Description
A use-after-free in res_pjsip_pubsub.c in Sangoma Asterisk 16.28, 18.14, 19.6, and certified/18.9-cert2 may allow a remote authenticated attacker to crash Asterisk (denial of service) by performing activity on a subscription via a reliable transport at the same time that Asterisk is also performing activity on that subscription.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | asterisk | 1:20.0.1~dfsg+~cs6.12.40431414-1 | — |
| Debian 11 | asterisk | 1:16.28.0~dfsg-0+deb11u2 | DSA-5358-1 |
| Debian 10 | asterisk | 1:16.28.0~dfsg-0+deb10u2 | DLA-3335-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | asterisk | No fix yet | — |
| Ubuntu 26.04 LTS | asterisk | No fix yet | — |
| Ubuntu 25.10 | asterisk | No fix yet | — |
| Ubuntu 24.04 LTS | asterisk | No fix yet | — |
| Ubuntu 22.04 LTS | asterisk | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | asterisk | No fix yet | — |
| Ubuntu 18.04 LTS | asterisk | No fix yet | — |
| Ubuntu Pro 16.04 LTS | asterisk | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | asterisk | 18.15.1-r0 | — |
| Alpine v3.23 | asterisk | 18.15.1-r0 | — |
| Alpine v3.22 | asterisk | 18.15.1-r0 | — |
| Alpine v3.21 | asterisk | 18.15.1-r0 | — |
| Alpine v3.20 | asterisk | 18.15.1-r0 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | asterisk | 18.15.1-r0 | — |
| Alpine v3.18 | asterisk | 18.15.1-r0 | — |
| Alpine v3.17 | asterisk | 18.15.1-r0 | — |
| Alpine v3.16 | asterisk | 18.20.2-r0 | — |
Advisories 3
- WID-SEC-2022-2218 Asterisk: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026
- DSA-5358-1 asterisk - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3335-1 asterisk - security update Debian Security (DSA / DLA) · Mar 9, 2026