Description
telnet in GNU inetutils through 2.7 allows servers to read arbitrary environment variables from clients via NEW_ENVIRON SEND USERVAR.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GNU | inetutils | ≤ 2.7 | — |
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 | inetutils | 2:2.7-5 | — |
| Debian 13 | inetutils | 2:2.6-3+deb13u3 | — |
| Debian 12 | inetutils | 2:2.4-2+deb12u3 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | inetutils | 2:2.7-2ubuntu1.1 | USN-8387-1 |
| Ubuntu 25.10 | inetutils | 2:2.6-1ubuntu3.2 | USN-8387-1 |
| Ubuntu 24.04 LTS | inetutils | 2:2.5-3ubuntu4.2 | USN-8387-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | inetutils | 2:2.2-2ubuntu0.2+esm1 | USN-8387-1 |
| Ubuntu Pro 20.04 LTS | inetutils | 2:1.9.4-11ubuntu0.2+esm4 | USN-8387-1 |
| Ubuntu Pro 18.04 LTS | inetutils | 2:1.9.4-3ubuntu0.1+esm5 | USN-8387-1 |
| Ubuntu Pro 16.04 LTS | inetutils | 2:1.9.4-1ubuntu0.1~esm6 | USN-8387-1 |
| Ubuntu Pro 14.04 LTS | inetutils | 2:1.9.2-1ubuntu0.1~esm4 | USN-8387-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | inetutils-telnet | 2.8-r0 | — |
Advisories 2
- USN-8387-1 inetutils vulnerabilities Ubuntu Security Notices (USN) · Jun 8, 2026
- WID-SEC-2026-0734 GNU InetUtils: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 8, 2026