--- id: CVE-2026-41293 title: >- tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293) summary: >- Apache Tomcat did not validate HTTP/2 request headers, triggering unexpected application behavior, as applications may presume that header values exposed through the Servlet API would be valid. severity: high cvss: 7.3 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L' cvssSource: vendor cwe: - CWE-1286 - CWE-20 vendor: Red Hat product: Red Hat Enterprise Linux AppStream EUS (v. 10.0) affected: - enterprise_linux 6 - enterprise_linux 8 - enterprise_linux 9 - jboss_web_server 5 - jboss_web_server_6_2_on_rhel 10 - jboss_web_server_7_0_on_rhel 10 - jboss_web_server_6_2_on_rhel 8 - jboss_web_server_7_0_on_rhel 8 - jboss_web_server_6_2_on_rhel 9 - jboss_web_server_7_0_on_rhel 9 - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_e4s_v_8_8 - enterprise_linux_appstream_tus_v_8_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_e4s_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - jboss_web_server 6.2.4 - jboss_web_server 7.0.0 patched: - jboss_web_server_6_2_on_rhel 10 - jboss_web_server_7_0_on_rhel 10 - jboss_web_server_6_2_on_rhel 8 - jboss_web_server_7_0_on_rhel 8 - jboss_web_server_6_2_on_rhel 9 - jboss_web_server_7_0_on_rhel 9 - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_e4s_v_8_8 - enterprise_linux_appstream_tus_v_8_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_e4s_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - jboss_web_server 6.2.4 - jboss_web_server 7.0.0 published: '2026-05-12' updated: '2026-09-21' sourceUpdated: '2026-09-21T17:17:08+00:00' source: CSAF sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41293.json' references: - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41293.json - url: 'https://access.redhat.com/security/cve/CVE-2026-41293' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2476513' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-41293' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-41293' - url: 'https://lists.apache.org/thread/qwg0q16z7xkb2qrr853wdll5531mvl1r' - url: 'https://access.redhat.com/errata/RHSA-2026:43401' - url: 'https://access.redhat.com/errata/RHSA-2026:39188' - url: 'https://access.redhat.com/errata/RHSA-2026:67164' - url: 'https://access.redhat.com/errata/RHSA-2026:67163' - url: 'https://access.redhat.com/errata/RHSA-2026:69259' - url: 'https://access.redhat.com/errata/RHSA-2026:68651' - url: 'https://access.redhat.com/errata/RHSA-2026:68677' - url: 'https://access.redhat.com/errata/RHSA-2026:68680' - url: 'https://access.redhat.com/errata/RHSA-2026:68678' - url: 'https://access.redhat.com/errata/RHSA-2026:68679' - url: 'https://access.redhat.com/errata/RHSA-2026:68659' - url: 'https://access.redhat.com/errata/RHSA-2026:68660' - url: 'https://access.redhat.com/errata/RHSA-2026:43402' - url: 'https://access.redhat.com/errata/RHSA-2026:39189' tags: - csaf - vex - red-hat - exploit-available - cve.org - score-dispute epss: 0.0168 epssPercentile: 0.75939 exploits: github: 1 githubRepos: - 'https://github.com/xiaoqiMikko/tomcat-check' checkedAt: '2026-09-24T07:53:03.236Z' exploitAvailable: true ssvc: exploitation: none automatable: 'yes' technicalImpact: total timestamp: '2026-05-14T16:40:13.006509Z' scores: vendor: 7.3 adp: 9.8 ingestedAt: '2026-09-17T19:26:25.352Z' --- ## Overview Apache Tomcat did not validate HTTP/2 request headers, triggering unexpected application behavior, as applications may presume that header values exposed through the Servlet API would be valid. ## Vendor advisories - **RHSA-2026:43401** · Red Hat · fixed in: Red Hat JBoss Web Server 6.2 on RHEL 10, Red Hat JBoss Web Server 6.2 on RHEL 8, Red Hat JBoss Web Server 6.2 on RHEL 9 · released 2026-07-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:43401) - **RHSA-2026:39188** · Red Hat · fixed in: Red Hat JBoss Web Server 7.0 on RHEL 10, Red Hat JBoss Web Server 7.0 on RHEL 8, Red Hat JBoss Web Server 7.0 on RHEL 9 · released 2026-07-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:39188) - **RHSA-2026:67164** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67164) - **RHSA-2026:67163** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67163) - **RHSA-2026:69259** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69259) - **RHSA-2026:68651** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68651) - **RHSA-2026:68677** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68677) - **RHSA-2026:68680** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68680) - **RHSA-2026:68678** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68678) - **RHSA-2026:68679** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68679) - **RHSA-2026:68659** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68659) - **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat JBoss Web Server 5 · no fix planned: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41293.json) - **RHSA-2026:68660** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68660) **tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated** — rated Moderate by Red Hat. Released 2026-05-12, updated 2026-09-21. Affected: - Red Hat Enterprise Linux 6 - Red Hat Enterprise Linux 8 - Red Hat Enterprise Linux 9 - Red Hat JBoss Web Server 5 Fixed: - Red Hat JBoss Web Server 6.2 on RHEL 10 - Red Hat JBoss Web Server 7.0 on RHEL 10 - Red Hat JBoss Web Server 6.2 on RHEL 8 - Red Hat JBoss Web Server 7.0 on RHEL 8 - Red Hat JBoss Web Server 6.2 on RHEL 9 - Red Hat JBoss Web Server 7.0 on RHEL 9 - Red Hat Enterprise Linux AppStream EUS (v. 10.0) - Red Hat Enterprise Linux AppStream (v. 10) - Red Hat Enterprise Linux AppStream (v. 8) - Red Hat Enterprise Linux AppStream E4S (v.8.8) - Red Hat Enterprise Linux AppStream TUS (v.8.8) - Red Hat Enterprise Linux AppStream E4S (v.9.2) - Red Hat Enterprise Linux AppStream E4S (v.9.4) - Red Hat Enterprise Linux AppStream EUS (v.9.6) - Red Hat Enterprise Linux AppStream (v. 9) - Red Hat JBoss Web Server 6.2.4 - Red Hat JBoss Web Server 7.0.0 No fix planned: - Red Hat Enterprise Linux 8 - Red Hat Enterprise Linux 9 - Red Hat Enterprise Linux 6 Not affected: - Red Hat JBoss Web Server 7.0 on RHEL 10 - Red Hat JBoss Web Server 7.0 on RHEL 8 - Red Hat JBoss Web Server 7.0 on RHEL 9 - Red Hat Enterprise Linux 7 - Red Hat Hardened Images ## Remediation Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:43401 Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:39188 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:67164