{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-58049", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-06-28T00:55:25.425Z", "datePublished": "2026-06-28T01:32:52.900Z", "dateUpdated": "2026-06-28T01:32:52.900Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-06-28T01:32:52.900Z"}, "datePublic": "2026-06-26T00:00:00.000Z", "title": "FFmpeg - Out-of-Bounds Write in RASC Decoder decode_dlta()", "descriptions": [{"lang": "en", "value": "FFmpeg's RASC video decoder (decode_dlta in libavcodec/rasc.c) performs 32-bit reads and writes at the row cursor before the NEXT_LINE row-boundary check and validates the DLTA region in pixel rather than byte units, so a DLTA run on a PAL8 frame can access several bytes past the row allocation. A crafted media stream using the RASC FourCC, decoded by libavcodec, triggers a bitstream-controlled out-of-bounds heap write and adjacent out-of-bounds read, leading to memory corruption."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Out-of-bounds Write", "cweId": "CWE-787", "type": "CWE"}]}], "affected": [{"vendor": "FFmpeg", "product": "FFmpeg", "defaultStatus": "affected", "versions": [{"version": "0", "status": "affected", "versionType": "git", "lessThanOrEqual": "bcd2c69e087a09b07cf45c6bd2428ee1ccb2925c"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*"}]}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH"}}, {"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.8, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/bikini/exploitarium/tree/main/ffmpeg-rasc-dlta-calc-poc", "name": "Proof of Concept", "tags": ["exploit", "third-party-advisory"]}, {"url": "https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/rasc.c", "name": "libavcodec/rasc.c", "tags": ["product"]}, {"name": "VulnCheck Advisory: FFmpeg - Out-of-Bounds Write in RASC Decoder decode_dlta()", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-in-rasc-decoder-decode-dlta"}], "credits": [{"lang": "en", "value": "ashdfrkl", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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