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CVE-2026-20501 (GCVE-0-2026-20501)

Vulnerability from cvelistv5 – Published: 2026-09-07 01:57 – Updated: 2026-09-08 03:55
VLAI
Summary
In vdec, there is a possible out of bounds write due to a heap buffer overflow. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11262030; Issue ID: MSV-9197.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-07 00:00 UTC
CWE
  • CWE-122 - Heap-based Buffer Overflow
Assigner
References
Impacted products
Vendor Product Version CPE status
MediaTek, Inc. MediaTek chipset Affected: MT2718
Affected: MT6580
Affected: MT6739
Affected: MT6761
Affected: MT6765
Affected: MT6768
Affected: MT6769
Affected: MT6779
Affected: MT6781
Affected: MT6785
Affected: MT6789
Affected: MT6833
Affected: MT6835
Affected: MT6853
Affected: MT6855
Affected: MT6858
Affected: MT6873
Affected: MT6877
Affected: MT6878
Affected: MT6879
Affected: MT6881
Affected: MT6883
Affected: MT6885
Affected: MT6886
Affected: MT6889
Affected: MT6893
Affected: MT6895
Affected: MT6897
Affected: MT6899
Affected: MT6983
Affected: MT6985
Affected: MT6989
Affected: MT6991
Affected: MT6993
Affected: MT8126
Affected: MT8171
Affected: MT8186
Affected: MT8188
Affected: MT8189
Affected: MT8195
Affected: MT8196
Affected: MT8367
Affected: MT8391
Affected: MT8395
Affected: MT8668
Affected: MT8676
Affected: MT8678
Affected: MT8696
Affected: MT8781
Affected: MT8788E
Affected: MT8792
Affected: MT8799
Affected: MT8910
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.4, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20501\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-07T10:40:17.908575Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-07T10:40:13.154Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"MediaTek, Inc.\", \"product\": \"MediaTek chipset\", \"versions\": [{\"status\": \"affected\", \"version\": \"MT2718\"}, {\"status\": \"affected\", \"version\": \"MT6580\"}, {\"status\": \"affected\", \"version\": \"MT6739\"}, {\"status\": \"affected\", \"version\": \"MT6761\"}, {\"status\": \"affected\", \"version\": \"MT6765\"}, {\"status\": \"affected\", \"version\": \"MT6768\"}, {\"status\": \"affected\", \"version\": \"MT6769\"}, {\"status\": \"affected\", \"version\": \"MT6779\"}, {\"status\": \"affected\", \"version\": \"MT6781\"}, {\"status\": \"affected\", \"version\": \"MT6785\"}, {\"status\": \"affected\", \"version\": \"MT6789\"}, {\"status\": \"affected\", \"version\": \"MT6833\"}, {\"status\": \"affected\", \"version\": \"MT6835\"}, {\"status\": \"affected\", \"version\": \"MT6853\"}, {\"status\": \"affected\", \"version\": \"MT6855\"}, {\"status\": \"affected\", \"version\": \"MT6858\"}, {\"status\": \"affected\", \"version\": \"MT6873\"}, {\"status\": \"affected\", \"version\": \"MT6877\"}, {\"status\": \"affected\", \"version\": \"MT6878\"}, {\"status\": \"affected\", \"version\": \"MT6879\"}, {\"status\": \"affected\", \"version\": \"MT6881\"}, {\"status\": \"affected\", \"version\": \"MT6883\"}, {\"status\": \"affected\", \"version\": \"MT6885\"}, {\"status\": \"affected\", \"version\": \"MT6886\"}, {\"status\": \"affected\", \"version\": \"MT6889\"}, {\"status\": \"affected\", \"version\": \"MT6893\"}, {\"status\": \"affected\", \"version\": \"MT6895\"}, {\"status\": \"affected\", \"version\": \"MT6897\"}, {\"status\": \"affected\", \"version\": \"MT6899\"}, {\"status\": \"affected\", \"version\": \"MT6983\"}, {\"status\": \"affected\", \"version\": \"MT6985\"}, {\"status\": \"affected\", \"version\": \"MT6989\"}, {\"status\": \"affected\", \"version\": \"MT6991\"}, {\"status\": \"affected\", \"version\": \"MT6993\"}, {\"status\": \"affected\", \"version\": \"MT8126\"}, {\"status\": \"affected\", \"version\": \"MT8171\"}, {\"status\": \"affected\", \"version\": \"MT8186\"}, {\"status\": \"affected\", \"version\": \"MT8188\"}, {\"status\": \"affected\", \"version\": \"MT8189\"}, {\"status\": \"affected\", \"version\": \"MT8195\"}, {\"status\": \"affected\", \"version\": \"MT8196\"}, {\"status\": \"affected\", \"version\": \"MT8367\"}, {\"status\": \"affected\", \"version\": \"MT8391\"}, {\"status\": \"affected\", \"version\": \"MT8395\"}, {\"status\": \"affected\", \"version\": \"MT8668\"}, {\"status\": \"affected\", \"version\": \"MT8676\"}, {\"status\": \"affected\", \"version\": \"MT8678\"}, {\"status\": \"affected\", \"version\": \"MT8696\"}, {\"status\": \"affected\", \"version\": \"MT8781\"}, {\"status\": \"affected\", \"version\": \"MT8788E\"}, {\"status\": \"affected\", \"version\": \"MT8792\"}, {\"status\": \"affected\", \"version\": \"MT8799\"}, {\"status\": \"affected\", \"version\": \"MT8910\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://www.mediatek.com/product-security-bulletin/September-2026\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In vdec, there is a possible out of bounds write due to a heap buffer overflow. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11262030; Issue ID: MSV-9197.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-122\", \"description\": \"CWE-122 Heap-based Buffer Overflow\"}]}], \"providerMetadata\": {\"orgId\": \"ee979b05-11f8-4f25-a7e0-a1fa9c190374\", \"shortName\": \"MediaTek\", \"dateUpdated\": \"2026-09-07T01:57:15.035Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-20501\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-07T10:40:21.042Z\", \"dateReserved\": \"2025-11-03T01:30:59.028Z\", \"assignerOrgId\": \"ee979b05-11f8-4f25-a7e0-a1fa9c190374\", \"datePublished\": \"2026-09-07T01:57:15.035Z\", \"assignerShortName\": \"MediaTek\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.