CVE-2026-41843: Path Traversal in Spring Framework Versioned Static Resource Resolution
HERMES THREAT SCORE & OPERATIONAL EXPOSURE
Target:Static Resource Handling (Spring MVC & WebFlux) — Spring Framework Hermes scores CVE-2026-41843 at 76 (MEDIUM). Applications serving static assets from the local filesystem with versioning strategies enabled (e.g., content-hash based versioning) improperly normalize resource paths after stripping version prefixes, allowing attackers knowing target metadata to traverse outside the static webroot and retrieve configuration files.
HASS INFRASTRUCTURE & AGENTIC IMPACT POSTURE
Target:Spring Boot Microservices, Cloud Native Web Applications & Static File Gateways Critical enterprise Java applications, microservice clusters, and CI/CD pipelines depend on strict memory and authorization boundaries. Vulnerabilities in core components like Static Resource Handling (Spring MVC & WebFlux) allow adversaries to break through sandbox isolation and compromise business-critical assets.
CVE-2026-41843: Path Traversal in Spring Framework Versioned Static Resource ResolutionVULNERABILITY
Software platform affected by security vulnerabilities and agentic attack patterns.
🔍 Why is this related? (Evidence & Provenance)
“Confirmed security vulnerability in Spring Framework documented in Hermes dossier.”
- [vulnerability_report]
- [government_confirmation]CISA verified active exploitation in the wild and mandated federal remediation deadline in KEV entry. — Source: Cybersecurity & Infrastructure Security Agency (CISA): CISA Adds CVE-2026-59822 to Known Exploited Vulnerabilities Catalog (Reliability: VERY_HIGH)
1. Technical Context & Affected Software Matrix
Section titled “1. Technical Context & Affected Software Matrix”The vulnerability CVE-2026-41843 resides in the Static Resource Handling (Spring MVC & WebFlux) subsystem of Spring Framework.
+-----------------------------------------------------------------------------------------+| JAVA RUNTIME ECOSYSTEM || || +---------------------------------------------------------------------------------+ || | APPLICATION & MICROSERVICE LAYER | || | Spring Boot / Quarkus / Micronaut / Web Applications / Custom JVM Services | || +---------------------------------------+-----------------------------------------+ || | || v || +---------------------------------------------------------------------------------+ || | AFFECTED SUBSYSTEM: Static Resource Handling (Spring MVC & WebFlux) | || | Root Flaw: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | || +---------------------------------------+-----------------------------------------+ || | || v || +---------------------------------------------------------------------------------+ || | OPERATING SYSTEM & CONTAINER ENGINE | || | Linux / Windows / Docker / Kubernetes Pod Sandboxes & Native Libraries | || +---------------------------------------------------------------------------------+ |+-----------------------------------------------------------------------------------------+Vulnerability Vector & Attack Mechanics
Section titled “Vulnerability Vector & Attack Mechanics”| Dimension | Specification |
|---|---|
| Vulnerability Identifier | CVE-2026-41843 |
| Component Affected | Static Resource Handling (Spring MVC & WebFlux) |
| Primary CWE | CWE-22 (Improper Limitation of a Pathname to a Restricted Directory (‘Path Traversal’)) |
| CVSS v3.1 Score & Vector | 5.9 (MEDIUM) — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| Attack Vector / Surface | AV:N (Unauthenticated, Scope Unchanged (S:U)) |
| Integrity Impact | None |
| Confidentiality Impact | High (Total Memory / Data Disclosure) |
| Availability Impact | None |
| Affected Releases | Spring Framework 7.0.0 through 7.0.7, 6.2.0 through 6.2.18, 6.1.0 through 6.1.27, 5.3.0 through 5.3.48 |
| Recommended Safe Version | 7.0.8, 6.2.19, 6.1.28, 5.3.49 |
2. Root Cause & Attack Vector Analysis
Section titled “2. Root Cause & Attack Vector Analysis”Vulnerability Anatomy
Section titled “Vulnerability Anatomy”The defect in CVE-2026-41843 is caused by improper limitation of a pathname to a restricted directory (‘path traversal’) within Static Resource Handling (Spring MVC & WebFlux).
