All vulnerabilities
CVE-2026-101356

Apache Tomcat: HTTP/2 request/response mix-up after error during async processing

Apache Software Foundation Apache TomcatWeb servers
Open in ThreatlineRecord JSON
CVSS
9.1Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.52%Chance of exploitation activity in the next 30 days, higher than 43% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published20 Oct 2026Updated 20 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

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.

Text from CVE List

Affected versions 3

  • Apache Tomcataffected: 11.0.22 through 11.0.26CVE List
  • Apache Tomcataffected: 10.1.55 through 10.1.60CVE List
  • Apache Tomcataffected: 9.0.118 through 9.0.122CVE List

References 1