Description
BarnOwl before 1.6.2 does not check the return code of calls to the (1) ZPending and (2) ZReceiveNotice functions in libzephyr, which allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unknown vectors.
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 | barnowl | 1.6.2-1 | — |
| Debian 13 | barnowl | 1.6.2-1 | — |
| Debian 12 | barnowl | 1.6.2-1 | — |
| Debian 5.0 | barnowl | 1.0.1-4+lenny2 | DSA-2102-1 |
Advisories 1
- DSA-2102-1 barnowl - arbitrary code execution Debian Security (DSA / DLA) · Mar 9, 2026