Description
Transmission through 2.92 relies on X-Transmission-Session-Id (which is not a forbidden header for Fetch) for access control, which allows remote attackers to execute arbitrary RPC commands, and consequently write to arbitrary files, via POST requests to /transmission/rpc in conjunction with a DNS rebinding attack.
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 | transmission | 2.92-3 | — |
| Debian 13 | transmission | 2.92-3 | — |
| Debian 12 | transmission | 2.92-3 | — |
| Debian 9 | transmission | 2.92-2+deb9u1 | DSA-4087-1 |
| Debian 8 | transmission | 2.84-0.2+deb8u1 | DSA-4087-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | transmission | 2.52-3+nmu3 | DLA-1246-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | transmission | 2.84-3ubuntu3.1 | USN-3533-1 |
| Ubuntu 14.04 LTS | transmission | 2.82-1.1ubuntu3.2 | USN-3533-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | transmission | 3.00-2.8 | openSUSE-SU-2024:11474-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Transmission - RPC DNS Rebinding EDB-43665 · remote · Jan 11, 2018 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 4
- DSA-4087-1 transmission - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1246-1 transmission - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3533-1 transmission vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2024:11474-1 transmission-3.00-2.8 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1447
- 43665 exploit
- DSA-4087 vendor-advisory
- https://github.com/transmission/transmission/pull/468
- GLSA-201806-07 vendor-advisory
- https://twitter.com/taviso/status/951526615145566208
- [debian-lts-announce] 20180118 [SECURITY] [DLA 1246-1] transmission security update mailing-list