SIPGO: DoS via unvalidated Content-Length in the stream parser
### Summary 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): ```go 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: ;tag=1 To: 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.
GHSA-pg59-5vwg-4jxq
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:GHSA-pg59-5vwg-4jxq
github.com/emiago/sipgo
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.4.1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.4.1"
}
]
}
],
"package": {
"name": "github.com/emiago/sipgo",
"purl": "pkg:golang/github.com/emiago/sipgo",
"ecosystem": "Go"
},
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-pg59-5vwg-4jxq/GHSA-pg59-5vwg-4jxq.json",
"last_known_affected_version_range": "<= 1.4.0"
}
}
]- Related CVEs
- CVE-2026-58268
Source reference:
/aliases
Publisher severity
high
Source reference: /database_specific/severity
- Event
- #63895 · Revision 1
- Added to Heist Feed
- Publisher date