CVE-2026-57201 Asterisk: Stack Buffer Overflow in H.323 ooTrace() via Unbounded vsprintf into Fixed 2048-byte Buffer
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-57201?
CVE-2026-57201 is a high-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, a stack buffer overflow in the H.323 `ooTrace()` trace-logging function can occur when unbounded `vsprintf` writes into a fixed `2048-byte buffer`. A remote attacker may send a carefully crafted packet that causes the Asterisk process to crash. The `chan_ooh323` addon channel driver must be explicitly compiled and installed, which is not the default, and its port must be publicly reachable. 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.
Weakness: CWE-787
Which versions are affected by CVE-2026-57201?
How do I fix CVE-2026-57201?
Upgrade to a fixed version.
Is CVE-2026-57201 being exploited?
There is no known exploitation of CVE-2026-57201 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-57201, GHSA-x348-j6c9-77f3, UBUNTU-CVE-2026-57201.