CVE-2026-101356CWE-362

CVE-2026-101356

Critical · published October 20, 2026

CVSS v3.1
9.1
EPSS
1%
Percentile
43.2
In the wild
Unconfirmed
What it is

Incorrect object recycling and re-use vulnerability in Apache Tomcat affecting HTTP/2 processing of asynchronous servlets can trigger request and/or response mix-up between users.

This issue affects Apache Tomcat: from 11.0.22 through 11.0.26, from 10.1.55 through 10.1.60, from 9.0.118 through 9.0.122.

Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fixes the issue.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00518 · 43.2th percentile
Weakness
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Published
2026-10-20T18:16Z
References (2)
https://lists.apache.org/thread.html/d1xjt7bbjqw7y7n5mcb4fm815hpfgc27 · [email protected]http://www.openwall.com/lists/oss-security/2026/10/20/27 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 22 OCT 03:28Z
    EPSS moved — → 1%
    epss
  • 20 OCT 13:46Z
    Apache Tomcat: HTTP/2 request/response mix-up after error during async processing
    cvelistv5
  • 20 OCT 13:46Z
    Apache Tomcat: HTTP/2 request/response mix-up after error during async processing
    cvelistv5