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CVE-2026-123805

SIPSorcery: Unbounded SCTP SACK gap/duplicate counts cause out-of-bounds read that kills the data-channel receive thread (DoS)

publishedCWE-125CWE-755

SIPSorcery is a WebRTC, SIP, and VoIP library for C# and .NET. Prior to 10.0.14, SctpSackChunk.ParseChunk reads the numGapAckBlocks and numDuplicateTSNs fields from an attacker-controlled SCTP SACK chunk without checking that the corresponding entries fit the declared chunk length. A negotiated WebRTC peer can send a checksum-valid malformed SACK chunk that drives the parser beyond the 262144-byte receive buffer. The resulting IndexOutOfRangeException bypasses the recoverable ApplicationException handler in RTCSctpTransport.DoReceive, causing the generic handler to exit the dedicated receive loop and permanently terminate the SCTP association and all data channels. This issue is fixed in 10.0.14.

Technical severity7.5 highCVSS 3.1 · CNA: GitHub_M
Published2026-11-09Source updated 2026-11-12
Collected2026-11-125 attributed sources

Fixes and workarounds

Fix

SIPSorcery (nuget): GitHub reports patched versions 10.0.14. Check the advisory for the affected release branch.

Source: GitHub GHSA-jwjp-4649-v8jp

Fix

SIPSorcery (NuGet): OSV reports a fixed version 10.0.14. Check the advisory for supported release branches.

Source: OSV GHSA-jwjp-4649-v8jp

Affected products and versions

ProductVersionsAuthority
sipsorcery
sipsorcery-org 		< 10.0.14 (affected) CNA: GitHub_M
SIPSorcery

SIPSorcery
nuget 		<= 10.0.13 (affected, GitHub advisory range) GitHub GHSA-jwjp-4649-v8jp
SIPSorcery

SIPSorcery
NuGet 		1.3.0-PRE (affected, NuGet)
1.3.1 (affected, NuGet)
1.4.0 (affected, NuGet)
1.4.1 (affected, NuGet)
1.5.0 (affected, NuGet)
1.5.2 (affected, NuGet)
1.5.3 (affected, NuGet)
1.5.5 (affected, NuGet)
1.5.6 (affected, NuGet)
1.6.0 (affected, NuGet)
1.6.1 (affected, NuGet)
1.6.2 (affected, NuGet)
10.0.1 (affected, NuGet)
10.0.10 (affected, NuGet)
10.0.11 (affected, NuGet)
10.0.12 (affected, NuGet)
10.0.13 (affected, NuGet)
10.0.2 (affected, NuGet)
10.0.3 (affected, NuGet)
10.0.4-pre (affected, NuGet)
10.0.5 (affected, NuGet)
10.0.6 (affected, NuGet)
10.0.7 (affected, NuGet)
10.0.8 (affected, NuGet)
10.0.9 (affected, NuGet)
2.0.0 (affected, NuGet)
2.0.1 (affected, NuGet)
3.0.0 (affected, NuGet)
3.0.1 (affected, NuGet)
3.0.2 (affected, NuGet)
3.0.3 (affected, NuGet)
3.0.4 (affected, NuGet)
3.1.0 (affected, NuGet)
3.2.0 (affected, NuGet)
3.3.0 (affected, NuGet)
3.4.0 (affected, NuGet)
3.5.0 (affected, NuGet)
3.6.0 (affected, NuGet)
4.0.0-rc (affected, NuGet)
4.0.1-rc (affected, NuGet)
4.0.13-pre (affected, NuGet)
4.0.2-rc (affected, NuGet)
4.0.28-pre (affected, NuGet)
4.0.29-pre (affected, NuGet)
4.0.3-rc (affected, NuGet)
4.0.30-pre (affected, NuGet)
4.0.31-pre (affected, NuGet)
4.0.32-pre (affected, NuGet)
4.0.33-pre (affected, NuGet)
4.0.34-pre (affected, NuGet)
4.0.35-pre (affected, NuGet)
4.0.4-rc (affected, NuGet)
4.0.40-pre (affected, NuGet)
4.0.41-pre (affected, NuGet)
4.0.42-pre (affected, NuGet)
4.0.43-pre (affected, NuGet)
4.0.44-pre (affected, NuGet)
4.0.45-pre (affected, NuGet)
4.0.46-pre (affected, NuGet)
4.0.47-pre (affected, NuGet)
4.0.49-pre (affected, NuGet)
4.0.50-pre (affected, NuGet)
4.0.51-pre (affected, NuGet)
4.0.55-pre (affected, NuGet)
4.0.58-pre (affected, NuGet)
4.0.59-pre (affected, NuGet)
4.0.60-pre (affected, NuGet)
4.0.7-rc (affected, NuGet)
4.0.8-rc (affected, NuGet)
5.1.0 (affected, NuGet)
5.1.1 (affected, NuGet)
5.1.2 (affected, NuGet)
5.1.4-pre (affected, NuGet)
5.1.5-pre (affected, NuGet)
5.1.6-pre (affected, NuGet)
5.1.7-pre (affected, NuGet)
5.1.8-pre (affected, NuGet)
5.2.0 (affected, NuGet)
5.2.3 (affected, NuGet)
5.3.0-pre (affected, NuGet)
5.3.3-pre (affected, NuGet)
6.0.1-pre (affected, NuGet)
6.0.11 (affected, NuGet)
6.0.12 (affected, NuGet)
6.0.2 (affected, NuGet)
6.0.3 (affected, NuGet)
6.0.4 (affected, NuGet)
6.0.6 (affected, NuGet)
6.0.7 (affected, NuGet)
6.0.8 (affected, NuGet)
6.0.9 (affected, NuGet)
6.1.0-pre (affected, NuGet)
6.1.1-pre (affected, NuGet)
6.2.0 (affected, NuGet)
6.2.1 (affected, NuGet)
6.2.3 (affected, NuGet)
6.2.4 (affected, NuGet)
8.0.0 (affected, NuGet)
8.0.1 (affected, NuGet)
8.0.10 (affected, NuGet)
8.0.11 (affected, NuGet)
8.0.12 (affected, NuGet)
8.0.13 (affected, NuGet)
8.0.14 (affected, NuGet)
8.0.15-pre (affected, NuGet)
8.0.20-pre (affected, NuGet)
8.0.21-pre (affected, NuGet)
8.0.22 (affected, NuGet)
8.0.23 (affected, NuGet)
8.0.3 (affected, NuGet)
8.0.4 (affected, NuGet)
8.0.5 (affected, NuGet)
8.0.6 (affected, NuGet)
8.0.7 (affected, NuGet)
8.0.9 (affected, NuGet)
Ecosystem version events: introduced 0; fixed 10.0.14
Source events (ECOSYSTEM) 
[
  {
    "introduced": "0"
  },
  {
    "fixed": "10.0.14"
  }
]

Other versions: unaffected 		OSV GHSA-jwjp-4649-v8jp

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

Version / scoreVectorAuthority
3.1 / 7.5
high		 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCNA: GitHub_M
3.1 / 7.5
high		 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HNVD: [email protected]

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

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