CVE-2026-86350 Security Details

CVE ID

CVE-2026-86350

CWE

CWE-444

CVE Description

Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a regression in fix for CVE-2026-41293 can trigger request header mix-up. This issue affects Apache Tomcat: from 11.0.22 through 11.0.25, from 10.1.55 through 10.1.59, from 9.0.118 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.

Published

Sep 24, 2026

CVSS Score & Severity

9.3Critical

CVSS Vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

EPSS Score

0.483%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

org/apache/coyote/http2/HpackDecoder.readHpackString(Ljava/nio/ByteBuffer;Z)Ljava/lang/String;

JVMVulnerable params: 0

Affected Ecosystems

affected

Source

National Vulnerability Database

References

Apache · AnnouncementPROJECT