Vulnerability · Published Oct 19, 2026 · Assigned by VulnCheck
CVE-2026-112277rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_plane
Medium 6.5
In plain English
A medium-severity out-of-bounds read in rdesktop from rdesktop. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rdesktop | no fix listed | DEBIAN-CVE-2026-112277 |
| Debian:13 | rdesktop | no fix listed | DEBIAN-CVE-2026-112277 |
| Debian:14 | rdesktop | no fix listed | DEBIAN-CVE-2026-112277 |
| Ubuntu:22.04:LTS | rdesktop | no fix listed | UBUNTU-CVE-2026-112277 |
| Ubuntu:24.04:LTS | rdesktop | no fix listed | UBUNTU-CVE-2026-112277 |
| Ubuntu:26.04:LTS | rdesktop | no fix listed | UBUNTU-CVE-2026-112277 |
| Ubuntu:26.10 | rdesktop | no fix listed | UBUNTU-CVE-2026-112277 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://hackmd.io/@haindpwn/rdesktop-bitmap-decompress-oob-read third-party-advisory
- https://github.com/rdesktop/rdesktop/issues/436 issue-tracking
- https://github.com/rdesktop/rdesktop/pull/437 patch, issue-tracking
- https://github.com/rdesktop/rdesktop/blob/v1.9.0/bitmap.c technical-description
- VulnCheck Advisory: rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_plane third-party-advisory