Low 2.3Published Oct 27, 2026

CVE-2026-57198Asterisk: Possible RED T.140 Heap Buffer Overflow

Updated under an hour ago (Oct 29, 2026, 4:23 AM ET)

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Exploited in the last 30 days

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.

CVSS: 2.3 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Weakness (CWE): CWE-122
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 27, 2026

Affected products

Affected products

asterisk asterisk asterisk:asterisk (from the name)	before 20.20.1; from 21.0.0-pre1, < 21.12.3; from 22.0.0-pre1, < 22.10.1; from 23.0.0-pre1, < 23.4.1	CNA record
asterisk certified-asterisk asterisk:certified_asterisk (from the name)	before 20.7-cert11; from 22.8-cert1-pre1, < 22.8-cert3	CNA record

References

References

https://github.com/asterisk/asterisk/security/advisories/GHSA-vfhr-r9x9-c687	x-refsource-confirm
https://github.com/asterisk/asterisk/commit/0601c33d4edf8c8f221de91cead59460fb1e7180	x-refsource-misc
https://github.com/asterisk/asterisk/commit/111487298a954a029daae941eac423f0609b1261	x-refsource-misc
https://github.com/asterisk/asterisk/commit/536218a86b797996e8e8844deacc8207de373701	x-refsource-misc
https://github.com/asterisk/asterisk/commit/a89b61d7c756f816c7fa5327ead9e889f1531202	x-refsource-misc
https://github.com/asterisk/asterisk/commit/eaa108c68a32c080d7a168ef1d8bf784d5d830f4	x-refsource-misc
https://github.com/asterisk/asterisk/commit/eef894282be203cb9e6d8e9692e9c360a0b569b4	x-refsource-misc
https://github.com/asterisk/asterisk/commit/fde69a1f3ff17f507a1578ae27b528f43ceb5efd	x-refsource-misc
https://github.com/asterisk/asterisk/releases/tag/20.20.1	x-refsource-misc
https://github.com/asterisk/asterisk/releases/tag/21.12.3	x-refsource-misc
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.