Paper/Archive/CVE-2026-86350

CVE-2026-86350

Apache Software Foundation Apache Tomcat — Apache Tomcat: Regression in fix for CVE-2026-41293 can trigger request header mix-up

EPSS 0.5%CVSS 9.1

critical.is priorityof 100

CVSS 9.1 (ADP)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 41.7.417 × 208.3 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

Apache Tomcat11.0.22 – 11.0.25–CNA

Apache Tomcat10.1.55 – 10.1.59–CNA

Apache Tomcat9.0.118 – 9.0.121–CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorylists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswc