{"id":"CVE-2026-109256","title":"FreeRDP 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR png_write_data callback that writes past the buffer after a realloc failure","summary":"FreeRDP 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR png_write_data callback that writes past the buffer after a realloc failure. A malicious RDP clipboard peer can supply a large CF_DIB image that triggers out-of-b…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-122","CWE-787"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-10-12","updated":"2026-10-14","sourceUpdated":"2026-10-14T20:11:45.520","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109256","references":[{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-wf3x-658c-52m5","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-3.10.0-through-3.32.2-heap-buffer-overflow-in-winpr-png-conversion","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109256.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-109256"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2549835"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-109256"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109256"}],"tags":["nvd","csaf","vex","red-hat","cve.org","exploit-available"],"epss":0.00307,"epssPercentile":0.23395,"ingestedAt":"2026-10-12T18:00:08.178Z","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-18T11:37:58.517960Z"},"slug":"CVE-2026-109256","body":"## Overview\n\nFreeRDP 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR png_write_data callback that writes past the buffer after a realloc failure. A malicious RDP clipboard peer can supply a large CF_DIB image that triggers out-of-bounds memcpy during PNG conversion, causing a client crash.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-13 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109256.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":224024,"id":"CVE-2026-109256","ts":1792323672489,"field":"exploit_available","old":"false","new":"true"}]}