CVE-2026-54909: pion/stun is a Go implementation of STUN

Q: How do I fix CVE-2026-54909?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Q: Is CVE-2026-54909 being exploited?

CVE-2026-54909 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-54909 affect?

CVE-2026-54909 affects affected software. Severity is medium (CVSS 5.3). pion/stun is a Go implementation of STUN. Prior to 3.1.3, XORMappedAddress.GetFromAs can panic while parsing a malformed short XOR-MAPPED-ADDRESS attribute in STUN or ICE Binding-response parsing paths, allowing remote denial of service. Th

Q: How urgent is CVE-2026-54909?

Priority 36/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTE

CVE-2026-54909 is a medium-severity flaw (CVSS 5.3) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

pion/stun is a Go implementation of STUN. Prior to 3.1.3, XORMappedAddress.GetFromAs can panic while parsing a malformed short XOR-MAPPED-ADDRESS attribute in STUN or ICE Binding-response parsing paths, allowing remote denial of service. This issue is fixed in version 3.1.3.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-07-31
Last modified	2026-10-23

Publisher (CNA): GitHub, Inc.

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-07-31 23:17 UTCPublished CVE record published
2026-10-23 23:10 UTCUpdated Record last modified

Exact fixes by distribution

Go · github.com/pion/stun/v3 · FIXED · 3.1.5 · vulnerable: <= 3.1.4 · source

go get github.com/pion/stun/v3@v3.1.5 go list -m github.com/pion/stun/v3

Go · github.com/pion/stun/v2 · NO FIX YET · vulnerable: <= 2.0.0 · source

Go · github.com/pion/stun · NO FIX YET · vulnerable: <= 1.23.1 · source

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source

sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source

sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310

Debian 12 · golang-github-pion-stun · NO FIX YET

Debian 13 · golang-github-pion-stun · NO FIX YET

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-54909?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-54909 being exploited?

CVE-2026-54909 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-54909 affect?

CVE-2026-54909 affects affected software. Severity is medium (CVSS 5.3). pion/stun is a Go implementation of STUN. Prior to 3.1.3, XORMappedAddress.GetFromAs can panic while parsing a malformed short XOR-MAPPED-ADDRESS attribute in STUN or ICE Binding-response parsing paths, allowing remote denial of service. Th

How urgent is CVE-2026-54909?

Priority 36/100. Remotely exploitable, no login, no user action

References

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