CVE-2026-58049

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.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/rasc.c
https://github.com/bikini/exploitarium/tree/main/ffmpeg-rasc-dlta-calc-poc
https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-in-rasc-decoder-decode-dlta
https://access.redhat.com/errata/RHSA-2026:43711
https://access.redhat.com/errata/RHSA-2026:51180
https://access.redhat.com/errata/RHSA-2026:52832
https://access.redhat.com/errata/RHSA-2026:52833
https://access.redhat.com/errata/RHSA-2026:60520
https://access.redhat.com/errata/RHSA-2026:61627
https://access.redhat.com/errata/RHSA-2026:61628
https://access.redhat.com/errata/RHSA-2026:61629
https://access.redhat.com/security/cve/CVE-2026-58049
https://bugzilla.redhat.com/show_bug.cgi?id=2493952
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-58049.json

Configurations

No configuration.

History

No history.

Information

Published : 2026-06-28 02:16

Updated : 2026-09-01 13:19

NVD link : CVE-2026-58049

Mitre link : CVE-2026-58049

CVE.ORG link : CVE-2026-58049

JSON object : View

Products Affected

No product.

CWE

CWE-787

Out-of-bounds Write

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"disclosure@vulncheck.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:43711", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:51180", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:52832", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:52833", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60520", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:61627", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:61628", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:61629", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-58049", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2493952", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-58049.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-787"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-787"}]}], "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."}], "lastModified": "2026-09-01T13:19:51.890", "sourceIdentifier": "disclosure@vulncheck.com"}