CVE-2026-77322 SIPGO: DoS via unvalidated WebSocket frame length
An unauthenticated attacker can crash the server or exhaust memory by sending a WebSocket frame with an excessively large declared length.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-77322?
CVE-2026-77322 is a high-severity denial of service vulnerability in emiago sipgo, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SIPGO is a library for writing SIP services in the GO language. Prior to 1.4.3, WSConnection.Read in sip/transport_ws.go creates a wsutil.Reader without setting MaxFrameSize, allowing NextFrame to accept a client-controlled header.Length before ParseMaxMessageLength is applied. An unauthenticated WS or WSS peer can send a frame header declaring an extremely large payload, causing an oversized allocation or a makeslice length panic before the payload is read and crashing or exhausting memory in the server process. This issue is fixed in version 1.4.3.
Weakness: CWE-789
Which versions are affected by CVE-2026-77322?
3 open source packages ship an affected version, including github.com/emiago/sipgo.
| Package | Affected | Fixed in |
|---|---|---|
github.com/emiago/sipgo Go | All versions | 1.4.3 |
github.com/emiago/sipgo Go | All versions | 1.4.3 |
github.com/emiago/sipgo Go | All versions | 1.4.3 |
How do I fix CVE-2026-77322?
Upgrade github.com/emiago/sipgo to 1.4.3 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-77322 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77322 exists.
Sources
Also known as GHSA-8h6x-h86x-75wh, GO-2026-6559, MINI-2vfc-h8cx-37mf, MINI-3f4c-j9q7-w237, MINI-8chp-jjg3-w427, MINI-g6vc-pp62-qgpw and 2 more.