CVE-2026-58268 SIPGO: DoS via unvalidated Content-Length in the stream parser
An unauthenticated attacker can cause denial of service in SIPGO by sending oversized Content-Length headers, triggering excessive memory allocation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58268?
CVE-2026-58268 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 1.4.1, ParserStream.parseSingle in sip/parser_stream.go allocates a SIP body buffer from the client-controlled Content-Length header before ParseMaxMessageLength is enforced. An unauthenticated peer can send a stream-transport message over TCP, TLS, WS, or WSS with an oversized declared length, causing excessive memory allocation and denial of service before the body is read. This issue is fixed in version 1.4.1.
Weakness: CWE-789
Which versions are affected by CVE-2026-58268?
3 open source packages ship an affected version, including github.com/emiago/sipgo.
| Package | Affected | Fixed in |
|---|---|---|
github.com/emiago/sipgo Go | All versions | 1.4.1 |
github.com/emiago/sipgo Go | All versions | 1.4.1 |
github.com/emiago/sipgo Go | All versions | 1.4.1 |
How do I fix CVE-2026-58268?
Upgrade github.com/emiago/sipgo to 1.4.1 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-2026-58268 being exploited?
There is no known exploitation of CVE-2026-58268 in the wild and no public exploit code.
Sources
Also known as GHSA-pg59-5vwg-4jxq, GO-2026-6550, MINI-44cw-hmm5-fwg2, MINI-7qrg-82rh-jrfc, MINI-cc5w-jhrr-78w5, MINI-f552-47c7-xwwv and 2 more.