Vulnerability · Published Oct 19, 2026 · Assigned by VulnCheck
CVE-2026-112279rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_bmpcache2
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 0.3% (higher than 24% of all known vulnerabilities).
Official description
rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in process_bmpcache2() in orders.c that allows malicious RDP servers to crash clients via crafted revision-2 bitmap cache orders. Attackers can send an uncompressed order with large width/height or an underflowing mode nibble and short payload, causing memcpy() 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-2026-112279 |
| Debian:13 | rdesktop | no fix listed | DEBIAN-CVE-2026-112279 |
| Debian:14 | rdesktop | no fix listed | DEBIAN-CVE-2026-112279 |
| Ubuntu:22.04:LTS | rdesktop | no fix listed | UBUNTU-CVE-2026-112279 |
| Ubuntu:24.04:LTS | rdesktop | no fix listed | UBUNTU-CVE-2026-112279 |
| Ubuntu:26.04:LTS | rdesktop | no fix listed | UBUNTU-CVE-2026-112279 |
| Ubuntu:26.10 | rdesktop | no fix listed | UBUNTU-CVE-2026-112279 |
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/orders.c technical-description
- VulnCheck Advisory: rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_bmpcache2 third-party-advisory