Description
The mirror:// method implementation in Advanced Package Tool (APT) 1.6.x before 1.6.4 and 1.7.x before 1.7.0~alpha3 mishandles gpg signature verification for the InRelease file of a fallback mirror, aka mirrorfail.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | APT 1.6.x before 1.6.4 and 1.7.x before 1.7.0~alpha3 | APT 1.6.x before 1.6.4 and 1.7.x before 1.7.0~alpha3 | — |
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 | apt | 1.6.4 | — |
| Debian 13 | apt | 1.6.4 | — |
| Debian 12 | apt | 1.6.4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | apt | 1.6.3ubuntu0.1 | USN-3746-1 |
Advisories 1
- USN-3746-1 apt vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026