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CVE-2026-65637 Apache Tomcat

Affected softwareApache Tomcat
Severity9.8 Critical CVSS 3.1
Fixed in11.0.25, 10.1.59, 9.0.121
WeaknessImproper input validation (CWE-20)
Published25 Aug 2026
Updated27 Aug 2026

Published 2 months ago. NVD often adds the list of affected products days or weeks after a CVE is published, and the other sources we check lag too. The scope and status here may change.

Description

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, 10.1.58 or 9.0.121, which fix the issue.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.75% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: apache/tomcat 4001241.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗ CPU 2026-Q4 Oracle Supply Chain / Folders & Files Attachment (Apache Tomcat) (9.3.6)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Supply Chain Folders & Files Attachment (Apache Tomcat) 9.3.6 9.3.6

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.tomcat:tomcat-coyote 11.0.20 11.0.25 unbounded
org.apache.tomcat:tomcat-coyote 10.1.53 10.1.59 unbounded
org.apache.tomcat:tomcat-coyote 9.0.115 9.0.121 unbounded
org.apache.tomcat.embed:tomcat-embed-core 11.0.20 11.0.25 unbounded
org.apache.tomcat.embed:tomcat-embed-core 10.1.53 10.1.59 unbounded
org.apache.tomcat.embed:tomcat-embed-core 9.0.115 9.0.121 unbounded

Products and versions

3 products, 9 version entries
SourceVendorProductSchemeAffected versions
nvd apache tomcat generic ≥ 9.0.115 and < 9.0.121 · ≥ 10.1.53 and < 10.1.58 · ≥ 11.0.20 and < 11.0.25
osv org.apache.tomcat tomcat-coyote generic ≥ 9.0.115 and < 9.0.121 · ≥ 10.1.53 and < 10.1.59 · ≥ 11.0.20 and < 11.0.25
osv org.apache.tomcat.embed tomcat-embed-core generic ≥ 9.0.115 and < 9.0.121 · ≥ 10.1.53 and < 10.1.59 · ≥ 11.0.20 and < 11.0.25

References

URLTags
https://github.com/apache/tomcat/commit/40012414df828a56126f76a7339669c7c919aae7 WEB
https://github.com/apache/tomcat/commit/8639b20f045c88f356b887204f52e897399f0de7 WEB
https://github.com/apache/tomcat/commit/b823e88da077f5fa973e34d72359bded9f621e3c WEB
https://github.com/apache/tomcat PACKAGE
https://github.com/apache/tomcat/releases/tag/10.1.58 WEB
https://github.com/apache/tomcat/releases/tag/11.0.25 WEB
https://github.com/apache/tomcat/releases/tag/9.0.121 WEB
https://lists.apache.org/thread/djog953z1ohsyt25bdvhfzbmsy22vgcj WEB
https://tomcat.apache.org/security-10.html WEB
https://tomcat.apache.org/security-11.html WEB

Timeline

Published2026-08-25By the CVE Program.
NVD record modified2026-08-27NVD's own last-modified date for this record.