High severity · published Oct 27, 2026
CVE-2026-57188
Asterisk: Stack buffer overflow in res_xmpp XMPP namespace prefix handling
New
7.1
CVSS
–
EPSS
No
On KEV
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 authenticated attacker may cause a stack buffer overflow in `res_xmpp` `XMPP namespace prefix` handling using carefully crafted packets. The `res_xmpp` module must be loaded, an XMPP connection must be configured in `xmpp.conf`, and the attacker must have an XMPP account on the same or a federated server. 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.
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
asterisk · asterisk
< 20.20.1; >= 21.0.0-pre1, < 21.12.3; >= 22.0.0-pre1, < 22.10.1; >= 23.0.0-pre1, < 23.4.1 · source: vendor
CE
certified-asterisk · asterisk
< 20.7-cert11; >= 22.8-cert1-pre1, < 22.8-cert3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57188
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57188
github.com
https://github.com/asterisk/asterisk/commit/12072a559f592736a44dd9fbe1594e84714edfb4
github.com
https://github.com/asterisk/asterisk/commit/1328dbb503da4aa11a480a9c28e170f17e5f4e84
github.com
https://github.com/asterisk/asterisk/commit/3c4b08cf94eeaa3faefb3ae6c2d6ce1bd9747a13
github.com
https://github.com/asterisk/asterisk/commit/433102c16b8edfc31d28c96166fef03fe72fb923
github.com
https://github.com/asterisk/asterisk/commit/5e626250628b2579530f3f17e7b0aa37d082873b
github.com
https://github.com/asterisk/asterisk/commit/d570a85e45153a36919ace5d0ab06a195b30f9d1
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