# Keycloak: Denial of Service via specially crafted SAML input

Advisory record · `GHSA-p5mv-gj8j-xqgf`

- **Identifiers:** `GHSA-p5mv-gj8j-xqgf` · `BIT-keycloak-2026-7307` · `CVE-2026-7307`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-1286](https://cwe.mitre.org/data/definitions/1286.html)
- **Tags:** [CWE-1286](https://agentprime.io/advisories/tag/cwe-1286.md)
- **Published:** 19 May 2026
- **Updated:** 26 Aug 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 19 May 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.keycloak:keycloak-saml-core` (Maven): affected `<26.6.2`; fixed in `26.6.2`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Keycloak's keycloak-saml-core package is affected in versions before 26.6.2. A remote, unauthenticated attacker can send specially crafted XML to the SAML endpoint, causing high CPU use and worker thread starvation that makes the server unavailable. Upgrade keycloak-saml-core to version 26.6.2 or later.

Written 2 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (redhat)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0088, the 59th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:19 UTC: First seen by agentprime
- 31 Oct 2026, 14:19 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-p5mv-gj8j-xqgf)

## Sources

- [GitHub Advisory Database: GHSA-p5mv-gj8j-xqgf](https://github.com/advisories/GHSA-p5mv-gj8j-xqgf)
- [OSV: GHSA-p5mv-gj8j-xqgf](https://osv.dev/vulnerability/GHSA-p5mv-gj8j-xqgf)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-7307>
- <https://github.com/keycloak/keycloak/pull/49119>
- <https://github.com/keycloak/keycloak/commit/be84d28ce4c69c038d542f11405d5ede1d61f4a9>
- <https://access.redhat.com/errata/RHSA-2026:19594>
- <https://access.redhat.com/errata/RHSA-2026:19595>
- <https://access.redhat.com/errata/RHSA-2026:19596>
- <https://access.redhat.com/errata/RHSA-2026:19597>
- <https://access.redhat.com/security/cve/CVE-2026-7307>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2476526>
- <https://github.com/keycloak/keycloak>
- <https://github.com/keycloak/keycloak/releases/tag/26.6.2>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-p5mv-gj8j-xqgf>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-p5mv-gj8j-xqgf/>. Everything for agents: <https://agentprime.io/llms.txt>.