{"id":"CVE-2026-91954","title":"FreeRDP before 3.31.0 contains a null pointer dereference vulnerability in gdi_surface_bits when processing Surface Bits commands with NSCodec codec ID","summary":"FreeRDP before 3.31.0 contains a null pointer dereference vulnerability in gdi_surface_bits when processing Surface Bits commands with NSCodec codec ID. A malicious RDP server can crash a FreeRDP client by sending a crafted Surface Bits …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"freerdp","product":"freerdp","affected":["freerdp < 3.31.0"],"patched":["freerdp 3.31.0"],"published":"2026-09-15","updated":"2026-09-24","sourceUpdated":"2026-09-24T12:16:39.400","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91954","references":[{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-ffjr-p229-hpch","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-before-3.31.0-null-pointer-dereference-via-nscodec","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91954.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-91954"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533906"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91954"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91954"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00346,"epssPercentile":0.28234,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-17T19:15:29.879498Z"},"ingestedAt":"2026-09-15T15:39:12.918Z","slug":"CVE-2026-91954","body":"## Overview\n\nFreeRDP before 3.31.0 contains a null pointer dereference vulnerability in gdi_surface_bits when processing Surface Bits commands with NSCodec codec ID. A malicious RDP server can crash a FreeRDP client by sending a crafted Surface Bits command claiming to use NSCodec, even when the codec is disabled.\n\n## Affected\n\n- `freerdp < 3.31.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `freerdp 3.31.0`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91954.json)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}