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No exploitation reportedFix available

CVE-2026-123805

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

No exploitation reported by the sources we read.

  • Published2026-11-09
  • Fixed in10.0.14
  • WeaknessCWE-125 · CWE-755

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-11-0919:57CVE publishedCNA

Versions per branch

OSV
SIPSorcery
BranchAffectedFixed in
10.0< 10.0.1410.0.14

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • sipsorcery-org sipsorcery
    Affected
    • = < 10.0.14no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-09

Fix

  1. Update SIPSorcery to 10.0.14

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.17.52026-11-09
  • CNAweakness (CWE)CWE-125, CWE-7552026-11-09
  • NVDweakness (CWE)CWE-125, CWE-755read 2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-08-12

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-11-09
Last Modified
2026-11-09
NVD status
Deferred
GitHub Advisory
GHSA-jwjp-4649-v8jp

Frequently asked questions

What is CVE-2026-123805?

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.

Is CVE-2026-123805 actively exploited?

Active exploitation of CVE-2026-123805 has not been confirmed.

What is the CVSS score for CVE-2026-123805?

CVE-2026-123805 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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