CVE-2026-57198

Asterisk is an open source private branch exchange and telephony toolkit. In affected deployments, an authenticated attacker may cause a `T.140 RED` heap buffer overflow using carefully crafted packets, potentially allowing remote code execution or causing Asterisk to crash. The `chan_sip` channel driver must be installed and configured, and its `textsupport` option must be enabled; `textsupport` defaults to no. `The chan_sip driver was deprecated in Asterisk 20 and completely removed in all later versions.` Repository comparisons verify patch containment in Asterisk 20.20.1, 21.12.3, 22.10.1 and 23.4.1, and Certified Asterisk 20.7-cert11 and 22.8-cert3. The affected release-track scope remains unresolved: structured metadata includes later release tracks even though the advisory says the required `chan_sip` driver was removed there.

• CWE-122

• https://github.com/asterisk/asterisk/commit/0601c33d4edf8c8f221de91cead59460fb1e7180
• https://github.com/asterisk/asterisk/commit/111487298a954a029daae941eac423f0609b1261
• https://github.com/asterisk/asterisk/commit/536218a86b797996e8e8844deacc8207de373701
• https://github.com/asterisk/asterisk/commit/a89b61d7c756f816c7fa5327ead9e889f1531202
• https://github.com/asterisk/asterisk/commit/eaa108c68a32c080d7a168ef1d8bf784d5d830f4
• https://github.com/asterisk/asterisk/commit/eef894282be203cb9e6d8e9692e9c360a0b569b4
• https://github.com/asterisk/asterisk/commit/fde69a1f3ff17f507a1578ae27b528f43ceb5efd
• https://github.com/asterisk/asterisk/releases/tag/20.20.1
• https://github.com/asterisk/asterisk/releases/tag/21.12.3
• https://github.com/asterisk/asterisk/releases/tag/22.10.1
• https://github.com/asterisk/asterisk/releases/tag/23.4.1
• https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11
• https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3
• https://github.com/asterisk/asterisk/security/advisories/GHSA-vfhr-r9x9-c687
• https://github.com/asterisk/asterisk/tree/24.0.0-pre1

Published

Oct 27, 2026

Last Modified

Nov 2, 2026

Status

Undergoing Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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