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CVE-2026-57191— Asterisk: Stack buffer overflow in MWI NOTIFY Message-Account parsing

Quick assessment

Affected

asterisk asterisk

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Asterisk 是一款开源的专用交换机和电话系统工具包。在 Asterisk 20.20.1、21.12.3、22.10.1、23.4.1 以及认证版 Asterisk 20.7-cert11、22.8-cert3 之前的版本中，模块在解析消息的字段时，存在一个无界调用。该漏洞允许未认证的攻击者发送精心构造的数据包，从而引发栈缓冲区溢出，破坏底层传输层，导致所有 SIP 功能永久性失效。必须重启 Asterisk 服务才能恢复完整功能。该问题已在 Asterisk 20.20.1、21.12.3、22.1

CVSS 8.2 · High Updated Oct 28, 2026

Possible ATT&CK Techniques 2 AI

T1588 · Obtain Capabilities T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Asterisk: Stack buffer overflow in MWI NOTIFY Message-Account parsing

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
asterisk	asterisk	< 20.20.1	-
asterisk	certified-asterisk	< 20.7-cert11	-

II. Public POCs for CVE-2026-57191

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-57191

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Vendor Pages for CVE-2026-57191 (7)

🔗 GitHub - asterisk/asterisk at 24.0.0-pre1 · GitHub x_refsource_MISC
🔗 Release Asterisk Release 23.4.1 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release 21.12.3 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release 20.20.1 · asterisk/asterisk · GitHub Read full article x_refsource_MISC
🔗 Release Asterisk Release 22.10.1 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release certified-22.8-cert3 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release certified-20.7-cert11 · asterisk/asterisk · GitHub x_refsource_MISC

Other References for CVE-2026-57191 (8)

https://github.com/asterisk/asterisk/security/advisories/GHSA-589g-qgf8-m6mx x_refsource_CONFIRM
https://github.com/asterisk/asterisk/commit/b4be3bd67ce4ac35b94fbfa860cdd9e1c906610b x_refsource_MISC
https://github.com/asterisk/asterisk/commit/b5281828dad7d44658439ba6393fe6be3328a4bd x_refsource_MISC
https://github.com/asterisk/asterisk/commit/0e89514084490070c5ecee419ec5ee37b7c49528 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/ee1b66a5e40733ba0b9fad7fc4d032cabbe1dd75 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/647b35c3cfd4a2cc3b1fb7560b085feba5c24b4b x_refsource_MISC
https://github.com/asterisk/asterisk/commit/7a1ffcdf38cc76d1c4eae51651667f3fd4548ab0 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/dca516f6d895e8867d48fa56b6ce7f05b6f7457a x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-57191

Same Patch Batch · asterisk · 2026-10-27 · 16 CVEs total

CVE-2026-57202	8.1 HIGH	Asterisk: ARI setChannelVar bypasses live_dangerously and permits FILE() writes
CVE-2026-57197	7.7 HIGH	Asterisk: Heap Buffer Overflow in OGG/Speex File Playback (format_ogg_speex)
CVE-2026-57201	7.5 HIGH	Asterisk: Stack Buffer Overflow in H.323 ooTrace() via Unbounded vsprintf into Fixed 2048-
CVE-2026-57195	7.5 HIGH	Asterisk: NULL Pointer Dereference in HTTP AMI Digest Authentication
CVE-2026-57200	7.5 HIGH	Asterisk: ARI REST-over-WebSocket read-only bypass allows arbitrary module path load and c
CVE-2026-57186	7.5 HIGH	Asterisk: CVE-2022-37325 fix is absent from current chan_ooh323 Q.931 party-number parser
CVE-2026-57188	7.1 HIGH	Asterisk: Stack buffer overflow in res_xmpp XMPP namespace prefix handling
CVE-2026-57190	7.0 HIGH	Asterisk: SQL Injection in cel_pgsql and cel_tds via CELGenUserEvent eventtype Field
CVE-2026-57203	6.9 MEDIUM	Asterisk: Local privilege escalation through ast_loggrabber's world-writable helper locati
CVE-2026-57185	6.5 MEDIUM	Asterisk: Buffer over-read in Asterisk PJSIP MWI body parser
CVE-2026-57192	6.0 MEDIUM	Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch
CVE-2026-57194	5.9 MEDIUM	Asterisk: chan_unistim DIALPAGE digit handling can overflow phone_number and crash Asteris
CVE-2026-57198	2.3 LOW	Asterisk: Possible RED T.140 Heap Buffer Overflow
CVE-2026-57189	2.3 LOW	Asterisk: Possible RED T.140 Generation Accumulation OOB Write
CVE-2026-57199	2.3 LOW	Asterisk: Asterisk app_sms.c copies externally controlled SMS lengths into fixed in-struct

IV. Related Vulnerabilities

Same product: asterisk

Same vendor: asterisk

Same weakness: CWE-120