Description
APT before 1.0.9 does not verify downloaded files if they have been modified as indicated using the If-Modified-Since header, which has unspecified impact and attack 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 | apt | 1.0.9 | — |
| Debian 13 | apt | 1.0.9 | — |
| Debian 12 | apt | 1.0.9 | — |
| Debian 7 | apt | 0.9.7.9+deb7u3 | DSA-3025-1 |
| Debian 6.0 | apt | 0.8.10.3+squeeze3 | DLA-53-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | apt | 1.0.1ubuntu2.3 | USN-2348-1 |
Advisories 3
- USN-2348-1 apt vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-53-1 apt - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3025-1 apt - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- 61286 third-party-advisory
- 61275 third-party-advisory
- USN-2348-1 vendor-advisory
- DSA-3025 vendor-advisory