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Medium, CVSS 5.3amended

Pion STUN vulnerable to remote denial of service via panic while parsing a malformed XOR-MAPPED-ADDRESS attribute

CVE-2026-54909GHSA-34rh-wp3j-6cxc

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Go github.com/pion/stun

    Affected
    <= 1.23.1
    Fixed in
    no fixed version recorded

  • Go github.com/pion/stun/v3

    Affected
    <= 3.1.4
    Fixed in
    3.1.5

  • Go github.com/pion/stun/v2

    Affected
    <= 2.0.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS
  • CVE-2026-54909: 0.64% estimated exploitation activity in the next 30 days; percentile 50.95 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-34rh-wp3j-6cxc

  2. Revision 2 · amended ·

    Amended from osv record GO-2026-6163

  3. Revision 1 · created ·

    Published from osv record GHSA-34rh-wp3j-6cxc

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-54909

Advisory: Pion STUN vulnerable to remote denial of service via panic while parsing a malformed XOR-MAPPED-ADDRESS attribute
IDs: CVE-2026-54909, GHSA-34rh-wp3j-6cxc
Record: https://patchnext.com/advisories/cve-2026-54909 (revision 3, source checked 26 Oct 2026, 15:28 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: github.com/pion/stun/v3 3.1.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/pion/stun: affected <= 1.23.1
- Go github.com/pion/stun/v3: affected <= 3.1.4; fixed in 3.1.5
- Go github.com/pion/stun/v2: affected <= 2.0.0

## Suggested inspection (read-only)
- Go github.com/pion/stun: check the installed version with your package manager.
- Go github.com/pion/stun/v3: check the installed version with your package manager.
- Go github.com/pion/stun/v2: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/pion/stun, github.com/pion/stun/v3, github.com/pion/stun/v2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-34rh-wp3j-6cxc (OSV record GHSA-34rh-wp3j-6cxc lists affected ranges: Go github.com/pion/stun/v3 >=0 =0 =0 <=1.23.1)
- Verified: https://osv.dev/vulnerability/GO-2026-6163 (OSV record GO-2026-6163 lists affected ranges: Go github.com/pion/stun/v3 >=0 <3.1.5 (fixed))
- Verified: https://github.com/advisories/GHSA-34rh-wp3j-6cxc (GitHub-reviewed advisory GHSA-34rh-wp3j-6cxc lists affected ranges: Go github.com/pion/stun/v3 >=0 =0 =0 <=1.23.1)

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