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CVE-2026-54632 high CVSS 7.5

Vulnerability in SIPSorcery (CVE-2026-54632)

Summary

Vulnerability in SIPSorcery (CVE-2026-54632). Risk of unauthorized operations or information disclosure. Exploitable via Close. Mitigation: upgrade to 10.0.9 or later.

Original description

The description as published by the source.

Impact

A single malformed inbound UDP packet on the RTP/ICE socket can remotely terminate an active RTP or WebRTC media session. The packet receive handler indexes packet (and STUN attribute) bytes without sufficient length checks and throws, and the UDP receive loop converted any such exception into a channel Close rather than dropping the packet. One small, unauthenticated packet therefore ends the media session.

This is reachable during ICE connectivity checks — before the DTLS handshake and before any STUN MESSAGE-INTEGRITY verification. Because the RTP/ICE port is shared/advertised in the ICE candidates, a peer or on-path attacker can reach it (exposure is lower for a blind off-path attacker that must first learn the ephemeral port). Impact is availability only — no loss of confidentiality or integrity.

Affected versions

NuGet package SIPSorcery <= 10.0.8.

Patches

Fixed in 10.0.9.

Root cause

Two issues combine:

  1. Unchecked indexing of untrusted bytes.
    • RTPChannel.OnRTPPacketReceived read packet[1] after only checking the packet was non-empty, so a 1-byte packet threw IndexOutOfRangeException.
    • STUNAttribute.ParseMessageAttributes passed a null/short value to the typed attribute parsers, and STUNXORAddressAttribute (and the non-XOR STUNAddressAttribute) then read attributeValue[1], AsSpan(2) and AsSpan(4) with no length check. A STUN message carrying an XOR-MAPPED-ADDRESS, XOR-PEER-ADDRESS or `XOR-REL…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-54632 has been found in SIPSorcery.
Attackers can target a specific entry point like Close over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade SIPSorcery to 10.0.9 or later.
If unsure, ask your IT team or search "SIPSorcery CVE-2026-54632" on the vendor's site.

CVE-2026-54632 (SIPSorcery) — CWE-20 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: Close / SIPSorcery / RTPChannel.OnRTPPacketReceived / IndexOutOfRangeException
Patched: 10.0.9 — apply immediately
Workaround: None within the library short of upgrading.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-20) exists in SIPSorcery. Attackers reach the vulnerable code path via Close without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of SIPSorcery. Attack surface: Close / SIPSorcery / RTPChannel.OnRTPPacketReceived / IndexOutOfRangeException.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 10.0.9.

🛡️ Workaround

Workaround: None within the library short of upgrading.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'SIPSorcery' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'SIPSorcery' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で SIPSorcery を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply temporary workaround mitigate 
    None within the library short of upgrading.

    パッチが適用されるまでの応急処置として、None within the library short of upgrading. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 3
    Apply patch patch 
    Upgrade SIPSorcery to 10.0.9

    ステージング環境で 10.0.9 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  4. 4
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

nuget SIPSorcery
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.0.9"}]}]

References

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