Description
Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.
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 | alpine | 2.25+dfsg1-1 | — |
| Debian 13 | alpine | 2.25+dfsg1-1 | — |
| Debian 12 | alpine | 2.25+dfsg1-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | alpine | 2.22+dfsg1-1ubuntu0.1~esm1 | USN-7360-1 |
| Ubuntu Pro 18.04 LTS | alpine | 2.21+dfsg1-1ubuntu0.1~esm1 | USN-7360-1 |
| Ubuntu Pro 16.04 LTS | alpine | 2.20+dfsg1-2ubuntu0.1~esm1 | USN-7360-1 |
Advisories 1
- USN-7360-1 alpine vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026