3948
Fixed in:rhel9-operator@sha256:cbb01b2cdd4857eddc5c94a1382c11901883d0df6176593a099d01791f6b72bf_s390xRHSA-2026:3948
Fixed in:rhel9@sha256:48fa03e7e881b996085a2207878c6ab610fa770fbedf41f195d270aefb8bf9f7_arm64RHSA-2026:3948
Fixed in:rhel9-operator@sha256:2ff84fdf2ccf5ef7fb360d0b33b7369ae948b7eba84926320431adb1da23d9a7_arm64RHSA-2026:3948
Fixed in:rhel9@sha256:73cf1a2410318ef2e508c21dc5c3332d3f3658eaab7d9b0e4dadfb570c002899_ppc64leRHSA-2026:3948
Fixed in:rhel9-operator@sha256:edeb162dfffdcaf118c3fa7b951a563de58a88b4604764c8651396056e6ba814_ppc64leRHSA-2026:3948

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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 ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityLow

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

Exploit Intelligence

0.50%probability of exploitation in 30 days
40thpercentile

Low risk: more likely to be exploited than 40% of all known CVEs.

References

Related Vulnerabilities

Other CWE-409 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2026-49975High7.511%-Fix
CVE-2026-21441High7.52.7%-Fix
CVE-2024-43499High7.52.6%-Fix
CVE-2024-28180Medium4.32.0%-Fix
CVE-2017-16129Medium5.91.8%-Fix
CVE-2022-29225High7.51.4%-Fix
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CVE-2026-2575 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 2026-06-03.