CVE-2026-57192
Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| asterisk asterisk |
< 20.20.1 (affected) >= 21.0.0-pre1, < 21.12.3 (affected) >= 22.0.0-pre1, < 22.10.1 (affected) >= 23.0.0-pre1, < 23.4.1 (affected) |
CNA: GitHub_M |
| certified-asterisk asterisk |
< 20.7-cert11 (affected) >= 22.8-cert1-pre1, < 22.8-cert3 (affected) |
CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.0 medium |
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/asterisk/asterisk/security/advisories/GHSA-qf8j-jp7h-c5hxCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/asterisk/asterisk/commit/02e2d8d51efe1f811f2929224339cb1a35ffc079CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/4f5cad0611c67638a0a61cfedbe645045da8dd56CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/9b085d48fb66e90a0740ea59e26840421fd07acbCNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/a0bc717b2261f4df7cdecc22b58a5fffbd1aa398CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/a2f1cc611f7d0f21faa03e8535009df3041c434cCNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/aa40bc599a8e628859ef1c4fc944261423ceac0dCNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/d4ccfd55ffd7cf6d73a6e5cde347a7464c301006CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/20.20.1CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/21.12.3CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/22.10.1CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/23.4.1CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/tree/24.0.0-pre1CNA: GitHub_M · x_refsource_MISC
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