Bug 2564881

Summary: CVE-2026-57192 asterisk: asterisk: Denial of Service via heap buffer overflow in Codec 2 decoder [epel-9]
Product: [Fedora] Fedora EPEL Reporter: gkamathe
Component: asteriskAssignee: EPEL Packagers SIG <epel-packagers-sig>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: epel9CC: bennie.joubert, epel-packagers-sig, jsmith.fedora, lemenkov
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["e252aa76-ab28-4b58-9025-ee9f98077007"]}
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Clone Of: Environment:
Last Closed: 2026-11-02 13:04:21 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2562440    

Description gkamathe 2026-11-02 10:00:17 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 authenticated attacker may cause a heap buffer overflow through an out-of-bounds write in the `Codec2` decoder caused by a `floor/ceil sample-count mismatch`. The `codec_codec2` module must be loaded and `Codec2` must be configured on the attacked endpoint. The attacker must pass SIP authentication by username/password or `source IP address matching`, establish a call using `Codec2`, and send carefully crafted `Codec2` audio packets. 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 Peter Lemenkov 2026-11-02 13:04:21 UTC 
Not affected. The flaw is in the Codec 2 decoder module (codecs/codec_codec2.c). The asterisk package on this branch is built without Codec 2 support (no libcodec2 build dependency), so codec_codec2 is not shipped in any asterisk-18.26.4 subpackage.