CVE-2026-82965: DoS (CVSS 7.5)

Description

A flaw was found in the SAML implementation of Keycloak, an open-source identity and access management solution. The SAML Artifact Resolution and ECP SOAP endpoints do not properly limit the size or complexity of incoming XML requests. An unauthenticated remote attacker can exploit this by sending specially crafted, large XML messages that cause the server to consume excessive memory. This leads to the application running out of memory and crashing, resulting in a denial of service for all users.

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CVSS v3.1 Score

7.5

HIGH

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

EPSS — Exploit Prediction

0.0065

Probability of exploitation

0.52%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

References

Other References

https://access.redhat.com/errata/RHSA-2026:95759 https://access.redhat.com/errata/RHSA-2026:95760 https://access.redhat.com/errata/RHSA-2026:95761 https://access.redhat.com/errata/RHSA-2026:95762 https://access.redhat.com/security/cve/CVE-2026-82965 https://bugzilla.redhat.com/show_bug.cgi?id=2526302

Frequently Asked Questions

What is CVE-2026-82965? +

A flaw was found in the SAML implementation of Keycloak, an open-source identity and access management solution. The SAML Artifact Resolution and ECP SOAP endpoints do not properly limit the size or complexity of incoming XML requests. An unauthenticated remote attacker can exploit this by sending specially crafted, large XML messages that cause the server to consume excessive memory. This leads to the application running out of memory and crashing, resulting in a denial of service for all users. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-82965? +

CVE-2026-82965 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0065, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-82965? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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