How severe is CVE-2026-25854?

CVE-2026-25854 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2026-25854?

CVE-2026-25854 affects the following packages: org.apache.tomcat:tomcat-catalina (Maven), org.apache.tomcat:tomcat-catalina (Maven), org.apache.tomcat:tomcat-catalina (Maven), org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat (Maven), org.apache.tomcat.embed:tomcat-embed-core (Maven), org.apache.tomcat.embed:tomcat-embed-core (Maven), and 1 more. Ecosystems affected: Maven.

How do I fix CVE-2026-25854?

Update org.apache.tomcat:tomcat-catalina to 9.0.116 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-25854 is resolved across your whole dependency graph.

How do I detect CVE-2026-25854 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat-catalina, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-25854 if there is no patch (or I can't update yet)?

Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Is CVE-2026-25854 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-25854 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-25854?

CVE-2026-25854 has an EPSS (Exploit Prediction Scoring System) score of 0.6%, placing it in the 48th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-25854?

CVE-2026-25854 is classified as Open Redirect (CWE-601). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-25854 published, and has it been updated?

CVE-2026-25854 was published on April 9, 2026 and was last updated on October 29, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2026-25854 — tomcat-catalina

MEDIUM

CVE-2026-25854 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in org.apache.tomcat:tomcat-catalina. A fix is available for org.apache.tomcat:tomcat-catalina — see the affected versions and patch details below.

Apache Tomcat: Occasionally open redirect

Also known asBIT-tomcat-2026-25854GHSA-9m3c-qcxr-9x87

Published

Apr 9, 2026

Updated

Oct 29, 2026

Affected

9 pkgs

Patched

9 / 9

Exploits

None indexed

Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-25854.

EPSS Exploitation Probability

via FIRST.org ↗

0.6%probability of exploitation in next 30 days

Lower Risk+0.06%

Lower risk than most CVEs48th percentile — riskier than 48% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

9 pkgs affected

☕org.apache.tomcat:tomcat-catalina☕org.apache.tomcat:tomcat-catalina☕org.apache.tomcat:tomcat-catalina☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat.embed:tomcat-embed-core☕org.apache.tomcat.embed:tomcat-embed-core+1 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Occasional URL redirection to untrusted Site ('Open Redirect') vulnerability in Apache Tomcat via the LoadBalancerDrainingValve.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M23 through 9.0.115, from 8.5.30 through 8.5.100. Other, unsupported versions may also be affected

Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.

Affected Packages

9 total 9 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.apache.tomcat:tomcat-catalina`	≥ 8.5.30&&< 9.0.116	9.0.116`org.apache.tomcat:tomcat-catalina:9.0.116`
☕Maven	`org.apache.tomcat:tomcat-catalina`	≥ 10.1.0-M1&&< 10.1.53	10.1.53`org.apache.tomcat:tomcat-catalina:10.1.53`
☕Maven	`org.apache.tomcat:tomcat-catalina`	≥ 11.0.0-M1&&< 11.0.20	11.0.20`org.apache.tomcat:tomcat-catalina:11.0.20`
☕Maven	`org.apache.tomcat:tomcat`	≥ 8.5.30&&< 9.0.116	9.0.116`org.apache.tomcat:tomcat:9.0.116`
☕Maven	`org.apache.tomcat:tomcat`	≥ 10.1.0-M1&&< 10.1.53	10.1.53`org.apache.tomcat:tomcat:10.1.53`
☕Maven	`org.apache.tomcat:tomcat`	≥ 11.0.0-M1&&< 11.0.20	11.0.20`org.apache.tomcat:tomcat:11.0.20`

Affected Products

1 product · 8 configurations

Application

tomcatapache

≥ 11.0.0 && < 11.0.20

1 version

9.0.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat-catalina, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.tomcat:tomcat-catalina to 9.0.116 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-25854 is resolved across your whole dependency graph.
Workarounds
Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatLow

This Low impact vulnerability in Apache Tomcat allows for an open redirect through the LoadBalancerDrainingValve. An attacker could exploit this to redirect users to malicious websites, potentially leading to phishing. This affects Red Hat Enterprise Linux and Red Hat JBoss Web Server when Apache Tomcat is configured…

Workaround published by Red Hat

To mitigate this vulnerability, disable or remove the LoadBalancerDrainingValve configuration from the server.xml file in your Apache Tomcat installation. This valve is typically configured within a <Host> or <Engine> element. After modifying server.xml, restart the Apache Tomcat service for the changes to take effect. This action may impact load balancing functionality if the valve is actively used for draining connections.

Source: Red Hat security advisory for CVE-2026-25854 (CC BY 4.0)

Product	Fixed in	Advisory
Red Hat Enterprise Linux 10	`tomcat9-1:9.0.117-1.el10_2`	RHSA-2026:25341
Red Hat Enterprise Linux 10.0 Extended Update Support	`tomcat9-1:9.0.120-1.el10_0`	RHSA-2026:67163
Red Hat Enterprise Linux 8	`tomcat-1:9.0.120-1.el8_10`	RHSA-2026:68677
Red Hat Enterprise Linux 8.8 Telecommunications Update Service	`tomcat-1:9.0.120-1.el8_8`	RHSA-2026:68680
Red Hat Enterprise Linux 9	`tomcat-1:9.0.117-1.el9_8`	RHSA-2026:26323
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	`tomcat-1:9.0.120-1.el9_2`	RHSA-2026:68678
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	`tomcat-1:9.0.120-1.el9_4`	RHSA-2026:68679
Red Hat Enterprise Linux 9.6 Extended Update Support	`tomcat-1:9.0.120-1.el9_6`	RHSA-2026:68659

Frequently Asked Questions

Occasional URL redirection to untrusted Site ('Open Redirect') vulnerability in Apache Tomcat via the LoadBalancerDrainingValve. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M23 through 9.0.115, from 8.5.30 through 8.5.100. Other, unsupported versions may also be affected Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.

O3 Security · Impact-Aware SCA

Is CVE-2026-25854 in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-601Open Redirect

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Apr 9, 2026

Last updated

Oct 29, 2026

Identifiers

CVE-2026-25854

GHSA-9m3c-qcxr-9x87

BIT-tomcat-2026-25854

References

Advisorygithub.com · CVE 2026 25854.json Advisorylists.apache.org · ghct3b6o74bp2vm7q875s1zh0dqrz3h0 Advisorynvd.nist.gov · CVE 2026 25854 Webopenwall.com Packagegithub.com · tomcat

Related vulnerabilities

This CVE is medium severity; 8 of 8 other CVEs affecting tomcat-catalina are rated as high or higher (top: critical).

CVE-2026-65905CVE-2026-65182CVE-2026-68525CVE-2026-55956CVE-2026-55957CVE-2026-53404CVE-2026-43515CVE-2026-43513

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 29, 2026