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TI-2026-76715 Aliases CVE-2026-113380GHSA-5c63-xm6f-r368

Remote peer can block hangup in Signal RingRTC calls

Priority MEDIUM 44CWE-754Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Signal RingRTC before 2.72.0 contains an improper check for unusual or exceptional conditions (CWE-754). A peer that saturates a call's FSM queue can prevent a local hangup from tearing down the call, including its audio and perhaps video tracks. A remote peer in the call needs no privileges to cause this.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

In the RingRTC library before 2.72.0 for Signal, a peer that saturates a call's FSM queue can interfere with the ability of a local hangup to tear the call (with its audio and perhaps also video track) down.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00898 59th percentileScored 2026-11-07
Fix Fixed RingRTC (Signal): 2.72.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SignalRingRTCbefore 2.72.02.72.0Patch availableCNA
  • RingRTC VendorSignal Affected before 2.72.0 Fixed in 2.72.0 Patch available CNA

Remediation

Update Signal RingRTC to version 2.72.0, the first fixed version, or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA RingRTC (Signal) Fixed in 2.72.0

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-113380
  2. 2026-10-20 Alias added: GHSA-5c63-xm6f-r368
  3. 2026-10-20 CISA SSVC decision points changed
  4. 2026-10-20 Priority changed: MEDIUM → LOW
  5. 2026-10-21 Priority changed: LOW → MEDIUM
  6. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Other 2

  • TI-2023-09843 Signal Desktop before 6.2.0 on Windows, Linux, and macOS allows an attacker to modify… CVSS 3.1HIGH 7.8
  • TI-2023-09844 Signal Desktop before 6.2.0 on Windows, Linux, and macOS allows an attacker to obtain… CVSS 3.1LOW 3.3
  • TI-2019-12817 The WebRTC component in the Signal Private Messenger application through 4.47.7 for… CVSS 3.1CRITICAL 9.8
  • TI-2025-05154 Signal App Biometric Authentication missing critical step in authentication CVSS 4.0LOW 1.0
  • TI-2018-11532 The image rendering component (createGenericPreview) of the Open Whisper Signal app… CVSS 3.0HIGH 8.6
  • TI-2022-11105 The Signal app before 5.34 for iOS allows URI spoofing via RTLO injection. CVSS 3.1HIGH 7.5
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences