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CVE-2026-66039

FFmpeg through 8.1.2, fixed in commit aafb5c6, contains a signed integer overflow vulnerability in the MACE6 audio decoder that allows attackers to corrupt heap memory by supplying a crafted CAF file with a malicious bytes_per_packet value. Attackers can craft a CAF file with oversized bytes_per_packet and frames_per_packet values in the desc chunk to trigger an integer overflow in mace_decode_frame() during output sample count computation, resulting in an undersized buffer allocation and heap o
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:de65cf1c2ff0f170fe30f8032a6bbf7265c4d2c1e193cff0919d8c4facb9d570
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/metrics/0/cvssV4_0
cwe · 2 assertions

{"cweId":"CWE-122","description":"Heap-based Buffer Overflow","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/problemTypes/0/descriptions/1

{"cweId":"CWE-190","description":"Integer Overflow or Wraparound","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"defaultStatus":"affected","product":"FFmpeg","repo":"https://code.ffmpeg.org/FFmpeg/FFmpeg","vendor":"FFmpeg","versions":[{"lessThanOrEqual":"8.1.2","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"aafb5c655edc76a753275c383ebb139feb032718","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-122","description":"Heap-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/problemTypes/0/descriptions/1
{"cweId":"CWE-190","description":"Integer Overflow or Wraparound","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"Patch Commit","tags":["patch"],"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/aafb5c655edc76a753275c383ebb139feb032718"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/references/1
{"name":"Pull Request","tags":["issue-tracking"],"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23631"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/ffmpeg-mace6-audio-decoder-heap-out-of-bounds-write-via-caf-file"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:891f4cb43a8eb1dff6fcdf8a2860acafd928f8fa8a5c0dd2374bd954139470f6 · sha256:00488508f0962c7c… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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