# CVE-2026-103884: Keycloak-services: keycloak-services: path traversal in x.509 crl distribution point allows arbitrary local file read

> Attackers can read local files or crash the server via crafted certificates when CRL checking is enabled in Keycloak.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Oct 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-xfh5-8fx4-3crm

## What is CVE-2026-103884?

CVE-2026-103884 is a medium-severity path traversal vulnerability in Red Hat Build of Keycloak, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw was found in the X.509 client certificate authenticator of Keycloak. When CRL Distribution Point checking is enabled, the server fails to properly validate the file paths provided in a client certificate. An attacker can provide a specially crafted certificate that causes the server to attempt to read sensitive files from the local system or exhaust memory by loading extremely large files, potentially leading to information disclosure or a system crash.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-103884?


## How do I fix CVE-2026-103884?

No fix has been published for CVE-2026-103884 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-103884 being exploited?

There is no known exploitation of CVE-2026-103884 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-103884 and fix it if it is affected.

What it is: CVE-2026-103884 is a medium-severity path traversal vulnerability in Red Hat Build of Keycloak, published on 1 Oct 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-2026-103884 in the wild and no public exploit code.

Affected product: Red Hat Build of Keycloak. 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-2026-103884/ (Markdown: https://insights.sbomify.com/CVE-2026-103884/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-103884
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-103884
- OSV: https://osv.dev/vulnerability/CVE-2026-103884

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-103884/
Summaries are generated and may contain mistakes; the official description above is the record.