Out-of-bounds Read in Rdesktop
CVE-2026-112279
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/rdesktop/rdesktop/blob/v1.9.0/orders.c (technical-description)
- github.com/rdesktop/rdesktop/issues/436 (issue-tracking)
- github.com/rdesktop/rdesktop/pull/437 (issue-tracking, patch)
- hackmd.io/@haindpwn/rdesktop-bitmap-decompress-oob-read (third-party-advisory)
- www.vulncheck.com/advisories/rdesktop-through-1.9.0-heap-out-of-bounds-read-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-112279?
- CVE-2026-112279 is a medium-severity vulnerability in Rdesktop, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-10-19.
- How severe is CVE-2026-112279?
- Medium severity. CVSS v3 base score is 6.5 out of 10.