Description
Alpine before 2.23 silently proceeds to use an insecure connection after a /tls is sent in certain circumstances involving PREAUTH, which is a less secure behavior than the alternative of closing the connection and letting the user decide what they would like to do.
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 | 2.23+dfsg1-1 | — |
| Debian 13 | alpine | 2.23+dfsg1-1 | — |
| Debian 12 | alpine | 2.23+dfsg1-1 | — |
| Debian 8 | alpine | 2.11+dfsg1-3+deb8u1 | DLA-2254-1 |
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 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP2 | alpine | 2.24-bp152.4.3.1 | openSUSE-SU-2021:0695-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.2 | alpine | 2.24-lp152.5.3.1 | openSUSE-SU-2021:0675-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | alpine | 2.23-r0 | — |
| Alpine v3.23 | alpine | 2.23-r0 | — |
| Alpine v3.22 | alpine | 2.23-r0 | — |
| Alpine v3.21 | alpine | 2.23-r0 | — |
| Alpine v3.20 | alpine | 2.23-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | alpine | 2.23-r0 | — |
| Alpine v3.18 | alpine | 2.23-r0 | — |
| Alpine v3.17 | alpine | 2.23-r0 | — |
| Alpine v3.16 | alpine | 2.23-r0 | — |
| Alpine v3.15 | alpine | 2.23-r0 | — |
| Alpine v3.14 | alpine | 2.23-r0 | — |
| Alpine v3.13 | alpine | 2.23-r0 | — |
| Alpine v3.12 | alpine | 2.23-r0 | — |
Advisories 4
- USN-7360-1 alpine vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-2254-1 alpine - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:0695-1 Security update for alpine SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0675-1 Security update for alpine SUSE / openSUSE Security Updates · Feb 4, 2026