🛡️ CVE-2026-54909 — stun

🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-20 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

Weakness class

CVE-2026-54909 is classified as CWE-20: Improper Input Validation. The application accepts input without checking that it has the expected form, so malformed values reach code that assumes they are well formed.

Affected software

CVE-2026-54909 is recorded against 4 packages.

  • github.com/pion/stun
  • github.com/pion/stun/v2
  • github.com/pion/stun/v3
  • unknown

Timeline and source

Published on 31 July 2026 and last revised on 1 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity Medium
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE CWE-20
Public Exploit ✅ No
Source NVD
Published 2026-07-31
Updated 2026-08-12
Modified 2026-08-01
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/pion/stun — —
github.com/pion/stun/v2 — —
github.com/pion/stun/v3 — —
unknown — —

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