CVE-2026-112277 rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_plane
A malicious RDP server can crash rdesktop clients by sending malformed compressed bitmaps, causing a heap out-of-bounds read.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-112277?
CVE-2026-112277 is a high-severity memory corruption vulnerability in rdesktop, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in process_plane() in bitmap.c that allows malicious RDP servers to crash clients by sending malformed 32 bpp compressed bitmaps. Attackers can declare a large bitmap geometry with a short compressed body in bitmap update PDUs or bitmap cache orders, causing unbounded reads past the receive buffer and denial of service.
Weakness: CWE-125
Which versions are affected by CVE-2026-112277?
How do I fix CVE-2026-112277?
No fix has been published for CVE-2026-112277 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-112277 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112277 exists.
Sources
Also known as DEBIAN-CVE-2026-112277, GHSA-8gqw-q36r-ch2f, UBUNTU-CVE-2026-112277.