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Critical, CVSS 9.8amended

Apache Tomcat - HTTP/2 no-authority bypass of strict SNI validation

CVE-2026-65637GHSA-f525-44xv-f2qj

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.apache.tomcat:tomcat-coyote 11.0.25, 10.1.59, 9.0.121; org.apache.tomcat.embed:tomcat-embed-core 11.0.25, 10.1.59, 9.0.121; tomcat 11.0.25, 10.1.58, 9.0.121), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Maven org.apache.tomcat:tomcat-coyote

    Affected
    >= 11.0.20, < 11.0.25>= 10.1.53, < 10.1.59>= 9.0.115, < 9.0.121
    Fixed in
    10.1.59, 11.0.25, 9.0.121

  • Maven org.apache.tomcat.embed:tomcat-embed-core

    Affected
    >= 11.0.20, < 11.0.25>= 10.1.53, < 10.1.59>= 9.0.115, < 9.0.121
    Fixed in
    10.1.59, 11.0.25, 9.0.121

  • Bitnami tomcat

    Affected
    >= 9.0.115, < 9.0.121>= 10.1.53, < 10.1.58>= 11.0.20, < 11.0.25
    Fixed in
    11.0.25, 9.0.121, 10.1.58

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
9.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
  • CVE-2026-65637: 0.75% estimated exploitation activity in the next 30 days; percentile 55.03 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990. This issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 10.1.53 through 10.1.57, from 9.0.115 through 9.0.120. Users are recommended to upgrade to version 11.0.25, 10.1.59 or 9.0.121, which fix the issue.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from osv record BIT-tomcat-2026-65637

  2. Revision 2 · amended ·

    Amended from osv record GHSA-f525-44xv-f2qj

  3. Revision 1 · created ·

    Published from ghsa record GHSA-f525-44xv-f2qj

Agent brief

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# Patch Next advisory brief: CVE-2026-65637

Advisory: Apache Tomcat - HTTP/2 no-authority bypass of strict SNI validation
IDs: CVE-2026-65637, GHSA-f525-44xv-f2qj
Record: https://patchnext.com/advisories/cve-2026-65637 (revision 3, source checked 28 Oct 2026, 06:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.apache.tomcat:tomcat-coyote 11.0.25, 10.1.59, 9.0.121; org.apache.tomcat.embed:tomcat-embed-core 11.0.25, 10.1.59, 9.0.121; tomcat 11.0.25, 10.1.58, 9.0.121. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.tomcat:tomcat-coyote: affected >= 11.0.20, < 11.0.25; >= 10.1.53, < 10.1.59; >= 9.0.115, < 9.0.121; fixed in 10.1.59, 11.0.25, 9.0.121
- Maven org.apache.tomcat.embed:tomcat-embed-core: affected >= 11.0.20, < 11.0.25; >= 10.1.53, < 10.1.59; >= 9.0.115, < 9.0.121; fixed in 10.1.59, 11.0.25, 9.0.121
- Bitnami tomcat: affected >= 9.0.115, < 9.0.121; >= 10.1.53, < 10.1.58; >= 11.0.20, < 11.0.25; fixed in 11.0.25, 9.0.121, 10.1.58

## Suggested inspection (read-only)
- Maven org.apache.tomcat:tomcat-coyote: check the installed version with your package manager.
- Maven org.apache.tomcat.embed:tomcat-embed-core: check the installed version with your package manager.
- Bitnami tomcat: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.apache.tomcat:tomcat-coyote, org.apache.tomcat.embed:tomcat-embed-core, tomcat.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-f525-44xv-f2qj (GitHub-reviewed advisory GHSA-f525-44xv-f2qj lists affected ranges: Maven org.apache.tomcat:tomcat-coyote >=11.0.20 =10.1.53 =9.0.115 =11.0.20 =10.1.53 =9.0.115 <9.0.121)
- Verified: https://osv.dev/vulnerability/GHSA-f525-44xv-f2qj (OSV record GHSA-f525-44xv-f2qj lists affected ranges: Maven org.apache.tomcat:tomcat-coyote >=11.0.20 =10.1.53 =9.0.115 =11.0.20 =10.1.53 =9.0.115 <9.0.121 (fixed))
- Verified: https://osv.dev/vulnerability/BIT-tomcat-2026-65637 (OSV record BIT-tomcat-2026-65637 lists affected ranges: Bitnami tomcat >=9.0.115 =10.1.53 =11.0.20 <11.0.25 (fixed))

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