CVE-2026-40973: Spring Framework Spring Boot Accepts Predictable Temp Vulnerability

HIGH
Advisory Identifier: GHSA-wwpq-f5c3-7hvx
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CVSS 7.0
CWE-377
Published
Advisory Summary

CVE-2026-40973 is a HIGH (CVSS 7.0) spring boot accepts predictable temp vulnerability (CWE-377: Insecure Temporary File) affecting Spring Framework libraries in the Maven ecosystem. The issue involves spring boot accepts predictable temp directory without ownership verification. Remediation is available by upgrading affected packages to version 4.0.6, 3.5.14.

CVE-2026-40973 at a Glance

CVE Identifier CVE-2026-40973
GHSA Identifier GHSA-wwpq-f5c3-7hvx
Severity HIGH
CVSS v3.1 Base Score 7.0
CWE Classification CWE-377: Insecure Temporary File
Affected Product Spring Framework
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Local (AV:L)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-40973

To remediate this vulnerability, upgrade all affected Spring Framework dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.springframework.boot:spring-boot fixed: 4.0.6 
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot</artifactId>
    <version>4.0.6</version>
</dependency>
org.springframework.boot:spring-boot fixed: 3.5.14 
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot</artifactId>
    <version>3.5.14</version>
</dependency>
org.springframework.boot:spring-boot fixed: Latest secure release 
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot</artifactId>
    <version>Latest secure release</version>
</dependency>
org.springframework.boot:spring-boot fixed: Latest secure release 
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot</artifactId>
    <version>Latest secure release</version>
</dependency>
org.springframework.boot:spring-boot fixed: Latest secure release 
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot</artifactId>
    <version>Latest secure release</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.springframework.boot

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-40973, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.springframework.boot

Analyze the terminal output to locate any version of Spring Framework in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.0.6), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.springframework.boot command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-377: Insecure Temporary File, where creating and using insecure temporary files can leave application and system data vulnerable to attack. In Spring Framework, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A local attacker on the same host as the application may be able to take control of the directory used by `ApplicationTemp`. When `server.servlet.session.persistent` is set to `true` and the attack persists across application restarts, this may allow the attacker to read session information and hijack authenticated users or deploy a gadget chain and execute code as the application's user. Affected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); predictable temp directory / `ApplicationTemp` ownership verification. Versions that are no longer supported are also affected per vendor advisory.

CVE-2026-40973 Affected Spring Framework Versions

5 component(s)
Fixed Versions:
4.0.63.5.14
Product / Package Ecosystem Affected Versions Fixed Version
org.springframework.boot:spring-boot
maven/org.springframework.boot/spring-boot
Maven
≥ 4.0.0
< 4.0.6
4.0.6
org.springframework.boot:spring-boot
maven/org.springframework.boot/spring-boot
Maven
≥ 3.5.0
< 3.5.14
3.5.14
org.springframework.boot:spring-boot
maven/org.springframework.boot/spring-boot
Maven
≥ 3.4.0
≤ 3.4.15
org.springframework.boot:spring-boot
maven/org.springframework.boot/spring-boot
Maven
≥ 3.3.0
≤ 3.3.18
org.springframework.boot:spring-boot
maven/org.springframework.boot/spring-boot
Maven
≤ 2.7.32

References

NVD — CVE-2026-40973 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40973
Spring Framework Source Repository REPOSITORY
https://github.com/spring-projects/spring-boot
Spring Framework Security Information SECURITY
https://spring.io/security/cve-2026-40973

Frequently Asked Questions

What is CVE-2026-40973?
CVE-2026-40973 is a security vulnerability in Spring Framework involving Spring Boot accepts predictable temp directory without ownership verification under CWE-377: Insecure Temporary File.
Which Spring Framework versions are affected?
Affected versions include releases prior to 4.0.6, 3.5.14 across affected packages: org.springframework.boot:spring-boot.
What version fixes CVE-2026-40973?
Upgrading to 4.0.6, 3.5.14 (or the latest patched release for your respective branch) resolves the vulnerability.
Is spring-boot affected?
Yes, org.springframework.boot:spring-boot is affected in releases prior to 4.0.6, 3.5.14, Latest secure release. Upgrade your dependency to 4.0.6, 3.5.14, Latest secure release or later.
What is the CVSS score of CVE-2026-40973?
CVE-2026-40973 has a CVSS v3.1 base score of 7.0 (HIGH) with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-40973?
CVE-2026-40973 is classified under CWE-377: Insecure Temporary File (Creating and using insecure temporary files can leave application and system data vulnerable to attack.).
How can I check Maven dependencies for CVE-2026-40973?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.springframework.boot'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-wwpq-f5c3-7hvx",
  "modified" : "2026-05-06T19:00:10Z",
  "published" : "2026-04-28T00:31:41Z",
  "aliases" : [ "CVE-2026-40973" ],
  "summary" : "Spring Boot accepts predictable temp directory without ownership verification",
  "details" : "A local attacker on the same host as the application may be able to take control of the directory used by `ApplicationTemp`. When `server.servlet.session.persistent` is set to `true` and the attack persists across application restarts, this may allow the attacker to read session information and hijack authenticated users or deploy a gadget chain and execute code as the application's user.\n\nAffected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); predictable temp directory / `ApplicationTemp` ownership verification. Versions that are no longer supported are also affected per vendor advisory.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.springframework.boot:spring-boot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "4.0.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.springframework.boot:spring-boot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.5.0"
      }, {
        "fixed" : "3.5.14"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.springframework.boot:spring-boot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.4.0"
      }, {
        "last_affected" : "3.4.15"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.springframework.boot:spring-boot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.3.0"
      }, {
        "last_affected" : "3.3.18"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.springframework.boot:spring-boot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.7.32"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-40973"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/spring-projects/spring-boot"
  }, {
    "type" : "WEB",
    "url" : "https://spring.io/security/cve-2026-40973"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-377" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-06T19:00:10Z",
    "nvd_published_at" : "2026-04-28T00:16:24Z"
  }
}