Answer in brief
CVE-2026-54909 records a Medium severity (CVSS 5.3) vulnerability in Pion STUN vulnerable to remote denial of service via panic while parsing a malformed XOR-MAPPED-ADDRESS attribute. The current sources do not mark it as known exploited. The current feed maps github.com/pion/stun (go), github.com/pion/stun/v2 (go), github.com/pion/stun/v3 (go), github.com/pion/stun/v3 (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps github.com/pion/stun (go), github.com/pion/stun/v2 (go), github.com/pion/stun/v3 (go), github.com/pion/stun/v3 (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| github.com/pion/stungo | <=1.23.1 | Not reported |
| github.com/pion/stun/v2go | <=2.0.0 | Not reported |
| github.com/pion/stun/v3go | <=3.1.4 | 3.1.5 |
| github.com/pion/stun/v3go | >=0 <3.1.5 | 3.1.5 |
Published upstream
Jul 31, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Aug 2, 2026
In github.com/pion/stun/v3 before 3.1.5, XORMappedAddress.GetFromAs reads the address family header from an XOR-MAPPED-ADDRESS attribute before validating the attribute length. Parsing a malformed STUN message carrying a zero-length XOR-MAPPED-ADDRESS attribute from a tightly sized buffer causes a slice bounds out of range panic, resulting in a denial of service.
Quoted source text, attributed separately from HOL analysis.