CVE-2026-65637

⛔ critical

Summary

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.

CVSS Score

9.8

Critical

EPSS Score

0.8

Exploit Probability

Published Date

2026-08-25

First Seen: 2026-08-26

📊 Relative Risk Intelligence

This CVE is Very High Risk - more severe than 90.6% of all 365,890 vulnerabilities in our database.

#34,455

Top 10% most severe

Severity Percentile

🎯 CISA SSVC Assessment Updated: Aug 26, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Total

Complete system compromise possible

🏆 Discovered By

Parag Ambildhuke (https://github.com/paragxa)

SSVC data provided by CISA

Last Modified 2026-08-27

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE IDs (Weakness Types)

CWE-20

📦 Affected Products 3

Vendor	Product	Status	Affected Versions
apache	tomcat	Affected	> 10.1.53 < 10.1.58
apache	tomcat	Affected	> 11.0.20 < 11.0.25
apache	tomcat	Affected	> 9.0.115 < 9.0.121

🔗 References 1

https://lists.apache.org/thread/djog953z1ohsyt25bdvh...

Vendor Advisory Mailing List

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-65182	⛔ critical	9.1	0.6	Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint bypass if a...	2026-08-25
CVE-2026-65183	⚠️ high	8.1	0.5	Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat when creating unix domain sockets allow...	2026-08-25
CVE-2026-65905	⛔ critical	9.8	0.8	Authentication Bypass by Capture-replay vulnerability in Apache Tomcat's DIGEST authenticator. If, before windowSize req...	2026-08-25
CVE-2026-65927	⚠️ high	7.5	0.8	Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing t...	2026-08-25
CVE-2026-66422	⚠️ high	8.1	0.6	Improper Authorization vulnerability in Apache Tomcat cause by security-role-ref definitions being incorrectly used as r...	2026-08-25
CVE-2026-68525	⛔ critical	9.1	0.6	Incorrect Authorization vulnerability in Apache Tomcat's FORM authentication process allows the bypassing of a security ...	2026-08-25

These CVEs affect the same products