# CVE-2026-57915: Apache Kerby: Kerberos Pre-Authentication Bypass

> Attackers can bypass Kerberos pre-authentication by sending unsupported PA-DATA types, allowing unauthorized access to systems using Apache Kerby.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Jun 2026
- **Updated:** 3 Aug 2026
- **Also known as:** GHSA-262p-fj3f-xh7v

## What is CVE-2026-57915?

CVE-2026-57915 is a high-severity authentication bypass vulnerability in Apache Kerby, published on 26 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

It is possible to bypass the Kerberos pre-authentication check in Apache Kerby by sending a PA-DATA with an unrecognized or unsupported type. Users are recommended to upgrade to version 2.1.2, which fixes this issue.

Weakness: CWE-358 (Improperly Implemented Security Check for Standard), CWE-304 (Missing Critical Step in Authentication)

## Which versions are affected by CVE-2026-57915?


## How do I fix CVE-2026-57915?

No fix has been published for CVE-2026-57915 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-57915 being exploited?

There is no known exploitation of CVE-2026-57915 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57915 and fix it if it is affected.

What it is: CVE-2026-57915 is a high-severity authentication bypass vulnerability in Apache Kerby, published on 26 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-57915 in the wild and no public exploit code.

Affected product: Apache Kerby. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-57915/ (Markdown: https://insights.sbomify.com/CVE-2026-57915/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57915
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57915
- OSV: https://osv.dev/vulnerability/CVE-2026-57915

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57915/
Summaries are generated and may contain mistakes; the official description above is the record.