CVE-2026-78437CWE-459

CVE-2026-78437

High · published September 23, 2026

CVSS v3.1
7.3
EPSS
0%
Percentile
16.7
In the wild
Unconfirmed
What it is

Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail.

This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121.

Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00260 · 16.7th percentile
Weakness
CWE-459 · Incomplete Cleanup
Published
2026-09-23T16:17Z
References (2)
https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg · [email protected]http://www.openwall.com/lists/oss-security/2026/09/23/26 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 25 SEP 03:27Z
    EPSS moved — → 0%
    epss
  • 23 SEP 11:26Z
    Apache Tomcat: HTTP/2 DoS via malformed request
    cvelistv5