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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是KeePass团队开源的一款离线加密存储账号密码的密码管理软件。 KeePass 2.35版本至2.61.1版本存在资源管理错误漏洞，该漏洞源于ReadHeaderField函数在内存分配前未验证KDBX标头字段大小，攻击者可构造声明过长标头字段的恶意KDBX文件，导致分配数GB内存、应用程序资源耗尽并终止。

CVSS 3.3 · Low EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1027.001 · Binary Padding

Affected Version Matrix 1

VendorProduct Version RangeStatus
KeePass KeePass 2.35≤ 2.61.1 affected
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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
Vulnerability Title
KeePass 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
KeePass是KeePass团队开源的一款离线加密存储账号密码的密码管理软件。 KeePass 2.35版本至2.61.1版本存在资源管理错误漏洞，该漏洞源于ReadHeaderField函数在内存分配前未验证KDBX标头字段大小，攻击者可构造声明过长标头字段的恶意KDBX文件，导致分配数GB内存、应用程序资源耗尽并终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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