CVE-2026-101356 Apache Tomcat - Broken Access Control

Apache Tomcat 11.0.22-11.0.26, 10.1.55-10.1.60, 9.0.118-9.0.122 contains a broken access control caused by incorrect object recycling and re-use in HTTP/2 asynchronous servlet processing, letting attackers cause request/response mix-up between users, exploit requires HTTP/2 asynchronous servlet usage.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published
20 October 2026
Updated
21 October 2026
Weakness
CWE-362

Vendor fix

Upgrade to versions 11.0.27, 10.1.61, or 9.0.123.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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