CVE-2026-54909: Github.com/pion/stun/v3 Denial of Service Vulnerability

Q: What is CVE-2026-54909?

CVE-2026-54909 is a security vulnerability in Github.com/pion/stun/v3 involving Pion STUN vulnerable to remote denial of service via panic while parsing a malformed XOR-MAPPED-ADDRESS attribute under CWE-20: Improper Input Validation.

Q: Which Github.com/pion/stun/v3 versions are affected?

Affected versions include releases prior to 3.1.5 across affected packages: github.com/pion/stun/v3, github.com/pion/stun/v2, github.com/pion/stun.

Q: What version fixes CVE-2026-54909?

Upgrading to 3.1.5 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is github.com/pion/stun/v3 affected?

Yes, github.com/pion/stun/v3 is affected in releases prior to 3.1.5. Upgrade your dependency to 3.1.5 or later.

Q: Is github.com/pion/stun/v2 affected?

Yes, github.com/pion/stun/v2 is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.

Q: What is the CVSS score of CVE-2026-54909?

CVE-2026-54909 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Q: What CWE is associated with CVE-2026-54909?

CVE-2026-54909 is classified under 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.).

Q: How can I check Go dependencies for CVE-2026-54909?

Run the dependency tree command: 'inspect dependencies for github.com/pion/stun/v3'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

MODERATE

Advisory Identifier: GHSA-34rh-wp3j-6cxc

CVSS 5.3

CWE-20

Published 2026-07-31

Advisory Summary

CVE-2026-54909 is a MODERATE (CVSS 5.3) denial of service vulnerability (CWE-20: Improper Input Validation) affecting Github.com/pion/stun/v3 libraries in the Go ecosystem. The issue involves pion stun vulnerable to remote denial of service via panic while parsing a malformed xor-mapped-address attribute. Remediation is available by upgrading affected packages to version 3.1.5.

CVE-2026-54909 at a Glance

CVE Identifier CVE-2026-54909

GHSA Identifier GHSA-34rh-wp3j-6cxc

Severity MODERATE

CVSS v3.1 Base Score 5.3

CWE Classification CWE-20: Improper Input Validation

Affected Product Github.com/pion/stun/v3

Package Ecosystem Go

Published Date 2026-07-31

Last Updated 2026-07-31

Security Impact

CVSS: 5.3

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

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity None (I:N)

Availability Low (A:L)

How to Fix CVE-2026-54909

To remediate this vulnerability, upgrade all affected Github.com/pion/stun/v3 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/pion/stun/v3 fixed: 3.1.5

Upgrade github.com/pion/stun/v3 to 3.1.5

github.com/pion/stun/v2 fixed: Latest secure release

Upgrade github.com/pion/stun/v2 to Latest secure release

github.com/pion/stun fixed: Latest secure release

Upgrade github.com/pion/stun to Latest secure release

Verify Direct and Transitive Dependencies

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

inspect dependencies for github.com/pion/stun/v3

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-54909, inspect your project dependencies for Github.com/pion/stun/v3:

inspect dependencies for github.com/pion/stun/v3

Analyze the terminal output to locate any version of Github.com/pion/stun/v3 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.5), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where 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. In Github.com/pion/stun/v3, 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

### Impact Remote denial of service via panic while parsing a malformed XOR-MAPPED-ADDRESS attribute ### Patches Upgrade to v3.1.5 or later. This version includes this patch https://github.com/pion/stun/pull/278 which fixes the issue. ### Workarounds No work around; please upgrade to v3.1.5 or a newer version.

CVE-2026-54909 Affected Github.com/pion/stun/v3 Versions

3 component(s)

Fixed Versions:

3.1.5

Product / Package	Ecosystem	Affected Versions	Fixed Version
github.com/pion/stun/v3 golang/github.com/pion/stun/v3	Go	< 3.1.5	3.1.5
github.com/pion/stun/v2 golang/github.com/pion/stun/v2	Go	≤ 2.0.0
github.com/pion/stun golang/github.com/pion/stun	Go	≤ 1.23.1

References

GitHub Advisory / Wiki ADVISORY

https://github.com/pion/stun/security/advisories/GHSA-34rh-wp3j-6cxc

Github.com/pion/stun/v3 Source Repository REPOSITORY

https://github.com/pion/stun/pull/278

Security Fix Commit FIX COMMIT

https://github.com/pion/stun/commit/fa9f074a33a8059c76c960b1fbee39f308002423

Github.com/pion/stun/v3 Source Repository REPOSITORY

https://github.com/pion/stun

Github.com/pion/stun/v3 Release RELEASE

https://github.com/pion/stun/releases/tag/v3.1.3

Frequently Asked Questions

What is CVE-2026-54909?

CVE-2026-54909 is a security vulnerability in Github.com/pion/stun/v3 involving Pion STUN vulnerable to remote denial of service via panic while parsing a malformed XOR-MAPPED-ADDRESS attribute under CWE-20: Improper Input Validation.

Which Github.com/pion/stun/v3 versions are affected?

Affected versions include releases prior to 3.1.5 across affected packages: github.com/pion/stun/v3, github.com/pion/stun/v2, github.com/pion/stun.

What version fixes CVE-2026-54909?

Upgrading to 3.1.5 (or the latest patched release for your respective branch) resolves the vulnerability.

Is github.com/pion/stun/v3 affected?

Yes, github.com/pion/stun/v3 is affected in releases prior to 3.1.5. Upgrade your dependency to 3.1.5 or later.

Is github.com/pion/stun/v2 affected?

Yes, github.com/pion/stun/v2 is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.

What is the CVSS score of CVE-2026-54909?

CVE-2026-54909 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

What CWE is associated with CVE-2026-54909?

CVE-2026-54909 is classified under 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.).

How can I check Go dependencies for CVE-2026-54909?

Run the dependency tree command: 'inspect dependencies for github.com/pion/stun/v3'. 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-34rh-wp3j-6cxc",
  "modified" : "2026-07-31T22:03:42Z",
  "published" : "2026-07-31T22:03:42Z",
  "aliases" : [ "CVE-2026-54909" ],
  "summary" : "Pion STUN vulnerable to remote denial of service via panic while parsing a malformed XOR-MAPPED-ADDRESS attribute",
  "details" : "### Impact\nRemote denial of service via panic while parsing a malformed XOR-MAPPED-ADDRESS attribute\n\n### Patches\nUpgrade to v3.1.5 or later. This version includes this patch https://github.com/pion/stun/pull/278 which fixes the issue.\n\n### Workarounds\nNo work around; please upgrade to v3.1.5 or a newer version.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/pion/stun/v3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.5"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.1.4"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/pion/stun/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.0.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/pion/stun"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.23.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/pion/stun/security/advisories/GHSA-34rh-wp3j-6cxc"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pion/stun/pull/278"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pion/stun/commit/fa9f074a33a8059c76c960b1fbee39f308002423"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pion/stun"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pion/stun/releases/tag/v3.1.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-31T22:03:42Z",
    "nvd_published_at" : null
  }
}

CVSS V3

5.3 MODERATE