Description
apt-cacher before 1.7.15 and apt-cacher-ng before 3.4 allow HTTP response splitting via encoded newline characters, related to lack of blocking for the %0[ad] regular expression.
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-cacher | 1.7.15 | — |
| Debian 14 | apt-cacher-ng | 3-1 | — |
| Debian 13 | apt-cacher | 1.7.15 | — |
| Debian 13 | apt-cacher-ng | 3-1 | — |
| Debian 12 | apt-cacher | 1.7.15 | — |
| Debian 12 | apt-cacher-ng | 3-1 | — |
| Debian 7 | apt-cacher | 1.7.6+deb7u1 | DLA-873-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | apt-cacher-ng | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | apt-cacher | 1.7.11ubuntu0.16.04.1~esm1 | USN-8976-1 |
Advisories 2
- USN-8976-1 apt-cacher vulnerability Ubuntu Security Notices (USN) · Nov 4, 2026
- DLA-873-1 apt-cacher - security update Debian Security (DSA / DLA) · Mar 9, 2026