Bug 2562440 (CVE-2026-57192)

Summary: CVE-2026-57192 asterisk: asterisk: Denial of Service via heap buffer overflow in Codec 2 decoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Asterisk. An authenticated remote attacker can cause a Denial of Service (DoS) via a heap-based buffer overflow in the Codec 2 audio decoder. Due to a sample-count calculation mismatch, an attacker can establish a call and transmit specially crafted audio packets to corrupt memory and crash the service.
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Bug Depends On: 2564879, 2564881, 2564882, 2564884    
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Description OSIDB Bzimport 2026-10-27 21:42:33 UTC 
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.