{"id":"CVE-2026-41210","revision":"325bd129bee14a8d96a0dcaa6a2ef05e","records":[{"revision":"325bd129bee14a8d96a0dcaa6a2ef05e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-41210","aliases":[],"title":"Moonlight Qt: Remote heap buffer overflow in Moonlight Qt H.264 SPS fixup path via crafted seq_parameter_set_id","description":"Moonlight Qt is a GameStream client for Windows, macOS, Linux, and Steam Link. In version 6.1.0 and earlier, after a victim initiates a streaming session to a malicious host, the host can send a crafted H.264 SPS NAL when Moonlight selects a decoder path that does not advertise CAPABILITY_REFERENCE_FRAME_INVALIDATION_AVC. The SPS fixup path in app/streaming/video/ffmpeg.cpp parses the server-provided data with h264bitstream, where attacker-controlled seq_parameter_set_id is used to index the 32-entry sps_table without validation. A value of 32 or greater causes an out-of-bounds write and remote heap corruption in the Moonlight client. The demonstrated impact is a reliable client crash, while code execution is not established. This issue is fixed in version 6.2.0.","state":0,"publishedAt":"2026-10-12T21:25:03.303+00:00","modifiedAt":"2026-10-13T15:02:18.935+00:00","affected":[{"ecosystem":"Vendor product","name":"moonlight-qt","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"moonlight-stream\",\n                    \"product\": \"moonlight-qt\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 6.2.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/moonlight-stream/moonlight-qt/security/advisories/GHSA-5rvh-v25g-vrgv","https://github.com/moonlight-stream/moonlight-qt/commit/3e24a7a1a5369163482ce5a76d5232536e03c53f","https://github.com/moonlight-stream/moonlight-qt/commit/b7adc70ea474f7448c6185081ad9fc87b0b47cf0","https://github.com/moonlight-stream/moonlight-qt/releases/tag/v6.2.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-41210","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-41210","identifiers":["CVE-2026-41210"]},"retained":false,"historicalAffected":[]}],"coverage":[]}