Out-of-bounds Read in Rdesktop
CVE-2026-112277
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.
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
- hackmd.io/@haindpwn/rdesktop-bitmap-decompress-oob-read (third-party-advisory)
- github.com/rdesktop/rdesktop/issues/436 (issue-tracking)
- github.com/rdesktop/rdesktop/pull/437 (issue-tracking, patch)
- github.com/rdesktop/rdesktop/blob/v1.9.0/bitmap.c (technical-description)
- www.vulncheck.com/advisories/rdesktop-through-1.9.0-heap-out-of-bounds-read-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-112277?
- CVE-2026-112277 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-2026-112277?
- Medium severity. CVSS v3 base score is 6.5 out of 10.