CVE-2026-87022 Apache Tomcat - Server Side Request Forgery

Apache Tomcat 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, and 9.0.0.M1 through 9.0.121 contain a server side request forgery caused by improper handling of length parameter inconsistency in WebSocket per-message-deflate, letting attackers perform WebSocket message smuggling, exploit requires use of per-message-deflate.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.42% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Server Side Request Forgery
Impact
Server Side Request Forgery
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-130

Vendor fix

Upgrade to versions 11.0.26, 10.1.60, or 9.1.22 or later.

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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