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CVE-2026-86776— KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size

Quick assessment

Affected
KeePass KeePass
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.

KeePass 2.35 至 2.61.1 版本在 函数中，在分配内存之前未验证 KDBX 文件头部的字段大小。攻击者可以构造一个恶意的 KDBX 文件，其中声明了过长的头部字段长度，从而触发数 GB 的内存分配，导致应用程序资源耗尽并终止运行。

CVSS 3.3 · Low

Possible ATT&CK Techniques 1 AI

T1027.001 · Binary Padding
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I. Basic Information for CVE-2026-86776

Vulnerability Information
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Vulnerability Title
KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size
Source: CVE Program / CVE List V5
Vulnerability Description
KeePass versions 2.35 through 2.61.1 fail to validate KDBX header field sizes before memory allocation in the ReadHeaderField function. Attackers can craft a malicious KDBX file declaring excessive header field lengths to trigger allocation of gigabytes of memory, causing the application to consume resources and terminate.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
KeePass KeePass 2.35 ~ 2.61.1 -

II. Public POCs for CVE-2026-86776

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III. Intelligence Information for CVE-2026-86776

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Vendor Advisories for CVE-2026-86776 (1)

Proof of Concept for CVE-2026-86776 (1)

Vendor Pages for CVE-2026-86776 (1)

IV. Related Vulnerabilities

Same product: KeePass
Same vendor: KeePass
Same weakness: CWE-789

V. Comments for CVE-2026-86776

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