CVE-2026-57192 Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-57192?
CVE-2026-57192 is a medium-severity vulnerability in asterisk, published on 27 Oct 2026.
Official 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 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.
Which versions are affected by CVE-2026-57192?
How do I fix CVE-2026-57192?
Upgrade to a fixed version.
Is CVE-2026-57192 being exploited?
There is no known exploitation of CVE-2026-57192 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-57192, GHSA-qf8j-jp7h-c5hx, UBUNTU-CVE-2026-57192.