Is CVE-2026-57194 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-57194 being exploited in the wild.

How severe is CVE-2026-57194?

Medium severity, with a CVSS score of 5.9, published 27 October 2026.

Which products and versions are affected?

Asterisk before 20.20.1, 21.12.3, 22.10.1, 23.4.1; Asterisk Certified Asterisk before 20.7-cert11, 22.8-cert3.

Is there a fix for CVE-2026-57194?

Yes: fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1; Certified Asterisk 20.7-cert11, 22.8-cert3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-57194 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-57194?

Check whether you run Asterisk or Asterisk Certified Asterisk at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-57194: Asterisk out-of-bounds write in chan_unistim DIALPAGE handling

CVE-2026-57194 · Severity: medium · CVSS 5.9 · Published 2026-10-27

Asterisk is an open-source phone system and telephony toolkit used by organizations to handle call routing and VoIP communications. An attacker who can send specially crafted packets to the UNISTIM module can cause a buffer overflow that crashes the Asterisk service, leading to loss of phone system availability. The attack requires either network access to a configured UNISTIM UDP port and a valid phone MAC address, or access through an autoprovisioning path.

Technologies: Asterisk, Asterisk Certified Asterisk. Vendors: Asterisk.

Quick answers

Is CVE-2026-57194 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-57194 being exploited in the wild.
How severe is CVE-2026-57194?: Medium severity, with a CVSS score of 5.9, published 27 October 2026.
Which products and versions are affected?: Asterisk before 20.20.1, 21.12.3, 22.10.1, 23.4.1; Asterisk Certified Asterisk before 20.7-cert11, 22.8-cert3.
Is there a fix for CVE-2026-57194?: Yes: fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1; Certified Asterisk 20.7-cert11, 22.8-cert3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-57194 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-57194?: Check whether you run Asterisk or Asterisk Certified Asterisk at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1; Certified Asterisk 20.7-cert11, 22.8-cert3

Technical details

An out-of-bounds write vulnerability exists in the chan_unistim module's key_dial_page() function, where digit input handling fails to validate bounds on the phone_number buffer field. An attacker sending a carefully crafted incoming request packet with excessive dial digits can overflow this buffer and crash the Asterisk process. The attack requires the chan_unistim module to be loaded and configured with an accessible UNISTIM UDP port, and either valid phone MAC registration or an autoprovisioning path.

Affected products

Asterisk Asterisk before 20.20.1, 21.12.3, 22.10.1, 23.4.1
Asterisk Certified Asterisk before 20.7-cert11, 22.8-cert3

Timeline

2026-10-27: disclosed

References

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