Evidence used
- No CISA KEV confirmation is currently recorded.
- The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
- EPSS is 0.24% for the current model date.
BlackTreeCVE IntelligenceApache Software Foundation · Apache Tomcat
Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.
Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Debian trixietrixie · source | tomcat10 | Vendor fix publishedDebian records a fixed source-package version for this release. | 10.1.52-1~deb13u1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian trixietrixie · source | tomcat11 | Vendor fix publishedDebian records a fixed source-package version for this release. | 11.0.15-1~deb13u1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian trixietrixie · source | tomcat9 | Vendor fix publishedDebian records a fixed source-package version for this release. | 9.0.70-2 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian bookwormbookworm · source | tomcat10 | Vendor fix publishedDebian records a fixed source-package version for this release. | 10.1.52-1~deb12u1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian bookwormbookworm · source | tomcat9 | Vendor fix publishedDebian records a fixed source-package version for this release. | 9.0.70-2 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian forkyforky · source | tomcat10 | Vendor fix publishedDebian records a fixed source-package version for this release. | 10.1.52-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian forkyforky · source | tomcat11 | Vendor fix publishedDebian records a fixed source-package version for this release. | 11.0.15-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian forkyforky · source | tomcat9 | Vendor fix publishedDebian records a fixed source-package version for this release. | 9.0.70-2 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian sidsid · source | tomcat10 | Vendor fix publishedDebian records a fixed source-package version for this release. | 10.1.52-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian sidsid · source | tomcat11 | Vendor fix publishedDebian records a fixed source-package version for this release. | 11.0.15-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian sidsid · source | tomcat9 | Vendor fix publishedDebian records a fixed source-package version for this release. | 9.0.70-2 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Ubuntu 24.04 LTSnoble · esm-apps | tomcat10 | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 5 Oct 2026 |
| Ubuntu 24.04 LTSnoble · esm-apps | tomcat9 | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 5 Oct 2026 |
These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.
| Ecosystem and package | Affected range | First fixed version | Evidence |
|---|---|---|---|
| Mavenorg.apache.tomcat.embed:tomcat-embed-core | ECOSYSTEM: introduced 11.0.0-M1; fixed 11.0.15 | 11.0.15 | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat.embed:tomcat-embed-core | ECOSYSTEM: introduced 10.1.0-M1; fixed 10.1.50 | 10.1.50 | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat.embed:tomcat-embed-core | ECOSYSTEM: introduced 9.0.0-M1; fixed 9.0.113 | 9.0.113 | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat.embed:tomcat-embed-core | ECOSYSTEM: introduced 8.5.0; last affected 8.5.100 | Not stated | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat:tomcat | ECOSYSTEM: introduced 11.0.0-M1; fixed 11.0.15 | 11.0.15 | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat:tomcat | ECOSYSTEM: introduced 10.1.0-M1; fixed 10.1.50 | 10.1.50 | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat:tomcat | ECOSYSTEM: introduced 9.0.0-M1; fixed 9.0.113 | 9.0.113 | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat:tomcat | ECOSYSTEM: introduced 8.5.0; last affected 8.5.100 | Not stated | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat:tomcat-coyote | ECOSYSTEM: introduced 11.0.0-M1; fixed 11.0.15 | 11.0.15 | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat:tomcat-coyote | ECOSYSTEM: introduced 10.1.0-M1; fixed 10.1.50 | 10.1.50 | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat:tomcat-coyote | ECOSYSTEM: introduced 9.0.0-M1; fixed 9.0.113 | 9.0.113 | OSV record ↗aggregator derived · 11 Sep 2026 |
| Mavenorg.apache.tomcat:tomcat-coyote | ECOSYSTEM: introduced 8.5.0; last affected 8.5.100 | Not stated | OSV record ↗aggregator derived · 11 Sep 2026 |
| mavenorg.apache.tomcat.embed:tomcat-embed-core | >= 11.0.0-M1, < 11.0.15 | 11.0.15 | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat.embed:tomcat-embed-core | >= 10.1.0-M1, < 10.1.50 | 10.1.50 | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat.embed:tomcat-embed-core | >= 9.0.0-M1, < 9.0.113 | 9.0.113 | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat.embed:tomcat-embed-core | >= 8.5.0, <= 8.5.100 | Not stated | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat:tomcat | >= 11.0.0-M1, < 11.0.15 | 11.0.15 | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat:tomcat | >= 10.1.0-M1, < 10.1.50 | 10.1.50 | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat:tomcat | >= 9.0.0-M1, < 9.0.113 | 9.0.113 | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat:tomcat | >= 8.5.0, <= 8.5.100 | Not stated | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat:tomcat-coyote | >= 11.0.0-M1, < 11.0.15 | 11.0.15 | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat:tomcat-coyote | >= 10.1.0-M1, < 10.1.50 | 10.1.50 | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat:tomcat-coyote | >= 9.0.0-M1, < 9.0.113 | 9.0.113 | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
| mavenorg.apache.tomcat:tomcat-coyote | >= 8.5.0, <= 8.5.100 | Not stated | GitHub advisory ↗github reviewed aggregator · 31 Aug 2026 |
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
The vendor explicitly identifies these products as affected by this CVE.
The vendor explicitly identifies these products as affected by this CVE.
Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.
Patch availableImproper Input Validation vulnerability. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0-M1 through 9.0.112. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Older EOL versions are not affected. Tomcat did not validate that the host name provided via the SNI extension was the same as the host name provided in the HTTP host header field. If Tomcat was configured with more than one virtual host and the TLS configuration for one of those hosts did not require client certificate authentication but another one did, it was possible for a client to bypass the client certificate authentication by sending different host names in the SNI extension and the HTTP host header field. The vulnerability only applies if client certificate authentication is only enforced at the Connector. It does not apply if client certificate authentication is enforced at the web application. Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fix the issue.
Improper Input Validation vulnerability. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0-M1 through 9.0.112. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Older EOL versions are not affected. Tomcat did not validate that the host name provided via the SNI extension was the same as the host name provided in the HTTP host header field. If Tomcat was configured with more than one virtual host and the TLS configuration for one of those hosts did not require client certificate authentication but another one did, it was possible for a client to bypass the client certificate authentication by sending different host names in the SNI extension and the HTTP host header field. The vulnerability only applies if client certificate authentication is only enforced at the Connector. It does not apply if client certificate authentication is enforced at the web application. Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fix the issue.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
Improper Input Validation vulnerability. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0-M1 through 9.0.112. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Older EOL versions are not affected. Tomcat did not validate that the host name provided via the SNI extension was the same as the host name provided in the HTTP host header field. If Tomcat was configured with more than one virtual host and the TLS configuration for one of those hosts did not require client certificate authentication but another one did, it was possible for a client to bypass the client certificate authentication by sending different host names in the SNI extension and the HTTP host header field. The vulnerability only applies if client certificate authentication is only enforced at the Connector. It does not apply if client certificate authentication is enforced at the web application. Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fix the issue.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
CWE-20: Improper Input Validation. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
Operational remediation based on structured source evidence.
Published 17 Feb 2026 · Last source change 24 Mar 2026, 09:46 UTC · CWE-20 · Improper Input Validation
Core structured fields are present and their contributing authorities are shown above.