CVE-2026-23740
published 2026-02-06CVE-2026-23740: Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, when…
PriorityP344high7.8CVSS 3.1
AVLACLPRNUIRSUCHIHAH
EPSS
0.11%
1.6th percentile
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, when ast_coredumper writes its gdb init and output files to a directory that is world-writable (for example /tmp), an attacker with write permission(which is all users on a linux system) to that directory can cause root to execute arbitrary commands or overwrite arbitrary files by controlling the gdb init file and output paths. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
Affected
16 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| asterisk | asterisk | < 23.2.2 | 23.2.2 |
| asterisk | asterisk | < 22.8.2 | 22.8.2 |
| asterisk | asterisk | < 21.12.1 | 21.12.1 |
| asterisk | asterisk | < 20.18.2 | 20.18.2 |
| asterisk | asterisk | < 20.7-cert9 | 20.7-cert9 |
| asterisk | asterisk | >= 0 < 1:16.28.0~dfsg-0+deb11u9 | 1:16.28.0~dfsg-0+deb11u9 |
| debian | asterisk | < asterisk 1:16.28.0~dfsg-0+deb11u9 (bullseye) | asterisk 1:16.28.0~dfsg-0+deb11u9 (bullseye) |
| sangoma | asterisk | < 20.18.2 | 20.18.2 |
| sangoma | asterisk | >= 21.0.0 < 21.12.1 | 21.12.1 |
| sangoma | asterisk | >= 22.0.0 < 22.8.2 | 22.8.2 |
| sangoma | asterisk | >= 23.0.0 < 23.2.2 | 23.2.2 |
| sangoma | certified_asterisk | — | — |
| sangoma | certified_asterisk | — | — |
| sangoma | certified_asterisk | — | — |
| sangoma | certified_asterisk | — | — |
| sangoma | certified_asterisk | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_debian7.8NONE
vendor_redhat7.8NONE
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Red Hat
Asterisk: Asterisk: Arbitrary code execution and file overwrite as root via insecure ast_coredumper file handling
vendor_redhat·2026-02-06·CVSS 7.8
CVE-2026-23740 [NONE] CWE-379 Asterisk: Asterisk: Arbitrary code execution and file overwrite as root via insecure ast_coredumper file handling
Asterisk: Asterisk: Arbitrary code execution and file overwrite as root via insecure ast_coredumper file handling
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, when ast_coredumper writes its gdb init and output files to a directory that is world-writable (for example /tmp), an attacker with write permission(which is all users on a linux system) to that directory can cause root to execute arbitrary commands or overwrite arbitrary files by controlling the gdb init file and output paths. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
A flaw was found in Asterisk. When the ast_coredumper writes its gdb init and output files to a world-writable directory,
Debian
CVE-2026-23740: asterisk - Asterisk is an open source private branch exchange and telephony toolkit. Prior ...
vendor_debian·2026·CVSS 7.8
CVE-2026-23740 [NONE] CVE-2026-23740: asterisk - Asterisk is an open source private branch exchange and telephony toolkit. Prior ...
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, when ast_coredumper writes its gdb init and output files to a directory that is world-writable (for example /tmp), an attacker with write permission(which is all users on a linux system) to that directory can cause root to execute arbitrary commands or overwrite arbitrary files by controlling the gdb init file and output paths. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
Scope: local
bullseye: resolved (fixed in 1:16.28.0~dfsg-0+deb11u9)
sid: resolved (fixed in 1:22.8.2+dfsg+~cs6.15.60671435-1)
OSV
CVE-2026-23740: Asterisk is an open source private branch exchange and telephony toolkit
osv·2026-02-06·CVSS 7.8
CVE-2026-23740 [HIGH] CVE-2026-23740: Asterisk is an open source private branch exchange and telephony toolkit
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, when ast_coredumper writes its gdb init and output files to a directory that is world-writable (for example /tmp), an attacker with write permission(which is all users on a linux system) to that directory can cause root to execute arbitrary commands or overwrite arbitrary files by controlling the gdb init file and output paths. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
No detection rules found.
No public exploits indexed.
Wiz
CVE-2026-23740 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 5.1
CVE-2026-23740 [MEDIUM] CVE-2026-23740 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-23740 :
NixOS vulnerability analysis and mitigation
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, when ast_coredumper writes its gdb init and output files to a directory that is world-writable (for example /tmp), an attacker with write permission(which is all users on a linux system) to that directory can cause root to execute arbitrary commands or overwrite arbitrary files by controlling the gdb init file and output paths. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
Source : NVD
## 7.8
Score
Published February 6, 2026
Severity HIGH
CNA Score N/A
Affected Technologies
NixOS
Linux Debian
Has Public Exploit No
Has CISA KEV Ex
Bugzilla
CVE-2026-23740 asterisk: Asterisk: Arbitrary code execution and file overwrite as root via insecure ast_coredumper file handling [fedora-42]
bugzilla·2026-02-09·CVSS 7.8
CVE-2026-23740 [HIGH] CVE-2026-23740 asterisk: Asterisk: Arbitrary code execution and file overwrite as root via insecure ast_coredumper file handling [fedora-42]
CVE-2026-23740 asterisk: Asterisk: Arbitrary code execution and file overwrite as root via insecure ast_coredumper file handling [fedora-42]
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.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan t
2026-02-06
Published