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Back to active CVEs
High · CVSS 8.3CVE-2026-66086

Stack-based Buffer Overflow in ModemCVE-2026-66086

Answer in brief

CVE-2026-66086 records a High severity (CVSS 8.3) vulnerability in Stack-based Buffer Overflow in Modem. The current sources do not mark it as known exploited. The current feed maps Unisoc (Shanghai) Technologies Co., Ltd./Modem (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 12, 2026Updated Oct 12, 2026Source checked Oct 12, 2026First seen by HOL Oct 12, 2026Material review Oct 12, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 8.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unisoc (Shanghai) Technologies Co., Ltd./Modem (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Unisoc (Shanghai) Technologies Co., Ltd./ModemgenericT8100 || T9100 || UDX710Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Unisoc (Shanghai) Technologies Co., Ltd./Modem.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 12, 2026

Sources and claim methodology

  • Source referenceunisoc.com
Upstream source description

In the modem OTA stack, there is a possible stack-based buffer overflow due to improper validation of scheduling information in SIB1 messages. This could lead to remote code execution or denial of service with no additional execution privileges needed.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Information Disclosure in ModemSame unisoc (shanghai) technologies co., ltd./modem package
  • Channel tokens and organization API key exposed in API responsesSame generic ecosystem
  • erzhongxmu Jeewms Autocomplete Data JeecgFormDemoController.java getTreeData sql injectionSame generic ecosystem
  • zhayujie CowAgent Streaming Tool-Call Argument json.loads allocation of resourcesSame generic ecosystem
  • zhayujie CowAgent Markdown Rendering Markdown.tsx denial of serviceSame generic ecosystem
  • Appwrite Browser Screenshot Service Get.php PublicHostname server-side request forgerySame generic ecosystem

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-121
Source
CVE List V5
Source checked
Oct 12, 2026
References
1 linked source
Open source record