GO-2026-6550Published

SIPGO: DoS via unvalidated Content-Length in the stream parser

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-58268

Published

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.

Source published: 22 Sep 2026 19:49:09 UTC
Source modified: 23 Sep 2026 12:38:58 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

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CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

euvd · EUVD-2026-84817

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 22, 2026, 7:49:09 PM

dateUpdated: Sep 23, 2026, 12:38:58 PM

1 related source bulletins · separate from aliases

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

CVE-2026-58268

Source published: Sep 22, 2026, 7:49:09 PM (timezone not stated)
Source modified: Sep 23, 2026, 12:38:58 PM (timezone not stated)
Observed here: 11 Nov 2026 14:59:42 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd · CVE-2026-58268

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-789

Original publisher date fields

published: 2026-09-22T20:17:03.960

lastModified: 2026-09-23T18:12:04.247

Source published: 22 Sep 2026 20:17:03 UTC
Source modified: 23 Sep 2026 18:12:04 UTC
Observed here: 25 Oct 2026 14:19:16 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

osv · GHSA-pg59-5vwg-4jxq

Published

### 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:[email protected] SIP/2.0 Via: SIP/2.0/TCP attacker.example;branch=z9hG4bK1 From: <sip:[email protected]>;tag=1 To: <sip:[email protected]> Call-ID: [email protected] 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.

Source published: 22 Sep 2026 19:57:51 UTC
Source modified: 1 Oct 2026 20:55:47 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Publisher rating · HIGH

osv · GO-2026-6550

Published

SIPGO: DoS via unvalidated Content-Length in the stream parser in github.com/emiago/sipgo

Source published: 1 Oct 2026 20:23:38 UTC
Source modified: 1 Oct 2026 20:45:12 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.