CVE-2026-25854: Apache Tomcat open redirect in LoadBalancerDrainingValve

CVE-2026-25854 · Severity: medium · CVSS 6.1 · Published 2026-04-09

Apache Tomcat, a widely used web server and application container, is vulnerable to an open redirect flaw. This issue occurs when the server incorrectly handles certain web requests, allowing attackers to redirect users from a legitimate site to a malicious one. This can be used in phishing campaigns to trick users into providing credentials or downloading malware by making the malicious link appear to come from a trusted domain.

Technologies: Apache Tomcat, org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat-catalina (Maven), org.apache.tomcat.embed:tomcat-embed-core (Maven). Vendors: Apache, Maven.

Quick answers

Is CVE-2026-25854 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-25854 being exploited in the wild.
How severe is CVE-2026-25854?
Medium severity, with a CVSS score of 6.1, published 9 April 2026.
Which products and versions are affected?
org.apache.tomcat:tomcat (Maven) ECOSYSTEM:introduced=8.5.30,fixed=9.0.116; org.apache.tomcat:tomcat-catalina (Maven) ECOSYSTEM:introduced=8.5.30,fixed=9.0.116; org.apache.tomcat.embed:tomcat-embed-core (Maven) ECOSYSTEM:introduced=8.5.30,fixed=9.0.116.
Is there a fix for CVE-2026-25854?
Yes. org.apache.tomcat:tomcat (Maven): upgrade to 9.0.116 or later; org.apache.tomcat:tomcat-catalina (Maven): upgrade to 9.0.116 or later; org.apache.tomcat.embed:tomcat-embed-core (Maven): upgrade to 9.0.116 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-25854 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-25854?
Check whether you run Apache Tomcat, org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat-catalina (Maven) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • org.apache.tomcat:tomcat (Maven): upgrade to 9.0.116 or later
    # set org.apache.tomcat:tomcat to 9.0.116 in your pom.xml or build.gradle
  • org.apache.tomcat:tomcat-catalina (Maven): upgrade to 9.0.116 or later
    # set org.apache.tomcat:tomcat-catalina to 9.0.116 in your pom.xml or build.gradle
  • org.apache.tomcat.embed:tomcat-embed-core (Maven): upgrade to 9.0.116 or later
    # set org.apache.tomcat.embed:tomcat-embed-core to 9.0.116 in your pom.xml or build.gradle

Technical details

An open redirect vulnerability exists in Apache Tomcat's LoadBalancerDrainingValve component. The vulnerability is caused by insufficient validation of user-supplied input used in URL redirection logic within the valve. A remote, unauthenticated attacker can exploit this by crafting a specific URL that, when visited by a victim, redirects them to an arbitrary external domain. This is classified as CWE-601 and requires minimal user interaction. The issue is resolved in versions 11.0.20, 10.1.53, and 9.0.116.

Affected products

  • Apache Tomcat 11.0.0-M1 to 11.0.18, 10.1.0-M1 to 10.1.52, 9.0.0.M23 to 9.0.115, 8.5.30 to 8.5.100

Identifiers

  • CVE-2026-25854
  • GHSA-9m3c-qcxr-9x87

Timeline

  • 2026-04-09: disclosed
  • 2026-04-09: advisory

References

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