CVE-2020-8908: Guava Information Disclosure Vulnerability

Q: What is CVE-2020-8908?

CVE-2020-8908 is a security vulnerability in Guava involving Information Disclosure in Guava under CWE-173: Improper Handling of Alternate Encoding.

Q: Which Guava versions are affected?

Affected versions include releases prior to 32.0.0-android across affected packages: com.google.guava:guava.

Q: What version fixes CVE-2020-8908?

Upgrading to 32.0.0-android (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is guava affected?

Yes, com.google.guava:guava is affected in releases prior to 32.0.0-android. Upgrade your dependency to 32.0.0-android or later.

Q: What is the CVSS score of CVE-2020-8908?

CVE-2020-8908 has a CVSS v3.1 base score of 3.3 (LOW) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Q: What CWE is associated with CVE-2020-8908?

CVE-2020-8908 is classified under CWE-173: Improper Handling of Alternate Encoding (The product does not properly handle when an input uses an alternate encoding that is valid for the control sphere to which the input is being sent.).

Q: How can I check Maven dependencies for CVE-2020-8908?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=com.google.guava'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

LOW

Advisory Identifier: GHSA-5mg8-w23w-74h3

CVSS 3.3

CWE-173 CWE-732 CWE-200 CWE-378

Published 2021-03-25

Advisory Summary

CVE-2020-8908 is a LOW (CVSS 3.3) information disclosure vulnerability (CWE-173: Improper Handling of Alternate Encoding) affecting Guava libraries in the Maven ecosystem. The issue involves information disclosure in guava. Remediation is available by upgrading affected packages to version 32.0.0-android.

CVE-2020-8908 at a Glance

CVE Identifier CVE-2020-8908

GHSA Identifier GHSA-5mg8-w23w-74h3

Severity LOW

CVSS v3.1 Base Score 3.3

CWE Classification CWE-173: Improper Handling of Alternate Encoding

Affected Product Guava

Package Ecosystem Maven

Published Date 2021-03-25

Last Updated 2026-02-23

Security Impact

CVSS: 3.3

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

Attack Vector Local (AV:L)

Attack Complexity Low (AC:L)

Privileges Required Low (PR:L)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality Low (C:L)

Integrity None (I:N)

Availability None (A:N)

How to Fix CVE-2020-8908

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

com.google.guava:guava fixed: 32.0.0-android

<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>32.0.0-android</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=com.google.guava

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-8908, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=com.google.guava

Analyze the terminal output to locate any version of Guava in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 32.0.0-android), your application is affected.

Note: The mvn dependency:tree -Dincludes=com.google.guava 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-173: Improper Handling of Alternate Encoding, where the product does not properly handle when an input uses an alternate encoding that is valid for the control sphere to which the input is being sent. In Guava, 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 temp directory creation vulnerability exists in Guava prior to version 32.0.0 allowing an attacker with access to the machine to potentially access data in a temporary directory created by the Guava `com.google.common.io.Files.createTempDir()`. The permissions granted to the directory created default to the standard unix-like /tmp ones, leaving the files open. Maintainers recommend explicitly changing the permissions after the creation of the directory, or removing uses of the vulnerable method.

CVE-2020-8908 Affected Guava Versions

1 component(s)

Fixed Versions:

32.0.0-android

Product / Package	Ecosystem	Affected Versions	Fixed Version
com.google.guava:guava maven/com.google.guava/guava	Maven	< 32.0.0-android	32.0.0-android

References

NVD — CVE-2020-8908 NVD

https://nvd.nist.gov/vuln/detail/CVE-2020-8908

Guava Source Repository REPOSITORY

https://github.com/google/guava/issues/4011

Guava Source Repository REPOSITORY

https://github.com/google/guava/issues/4011#issuecomment-1578991974

Security Fix Commit FIX COMMIT

https://github.com/google/guava/commit/feb83a1c8fd2e7670b244d5afd23cba5aca43284

Security Fix Commit FIX COMMIT

https://github.com/google/guava/commit/fec0dbc4634006a6162cfd4d0d09c962073ddf40

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Guava Security Information SECURITY

https://www.oracle.com/security-alerts/cpuoct2021.html

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Guava Security Information SECURITY

https://www.oracle.com/security-alerts/cpujan2022.html

Guava Security Information SECURITY

https://www.oracle.com/security-alerts/cpuapr2022.html

Guava Security Information SECURITY

https://www.oracle.com/security-alerts/cpuApr2021.html

Guava Security Information SECURITY

https://www.oracle.com//security-alerts/cpujul2021.html

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https://snyk.io/vuln/SNYK-JAVA-COMGOOGLEGUAVA-1015415

Guava Security Information SECURITY

https://security.netapp.com/advisory/ntap-20220210-0003

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Guava Source Repository REPOSITORY

https://github.com/google/guava

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Frequently Asked Questions

What is CVE-2020-8908?

CVE-2020-8908 is a security vulnerability in Guava involving Information Disclosure in Guava under CWE-173: Improper Handling of Alternate Encoding.

Which Guava versions are affected?

Affected versions include releases prior to 32.0.0-android across affected packages: com.google.guava:guava.

What version fixes CVE-2020-8908?

Upgrading to 32.0.0-android (or the latest patched release for your respective branch) resolves the vulnerability.

Is guava affected?

Yes, com.google.guava:guava is affected in releases prior to 32.0.0-android. Upgrade your dependency to 32.0.0-android or later.

What is the CVSS score of CVE-2020-8908?

CVE-2020-8908 has a CVSS v3.1 base score of 3.3 (LOW) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

What CWE is associated with CVE-2020-8908?

CVE-2020-8908 is classified under CWE-173: Improper Handling of Alternate Encoding (The product does not properly handle when an input uses an alternate encoding that is valid for the control sphere to which the input is being sent.).

How can I check Maven dependencies for CVE-2020-8908?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=com.google.guava'. 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-5mg8-w23w-74h3",
  "modified" : "2026-02-23T22:45:53Z",
  "published" : "2021-03-25T17:04:19Z",
  "aliases" : [ "CVE-2020-8908" ],
  "summary" : "Information Disclosure in Guava",
  "details" : "A temp directory creation vulnerability exists in Guava prior to version 32.0.0 allowing an attacker with access to the machine to potentially access data in a temporary directory created by the Guava `com.google.common.io.Files.createTempDir()`. The permissions granted to the directory created default to the standard unix-like /tmp ones, leaving the files open. Maintainers recommend explicitly changing the permissions after the creation of the directory, or removing uses of the vulnerable method.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "com.google.guava:guava"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "32.0.0-android"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-8908"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/google/guava/issues/4011"
  }, {
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    "url" : "https://github.com/google/guava/issues/4011#issuecomment-1578991974"
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    "url" : "https://github.com/google/guava/commit/feb83a1c8fd2e7670b244d5afd23cba5aca43284"
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  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-173", "CWE-200", "CWE-378", "CWE-732" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-25T17:01:09Z",
    "nvd_published_at" : "2020-12-10T23:15:00Z"
  }
}

CVSS V3

3.3 LOW

Attack Vector Local (AV:L)

Attack Complexity Low (AC:L)

Privileges Required Low (PR:L)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality Low (C:L)

Integrity None (I:N)

Availability None (A:N)

Vector String

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Advisory Metadata

Source ID: GHSA-5mg8-w23w-74h3
Schema Version: 1.4.0
Published: 2021-03-25 17:04
Last Modified: 2026-02-23 22:45
Database Record File: advisories/github-reviewed/2021/03/GHSA-5mg8-w23w-74h3/GHSA-5mg8-w23w-74h3.json