What’s Vulnerable › Vulnerabilities

CVE-2026-112279: rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_bmpcache2

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-19 · updated 2026-10-19
• Weakness: CWE-125

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 products

• rdesktop: through 1.9.0

References

• https://github.com/rdesktop/rdesktop/blob/v1.9.0/orders.c
• https://github.com/rdesktop/rdesktop/issues/436
• https://github.com/rdesktop/rdesktop/pull/437
• https://hackmd.io/@haindpwn/rdesktop-bitmap-decompress-oob-read
• https://www.vulncheck.com/advisories/rdesktop-through-1.9.0-heap-out-of-bounds-read-via-process-bmpcache2
• https://hackmd.io/@haindpwn/rdesktop-bitmap-decompress-oob-read

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