Description
APT before 1.0.4 does not properly validate source packages, which allows man-in-the-middle attackers to download and install Trojan horse packages by removing the Release signature.
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 | 1.0.4 | — |
| Debian 13 | apt | 1.0.4 | — |
| Debian 12 | apt | 1.0.4 | — |
| Debian 7 | apt | 0.9.7.9+deb7u2 | DSA-2958-1 |
| Debian 6.0 | apt | 0.8.10.3+squeeze2 | DLA-0005-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | apt | 1.0.1ubuntu2.1 | USN-2246-1 |
Advisories 3
- USN-2246-1 apt vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-2958-1 apt - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-0005-1 apt - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- 58843 third-party-advisory
- 59358 third-party-advisory
- DSA-2958 vendor-advisory
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=749795
- USN-2246-1 vendor-advisory