Description
A vulnerability was found in Keycloak before 11.0.1 where DoS attack is possible by sending twenty requests simultaneously to the specified keycloak server, all with a Content-Length header value that exceeds the actual byte count of the request body.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Keycloak | Keycloak before 11.0.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Single Sign On 7 | rh-sso7-keycloak +1 | 9.0.5-1.redhat_00001.1.el6sso | RHSA-2020:3497, RHSA-2020:3496, RHSA-2020:3495 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.keycloak:keycloak-parent | < 11.0.1 | 11.0.1 | GHSA-52rg-hpwq-qp56 |
Advisories 3
- RHSA-2020:3496 Red Hat Security Advisory: Red Hat Single Sign-On 7.4.2 security update on RHEL 7 Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2020:3497 Red Hat Security Advisory: Red Hat Single Sign-On 7.4.2 security update on RHEL 8 Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2020:3495 Red Hat Security Advisory: Red Hat Single Sign-On 7.4.2 security update on RHEL 6 Red Hat Security Advisories (RHSA) · Jun 29, 2026