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CVE-2026-86289— Ollama GGUF Decoder gguf.go readGGUFV1String integer overflow

Quick assessment

Affected
n/a Ollama
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Ollama 版本 0.31.1 及更早版本中发现了一个安全漏洞。该问题影响了 GGUF 解码器组件中 文件里的 函数。通过对相关数据进行操作，会导致整数溢出漏洞。该漏洞可被远程利用。利用该漏洞的代码（exploit）已被公开，因此该漏洞可能被实际利用。将版本升级到 0.31.2-rc1 可以解决此问题。该修复补丁的标识为 。建议用户升级受影响的组件至修复版本。

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-86289

Vulnerability Information
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Vulnerability Title
Ollama GGUF Decoder gguf.go readGGUFV1String integer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in Ollama up to 0.31.1. This issue affects the function readGGUFV1String of the file fs/ggml/gguf.go of the component GGUF Decoder. Performing a manipulation results in integer overflow. The attack is possible to be carried out remotely. The exploit has been made public and could be used. Upgrading to version 0.31.2-rc1 is capable of addressing this issue. The patch is named 67b6a1c2d45321e0cb3c04a18073f9818de7724b. It is recommended to upgrade the affected component.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- Ollama 0.31.0 cpe:2.3:a:ollama:ollama:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-86289

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III. Intelligence Information for CVE-2026-86289

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Other References for CVE-2026-86289 (1)

Other References for CVE-2026-86289 (7)

Same Patch Batch · n/a · 2026-09-07 · 4 CVEs total

CVE-2026-86271 4.7 MEDIUM FluentCMS PermissionManager.cs GetAccessible authorization
CVE-2026-86285 4.3 MEDIUM BookStack Attachment Edit Endpoint AttachmentController.php getUpdateForm access control
CVE-2026-86244 4.3 MEDIUM FastAdmin User Controller User.php login cross site scripting

IV. Related Vulnerabilities

Same product: Ollama
Same vendor: n/a
Same weakness: CWE-190

V. Comments for CVE-2026-86289

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