Vulnerability · Published Oct 19, 2026 · Assigned by VulnCheck
CVE-2026-112278rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_raw_bmpcache
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).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 76.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in process_raw_bmpcache() in orders.c that allows malicious RDP servers to crash clients. Attackers can send a raw bitmap cache order declaring large width, height, and bpp values with a tiny payload, causing memcpy() to read past the receive buffer and crash the client.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rdesktop | no fix listed | DEBIAN-CVE-2026-112278 |
| Debian:13 | rdesktop | no fix listed | DEBIAN-CVE-2026-112278 |
| Debian:14 | rdesktop | no fix listed | DEBIAN-CVE-2026-112278 |
| Ubuntu:22.04:LTS | rdesktop | no fix listed | UBUNTU-CVE-2026-112278 |
| Ubuntu:24.04:LTS | rdesktop | no fix listed | UBUNTU-CVE-2026-112278 |
| Ubuntu:26.04:LTS | rdesktop | no fix listed | UBUNTU-CVE-2026-112278 |
| Ubuntu:26.10 | rdesktop | no fix listed | UBUNTU-CVE-2026-112278 |
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/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_raw_bmpcache third-party-advisory
- https://hackmd.io/@haindpwn/cve-2026-112277-112278-112279-rdesktop-bitmap-decompress-oob-read exploit