{"schema":"threatline.record/2","record":{"id":"CVE-2026-41210","aliases":["GHSA-5rvh-v25g-vrgv"],"summary":"Moonlight Qt: Remote heap buffer overflow in Moonlight Qt H.264 SPS fixup path via crafted seq_parameter_set_id","details":"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.","categories":["Unclassified"],"product":"moonlight-qt","vendor":"moonlight-stream","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-41210","source_modified_at":"2026-10-13T15:02:18.935Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"moonlight-qt","vendor":"moonlight-stream","versions":[{"version":"< 6.2.0","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":6.5,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00307,"percentile":0.22354,"score_date":"2026-10-23"},"published_at":"2026-10-12T21:25:03.303Z","modified_at":"2026-10-13T15:02:18.935Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-41210","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-13T15:02:18.935Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-41210","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/moonlight-stream/moonlight-qt/security/advisories/GHSA-5rvh-v25g-vrgv","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/moonlight-stream/moonlight-qt/commit/3e24a7a1a5369163482ce5a76d5232536e03c53f","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/moonlight-stream/moonlight-qt/commit/b7adc70ea474f7448c6185081ad9fc87b0b47cf0","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/moonlight-stream/moonlight-qt/releases/tag/v6.2.0","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-13T15:02:04.501291Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-13T15:02:18.935Z","content_hash":"7e863c3ebb82a049b4a9c9f0a2d66bd7b9131e735b031e73c8b8fb9884ce2ffe"}}