EUVD-2026-47760
GHSA-p2v8-4c4f-rwpq
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Malicious file is delivered remotely (AV:N) but the victim must decode it (UI:R); no auth needed (PR:N); OOB write enables memory corruption with high C/I/A.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
FFmpeg versions 4.4 through 8.1.2 contain an out-of-bounds memory access vulnerability in the ADX audio decoder within libavcodec/adxdec.c that allows attackers to trigger both out-of-bounds reads and writes by supplying a crafted ADX or AAX audio file with a mid-stream channel layout change. When AV_PKT_DATA_NEW_EXTRADATA side data is received mid-stream, the adx_decode_frame function re-parses the stream header but fails to update the internal channel state, causing subsequent decoding operations to access the prev[] state array using a stale channel count.
AnalysisAI
Out-of-bounds read and write in the FFmpeg ADX audio decoder (libavcodec/adxdec.c) affects versions 4.4 through 8.1.2, where a mid-stream channel layout change corrupts memory. When AV_PKT_DATA_NEW_EXTRADATA side data arrives mid-stream, adx_decode_frame re-parses the header but leaves the internal channel state stale, so later decode operations index the prev[] state array with a wrong channel count. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to decode an attacker-supplied ADX or AAX audio file through FFmpeg's ADX decoder, and the file must deliver an AV_PKT_DATA_NEW_EXTRADATA side-data block mid-stream that changes the channel layout - this specific mid-stream extradata channel-change is the concrete trigger, not merely a malformed file. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H) describes a network-reachable, low-complexity, unauthenticated flaw that requires passive user interaction - a victim must decode a malicious file - and yields high confidentiality, integrity, and availability impact with no scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious ADX or AAX audio file that begins with one channel layout and injects an AV_PKT_DATA_NEW_EXTRADATA side-data block mid-stream declaring a different channel count, then delivers it to a victim (email attachment, download, or an automated transcoding service). When FFmpeg decodes the file, adx_decode_frame re-parses the header without updating channel state and reads/writes the prev[] array out of bounds, causing a crash or potentially memory corruption leading to code execution. … |
| Remediation | Upstream fix available (PR/commit); released patched version not independently confirmed - apply the FFmpeg patch commit 1836ef96846937a6cc2443698a693104f5c0b21e (PR https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23659) or upgrade to a build that incorporates it once tagged. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems and applications running FFmpeg versions 4.4 through 8.1.2, particularly those processing untrusted or external audio content. …
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
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External POC / Exploit Code
Leaving vuln.today