Bug 2561041 (CVE-2026-57187)

Summary: CVE-2026-57187 asterisk: Asterisk: Denial of Service via premature disconnect during SIP INVITE handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Asterisk. This vulnerability allows an authenticated remote attacker to cause a Denial of Service (DoS) through a heap use-after-free memory error in the PJSIP communication handling component. By sending a Session Initiation Protocol (SIP) INVITE request over a connection-oriented transport and disconnecting before the server finishes responding, an attacker can crash the service and disrupt telephony operations.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2564794, 2564795, 2564796, 2564798    
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Description OSIDB Bzimport 2026-10-26 19:51:34 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-use-after-free in `PJSIP TCP/SDP` handling by sending a `SIP INVITE` over a connection-oriented transport and disconnecting before Asterisk responds with the `200 OK`. So far, the crash has only been reproduced when Asterisk is built with `Address Sanitizer`, which detects the issue. `Address Sanitizer` is a development tool with significant performance overhead and, according to the maintainer, is not used in production systems. 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.