What is CVE-2026-57186?

CVE-2026-57186 is a high-severity vulnerability in Asterisk, classified under CWE-839. CVSS score: 7.5/10. Published 2026-10-27.

How severe is CVE-2026-57186?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Asterisk

CVE-2026-57186

Asterisk is an open source private branch exchange and telephony toolkit. From 21.0.0-pre1 until Asterisk 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 22.8-cert3, the `chan_ooh323` `Q.931 party-number parser` lacks the `CVE-2022-37325` fix because that fix was never forward-ported from Asterisk 20 to later versions. Malformed Q.931 elements in an `OOH323 request` can therefore crash Asterisk. This issue affects Asterisk versions greater than 20. The `chan_ooh323` addon channel driver must be explicitly compiled and installed, which is not the default, and its port must be publicly reachable. This issue is fixed in Asterisk 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 22.8-cert3.

Published 2026-10-27.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Asterisk — versions >= 21.0.0-pre1, < 21.12.3, >= 22.0.0-pre1, < 22.10.1, >= 23.0.0-pre1, < 23.4.1
Asterisk Certified-Asterisk — versions >= 22.8-cert1-pre1, < 22.8-cert3

Weakness classification (CWE)

CWE-839

References

Frequently asked questions

What is CVE-2026-57186?: CVE-2026-57186 is a high-severity vulnerability in Asterisk, classified under CWE-839. CVSS score: 7.5/10. Published 2026-10-27.
How severe is CVE-2026-57186?: High severity. CVSS v3 base score is 7.5 out of 10.