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 2.65% for the current model date.
BlackTreeCVE IntelligenceApache Software Foundation · Apache Tomcat
Official source article: Siemens SSA-784301 ↗. Check the applicable product and release in the original source.
High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
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. | 10.1.16-1 | Debian Security Tracker ↗Source updated 5 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 5 Oct 2026 |
| Debian bookwormbookworm · source | tomcat10 | Vendor fix publishedDebian records a fixed source-package version for this release. | 10.1.6-1+deb12u2 | Debian Security Tracker ↗Source updated 5 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 5 Oct 2026 |
| Debian forkyforky · source | tomcat10 | Vendor fix publishedDebian records a fixed source-package version for this release. | 10.1.16-1 | Debian Security Tracker ↗Source updated 5 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 5 Oct 2026 |
| Debian sidsid · source | tomcat10 | Vendor fix publishedDebian records a fixed source-package version for this release. | 10.1.16-1 | Debian Security Tracker ↗Source updated 5 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 5 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | tomcat9 | Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree. | 9.0.70-2ubuntu0.1 | 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 11.0.0-M11 | 11.0.0-M11 | OSV record ↗aggregator derived · 2 Oct 2026 |
| Mavenorg.apache.tomcat.embed:tomcat-embed-core | ECOSYSTEM: introduced 10.1.0-M1; fixed 10.1.16 | 10.1.16 | OSV record ↗aggregator derived · 2 Oct 2026 |
| Mavenorg.apache.tomcat.embed:tomcat-embed-core | ECOSYSTEM: introduced 9.0.0-M1; fixed 9.0.83 | 9.0.83 | OSV record ↗aggregator derived · 2 Oct 2026 |
| Mavenorg.apache.tomcat.embed:tomcat-embed-core | ECOSYSTEM: introduced 8.5.0; fixed 8.5.96 | 8.5.96 | OSV record ↗aggregator derived · 2 Oct 2026 |
| Mavenorg.apache.tomcat:tomcat-catalina | ECOSYSTEM: introduced 11.0.0-M1; fixed 11.0.0-M11 | 11.0.0-M11 | OSV record ↗aggregator derived · 2 Oct 2026 |
| Mavenorg.apache.tomcat:tomcat-catalina | ECOSYSTEM: introduced 10.1.0-M1; fixed 10.1.16 | 10.1.16 | OSV record ↗aggregator derived · 2 Oct 2026 |
| Mavenorg.apache.tomcat:tomcat-catalina | ECOSYSTEM: introduced 9.0.0-M1; fixed 9.0.83 | 9.0.83 | OSV record ↗aggregator derived · 2 Oct 2026 |
| Mavenorg.apache.tomcat:tomcat-catalina | ECOSYSTEM: introduced 8.5.0; fixed 8.5.96 | 8.5.96 | OSV record ↗aggregator derived · 2 Oct 2026 |
| Mavenorg.apache.tomcat:tomcat-coyote | ECOSYSTEM: introduced 11.0.0-M1; fixed 11.0.0-M11 | 11.0.0-M11 | OSV record ↗aggregator derived · 2 Oct 2026 |
| mavenorg.apache.tomcat.embed:tomcat-embed-core | >= 11.0.0-M1, < 11.0.0-M11 | 11.0.0-M11 | GitHub advisory ↗github reviewed aggregator · 2 Oct 2026 |
| mavenorg.apache.tomcat.embed:tomcat-embed-core | >= 10.1.0-M1, < 10.1.16 | 10.1.16 | GitHub advisory ↗github reviewed aggregator · 2 Oct 2026 |
| mavenorg.apache.tomcat.embed:tomcat-embed-core | >= 9.0.0-M1, < 9.0.83 | 9.0.83 | GitHub advisory ↗github reviewed aggregator · 2 Oct 2026 |
| mavenorg.apache.tomcat.embed:tomcat-embed-core | >= 8.5.0, < 8.5.96 | 8.5.96 | GitHub advisory ↗github reviewed aggregator · 2 Oct 2026 |
| mavenorg.apache.tomcat:tomcat-catalina | >= 11.0.0-M1, < 11.0.0-M11 | 11.0.0-M11 | GitHub advisory ↗github reviewed aggregator · 2 Oct 2026 |
| mavenorg.apache.tomcat:tomcat-catalina | >= 10.1.0-M1, < 10.1.16 | 10.1.16 | GitHub advisory ↗github reviewed aggregator · 2 Oct 2026 |
| mavenorg.apache.tomcat:tomcat-catalina | >= 9.0.0-M1, < 9.0.83 | 9.0.83 | GitHub advisory ↗github reviewed aggregator · 2 Oct 2026 |
| mavenorg.apache.tomcat:tomcat-catalina | >= 8.5.0, < 8.5.96 | 8.5.96 | GitHub advisory ↗github reviewed aggregator · 2 Oct 2026 |
| mavenorg.apache.tomcat:tomcat-coyote | >= 11.0.0-M1, < 11.0.0-M11 | 11.0.0-M11 | GitHub advisory ↗github reviewed aggregator · 2 Oct 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.
High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Fix availability varies by productImproper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82 and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.
Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82 and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
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 in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82 and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
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-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'). The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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 28 Nov 2023 · Last source change 29 Oct 2025, 12:00 UTC · CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Core structured fields are present and their contributing authorities are shown above.