CVE-2026-49475: CWE-20: Improper Input Validation in signalwire freeswitch
FreeSWITCH versions prior to 1. 11. 0 contain a vulnerability where a malformed STUN packet with an incorrectly declared attribute length can cause the parser to read and write beyond the intended memory boundaries. This results in an out-of-bounds memory access on the per-leg media buffer. The issue has been addressed in version 1. 11. 0.
AI Analysis
Technical Summary
CVE-2026-49475 is an improper input validation vulnerability in FreeSWITCH before version 1.11.0. Specifically, when processing STUN packets, if the declared attribute length is shorter than the structure size expected by the parser, the parser performs out-of-bounds memory reads and writes on the per-leg media buffer. This vulnerability is classified under CWE-20 (Improper Input Validation), CWE-125 (Out-of-bounds Read), and CWE-787 (Out-of-bounds Write). The vulnerability has been patched in FreeSWITCH version 1.11.0.
Potential Impact
The vulnerability allows an attacker to cause out-of-bounds memory access, which can lead to denial of service by corrupting memory or crashing the affected process. According to the CVSS v3.1 score of 7.5 (high severity), the impact affects availability (A:H) but not confidentiality or integrity. There is no indication of known exploits in the wild.
Mitigation Recommendations
Upgrade FreeSWITCH to version 1.11.0 or later, where this vulnerability has been patched. No other mitigation or temporary workaround is indicated by the vendor advisory information.
CVE-2026-49475: CWE-20: Improper Input Validation in signalwire freeswitch
Description
FreeSWITCH versions prior to 1. 11. 0 contain a vulnerability where a malformed STUN packet with an incorrectly declared attribute length can cause the parser to read and write beyond the intended memory boundaries. This results in an out-of-bounds memory access on the per-leg media buffer. The issue has been addressed in version 1. 11. 0.
CVSS v3.1
Score 7.5high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-49475 is an improper input validation vulnerability in FreeSWITCH before version 1.11.0. Specifically, when processing STUN packets, if the declared attribute length is shorter than the structure size expected by the parser, the parser performs out-of-bounds memory reads and writes on the per-leg media buffer. This vulnerability is classified under CWE-20 (Improper Input Validation), CWE-125 (Out-of-bounds Read), and CWE-787 (Out-of-bounds Write). The vulnerability has been patched in FreeSWITCH version 1.11.0.
Potential Impact
The vulnerability allows an attacker to cause out-of-bounds memory access, which can lead to denial of service by corrupting memory or crashing the affected process. According to the CVSS v3.1 score of 7.5 (high severity), the impact affects availability (A:H) but not confidentiality or integrity. There is no indication of known exploits in the wild.
Mitigation Recommendations
Upgrade FreeSWITCH to version 1.11.0 or later, where this vulnerability has been patched. No other mitigation or temporary workaround is indicated by the vendor advisory information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-30T04:17:43.095Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a283e9b8dd33fbd8553f48d
Added to database: 6/9/2026, 4:26:03 PM
Last enriched: 6/9/2026, 4:41:00 PM
Last updated: 6/9/2026, 5:34:50 PM
Views: 2
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