Bug 2565641

Summary:	CVE-2026-57191 asterisk: Asterisk: Denial of Service via stack-based buffer overflow in res_pjsip_pubsub [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Srikanth Balasubramanian <sbalasub>
Component:	asterisk	Assignee:	Peter Lemenkov <lemenkov>
Status:	ON_QA ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	rawhide	CC:	bennie.joubert, 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 08:40:49 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 18:53:12 UTC

FEDORA-2026-64401a578b (asterisk-18.26.4-2.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-64401a578b

Comment 2 Fedora Update System 2026-11-04 18:53:16 UTC

FEDORA-2026-3e65fe0daf (asterisk-18.26.4-2.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3e65fe0daf

Comment 3 Fedora Update System 2026-11-04 21:13:35 UTC

FEDORA-2026-715e85a80b (asterisk-18.26.4-3.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-715e85a80b

Comment 4 Fedora Update System 2026-11-05 03:11:05 UTC

FEDORA-2026-715e85a80b has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-715e85a80b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-715e85a80b

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 16:10:10 UTC

FEDORA-2026-011a22de5e has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-011a22de5e`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-011a22de5e

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