CVE-2026-101356

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

At a glance

Severity: CRITICAL 9.1
EPSS: EPSS 0.50 % · percentile 43 (2026-10-27)
State: PUBLISHED
Published: 2026-10-20
Updated: 2026-10-20
Assigner: apache
NVD status: Awaiting Analysis

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	CRITICAL 9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	CISA-ADP
CVSS 3.1	CRITICAL 9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Weaknesses (CWE)

CWE-362

European references

ENISA EUVD · EUVD-2026-105011
GCVE · GCVE-0-2026-101356

CERT-FR advisories

CERTFR-2026-AVI-1358 — Multiples vulnérabilités dans Apache Tomcat · cert.ssi.gouv.fr

Affected products

Product	Versions
Apache Software Foundation · Apache Tomcat	affected 11.0.22 ≤ 11.0.26 ; affected 10.1.55 ≤ 10.1.60 ; affected 9.0.118 ≤ 9.0.122

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD