Bug 2565640

Summary: CVE-2026-57191 asterisk: Asterisk: Denial of Service via stack-based buffer overflow in res_pjsip_pubsub [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Srikanth Balasubramanian <sbalasub>
Component: asteriskAssignee: EPEL Packagers SIG <epel-packagers-sig>
Status: ON_QA --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: epel10CC: bennie.joubert, epel-packagers-sig, jsmith.fedora, lemenkov
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["b6d71ea8-f205-4217-89e1-b60b9fe39b63"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2565372    

Description Srikanth Balasubramanian 2026-11-03 08:40:43 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, an unbounded `sscanf` in `res_pjsip_pubsub` when parsing the `MWI NOTIFY` `Message-Account` field may allow an unauthenticated attacker to send a carefully crafted packet that causes a stack buffer overflow and corrupts the underlying transport, permanently disabling all SIP functionality. An Asterisk restart is required to restore full operation. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.
Comment 1 Fedora Update System 2026-11-04 18:53:20 UTC 
FEDORA-EPEL-2026-002595a22b (asterisk-18.26.4-2.el9) has been submitted as an update to Fedora EPEL 9.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-002595a22b
Comment 2 Fedora Update System 2026-11-04 18:53:24 UTC 
FEDORA-EPEL-2026-b8c28d6a5b (asterisk-18.26.4-2.el8) has been submitted as an update to Fedora EPEL 8.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-b8c28d6a5b
Comment 3 Fedora Update System 2026-11-04 21:13:59 UTC 
FEDORA-EPEL-2026-4e6e6af48a (asterisk-18.26.4-3.el9) has been submitted as an update to Fedora EPEL 9.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-4e6e6af48a
Comment 4 Fedora Update System 2026-11-05 15:34:31 UTC 
FEDORA-EPEL-2026-ba6e61f1d3 has been pushed to the Fedora EPEL 8 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-ba6e61f1d3

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 5 Fedora Update System 2026-11-05 15:34:57 UTC 
FEDORA-EPEL-2026-4e6e6af48a has been pushed to the Fedora EPEL 9 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-4e6e6af48a

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.