CVE-2026-123805 SIPSorcery vulnerable to Denial of Service via out-of-bounds read in SCTP SACK chunk parsing
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-123805?
CVE-2026-123805 is a high-severity vulnerability in sipsorcery-org sipsorcery, published on 9 Nov 2026.
Official 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.
Which versions are affected by CVE-2026-123805?
1 open source package ship an affected version, including SIPSorcery.
| Package | Affected | Fixed in |
|---|---|---|
SIPSorcery NuGet | All versions | 10.0.14 |
How do I fix CVE-2026-123805?
Upgrade SIPSorcery to 10.0.14 or later.
Is CVE-2026-123805 being exploited?
There is no known exploitation of CVE-2026-123805 in the wild and no public exploit code.
Sources
Also known as GHSA-jwjp-4649-v8jp.