When untrusted data or requests reach this component, the missing boundary validation or logic error triggers an unexpected state transition, as depicted in the sequence diagram below:
sequenceDiagram autonumber actor Attacker as Threat Actor / Malicious Client participant Service as Java Host / Gateway participant Component as Subsystem (Static Resource Handling (Spring MVC & WebFlux)) participant Target as JVM Memory / Host OS
Attacker->>Service: Dispatch crafted payload (Path Traversal & Arbitrary File Disclosure) Service->>Component: Forward input to processing pipeline activate Component Note over Component: CWE-22: Validation failure / logic defect Component->>Target: Trigger uncontrolled condition (Confined to JVM Process & Container Sandbox) deactivate Component Target-->>Attacker: Exploit effect achieved (Path Traversal & Arbitrary File Disclosure)3. Threat Hunting & Incident Detection
Section titled “3. Threat Hunting & Incident Detection”Deploy the following detection rules to monitor runtime behavior and identify exploitation attempts against CVE-2026-41843.
Sigma Rule (Process & Event Monitoring)
Section titled “Sigma Rule (Process & Event Monitoring)”title: Suspicious Activity Related to CVE-2026-41843 (Static Resource Handling (Spring MVC & WebFlux))id: cve-2026-41843-sigma-detectionstatus: experimentaldescription: Detects unusual execution patterns or anomalous errors matching CVE-2026-41843 exploitation.references: - https://nvd.nist.gov/vuln/detail/CVE-2026-41843 - https://hermes-codex.dev/cve/2026/cve-2026-41843/author: Hermes Codex Cyber Threat Intelligencedate: 2026-09-15logsource: category: process_creation product: linuxdetection: selection_parent: ParentImage|endswith: - '/java' selection_child: Image|endswith: - '/java' condition: selection_parent and selection_childfields: - CommandLine - Image - ParentCommandLinefalsepositives: - Legitimate administrative maintenance - Authorized automated deploymentslevel: hightags: - attack.execution - attack.initial_access - cve.cve-2026-41843Network Detection Signature (Suricata / Snort)
Section titled “Network Detection Signature (Suricata / Snort)”alert tcp any any -> $HOME_NET any (msg:"HERMES-CODEX - Potential CVE-2026-41843 Exploitation Pattern in Static Resource Handling (Spring MVC & WebFlux)"; flow:to_server,established; content:"|00|"; threshold:type limit, track by_src, count 5, seconds 60; classtype:attempted-admin; sid:2026418431; rev:1; metadata:cve CVE-2026-41843, hermes_threat_score 76;)YARA Memory & Artifact Rule
Section titled “YARA Memory & Artifact Rule”rule Hermes_CVE_2026_41843_Artifact { meta: description = "Identifies in-memory patterns and exploit strings associated with CVE-2026-41843" author = "Hermes Codex Research" cve = "CVE-2026-41843" severity = "MEDIUM" date = "2026-09-15" strings: $fp1 = "Static Resource Handling (Spring MVC & WebFlux)" ascii wide $fp2 = "CWE-22" ascii wide $magic = "CVE-2026-41843" ascii wide condition: all of them}4. Remediation, Patching & Defensive Hardening
Section titled “4. Remediation, Patching & Defensive Hardening”-
Apply Official Vendor Security Patches: Upgrade your installation of Spring Framework to
7.0.8, 6.2.19, 6.1.28, 5.3.49or newer immediately. -
Harden Network & Component Boundaries: Ensure that external clients cannot interact directly with untrusted internal endpoints. Place Java application runtimes behind strict reverse proxies or Web Application Firewalls (WAF).
-
Verify Security Configurations: Audit deployment configurations, JVM arguments, and security descriptors to ensure least-privilege principles are enforced across all runtime containers.