CVE-2026-103119 Apache Tomcat - Buffer Overflow

Apache Tomcat 11.0.0-M25 through 11.0.26 contains a buffer under-read caused by improper handling of large non-blocking writes, letting attackers cause request failures and possible data leakage between responses, exploit requires crafted requests on the same connection.

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

Details

Type
Buffer Overflow
Impact
Information Disclosure, Denial Of Service
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-127

Vendor fix

Upgrade to version 11.0.27.

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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