Bug 2564866

Summary:	CVE-2026-57195 asterisk: asterisk: Denial of Service via HTTP digest authentication in AMI [fedora-43]
Product:	[Fedora] Fedora	Reporter:	gkamathe
Component:	asterisk	Assignee:	Peter Lemenkov <lemenkov>
Status:	ON_QA ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	43	CC:	bennie.joubert, jsmith.fedora, lemenkov
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["5897a23b-8e14-497d-84bd-fba758823fee"]}
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2562437

Description gkamathe 2026-11-02 09:58:51 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, a NULL pointer dereference in the `Asterisk Manager Interface (AMI)` may allow an unauthenticated attacker to crash Asterisk when `Digest Authentication` is used via `HTTP`. The Asterisk `HTTP` web server, AMI, and AMI access via `HTTP` must all be enabled; each is disabled by default. The attacker must be able to connect to the `HTTP` server, which binds only to `127.0.0.1` by default even when enabled. 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 2026-11-02 14:52:54 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 2026-11-03 03:16:10 UTC

FEDORA-2026-64401a578b 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-2026-64401a578b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-64401a578b

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