CVE WatchNov 9, 2026

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 numD

CVSS

7.5

High

EPSS

0.4%

p32

KEV

—

Exploit Today

0-100

Published: Nov 9, 2026 · Last modified: Nov 9, 2026 · CWE-125 · CWE-755

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-11-102026-11-11

Technical 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.

Official references

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