MediaTek MT8791 Telephony heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00-

Summaryinfo

A vulnerability classified as critical was found in MediaTek MT6739, MT6761, MT6765, MT6768, MT6781, MT6789, MT6833, MT6853, MT6855, MT6877, MT6883, MT6885, MT6889, MT6893, MT8695, MT8696, MT8765, MT8766, MT8766R, MT8768, MT8781 and MT8791. This vulnerability affects unknown code of the component Telephony. Executing a manipulation can lead to heap-based overflow. The identification of this vulnerability is CVE-2026-20462. The attack can only be executed locally. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability classified as critical was found in MediaTek MT6739, MT6761, MT6765, MT6768, MT6781, MT6789, MT6833, MT6853, MT6855, MT6877, MT6883, MT6885, MT6889, MT6893, MT8695, MT8696, MT8765, MT8766, MT8766R, MT8768, MT8781 and MT8791. This vulnerability affects an unknown function of the component Telephony. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In Telephony, there is a possible memory corruption due to a heap buffer overflow. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11006447; Issue ID: MSV-7871.

The advisory is shared for download at corp.mediatek.com. This vulnerability was named CVE-2026-20462 since 11/03/2025. The exploitation appears to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available.

Applying the patch ALPS11006447 is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: ALPS11006447

Timelineinfo

11/03/2025 CVE reserved
07/01/2026 +239 days Advisory disclosed
07/01/2026 +0 days VulDB entry created
07/01/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: MSV-7871
Status: Confirmed

CVE: CVE-2026-20462 (🔒)
GCVE (CVE): GCVE-0-2026-20462
GCVE (VulDB): GCVE-100-375004

Entryinfo

Created: 07/01/2026 07:15
Changes: 07/01/2026 07:15 (56)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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