# Apache Kerby has a bypass the Kerberos pre-authentication check

Advisory record · `GHSA-262p-fj3f-xh7v`

- **Identifiers:** `GHSA-262p-fj3f-xh7v` · `CVE-2026-57915`
- **State:** Confirmed
- **Severity:** CVSS 7.3 High
- **Critical:** No
- **Weakness (CWE):** [CWE-304](https://cwe.mitre.org/data/definitions/304.html) · [CWE-358](https://cwe.mitre.org/data/definitions/358.html)
- **Tags:** [Authentication bypass](https://agentprime.io/advisories/tag/auth-bypass.md) · [CWE-358](https://agentprime.io/advisories/tag/cwe-358.md)
- **Published:** 26 Jun 2026
- **Updated:** 3 Nov 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 26 Jun 2026, 15:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.apache.kerby:kerb-server` (Maven): affected `<2.1.2`; fixed in `2.1.2`

## 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

- 7.3 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0053, the 44th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 26 Jun 2026, 15:32 UTC: [Confirmed by GitHub Advisory Database](https://github.com/advisories/GHSA-262p-fj3f-xh7v)

## Sources

- [GitHub Advisory Database: GHSA-262p-fj3f-xh7v](https://github.com/advisories/GHSA-262p-fj3f-xh7v)
- [OSV: GHSA-262p-fj3f-xh7v](https://osv.dev/vulnerability/GHSA-262p-fj3f-xh7v)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-57915>
- <https://lists.apache.org/thread/1y3glgh3kzwoxo5m2lq504cjlh1dsrfh>
- <http://www.openwall.com/lists/oss-security/2026/06/26/8>
- <https://access.redhat.com/security/cve/CVE-2026-57915>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2493407>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57915.json>
- <https://github.com/apache/directory-kerby/commit/995fa59fac53f8e2e6fb987e0e29a5ae3a4bbf38>
- <https://github.com/apache/directory-kerby/releases/tag/kerby-all-2.1.2>
- <https://github.com/advisories/GHSA-262p-fj3f-xh7v>

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-262p-fj3f-xh7v>, 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-262p-fj3f-xh7v/>. Everything for agents: <https://agentprime.io/llms.txt>.