by Kastro
Paper/Archive/CVE-2026-41293

CVE-2026-41293

Apache Software Foundation Apache Tomcat — Apache Tomcat: HTTP/2 request headers not validated

EPSS 2%CVSS 9.8
critical.is priorityof 100
45
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 77.3.773 × 2015.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Improper Input Validation vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 10.0.0-M1 through 10.0.27. Older, end of support versions may also be affected. Users are recommended to upgrade to version [FIXED_VERSION], which fixes the issue.

Affected

ProductAffectedFixed inSource
Apache Tomcat11.0.0-M1 – 11.0.21–CNA
Apache Tomcat10.1.0-M1 – 10.1.54–CNA
Apache Tomcat9.0.0.M1 – 9.0.117–CNA
Apache Tomcat10.0.0-M1 – 10.0.27–CNA
Apache Tomcat8.5.0 – 8.5.100–CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorylists.apache.org/thread/qwg0q16z7xkb2qrr853wdll5531mvl1rrefopenwall.com/lists/oss-security/2026/05/12/13