CVE-2026-57189 Asterisk: Possible RED T.140 Generation Accumulation OOB Write
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-57189?
CVE-2026-57189 is a low-severity vulnerability in asterisk, published on 27 Oct 2026.
Official description
Asterisk is an open source private branch exchange and telephony toolkit. In affected deployments, an authenticated attacker may cause a `T.140 RED` out-of-bounds write during `generation accumulation` using carefully crafted packets, potentially allowing remote code execution or causing Asterisk to crash. The `chan_sip` channel driver must be installed and configured, and its `textsupport` option must be enabled; `textsupport` defaults to no. `The chan_sip driver was deprecated in Asterisk 20 and completely removed in all later versions.` Repository comparisons verify patch containment in Asterisk 20.20.1, 21.12.3, 22.10.1 and 23.4.1, and Certified Asterisk 20.7-cert11 and 22.8-cert3. The affected release-track scope remains unresolved: structured metadata includes later release tracks even though the advisory says the required `chan_sip` driver was removed there.
Weakness: CWE-787
Which versions are affected by CVE-2026-57189?
How do I fix CVE-2026-57189?
Upgrade to a fixed version.
Is CVE-2026-57189 being exploited?
There is no known exploitation of CVE-2026-57189 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-57189, GHSA-j2mm-57pq-jh94, UBUNTU-CVE-2026-57189.