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CVE-2026-118673— KeePassXC: Out-of-bounds write in browser integration response encryption with oversized database responses

Quick assessment

Affected
keepassxreboot keepassxc
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.

KeePassXC 是一个跨平台的社区驱动项目，移植自 Windows 应用 KeePass Password Safe。在 2.3.0 至 2.8.0 版本期间，KeePassXC 的浏览器集成功能在 中使用固定的 1 MiB 输出向量来加密已授权响应；然而， 函数实际写入的数据长度为明文长度加上 。若存在一个能够访问每用户 IPC 端点的浏览器协议客户端，且该客户端具备有效的数据库关联，并能促使已解锁的数据库生成并加密足够大的已授权响应，则可能在任何响应被发送之前触发一次越界顺序写入漏洞。该问题已在 2.8.0

CVSS 4.1 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
keepassxreboot keepassxc >= 2.3.0, < 2.8.0 affected
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I. Basic Information for CVE-2026-118673

Vulnerability Information
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Vulnerability Title
KeePassXC: Out-of-bounds write in browser integration response encryption with oversized database responses
Source: CVE Program / CVE List V5
Vulnerability Description
KeePassXC is a cross-platform community-driven port of the Windows application KeePass Password Safe. From 2.3.0 until 2.8.0, KeePassXC browser integration encrypts authorized responses in src/browser/BrowserMessageBuilder.cpp using a fixed 1 MiB output vector even though Botan::Sodium::crypto_box_easy() writes the plaintext length plus crypto_box_MACBYTES. A browser-protocol client that can access the per-user IPC endpoint, has a valid database association, and causes an unlocked database to generate and encrypt a sufficiently large authorized response can trigger a sequential out-of-bounds write before any response is delivered. This issue is fixed in version 2.8.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
keepassxreboot keepassxc >= 2.3.0, < 2.8.0 -

II. Public POCs for CVE-2026-118673

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III. Intelligence Information for CVE-2026-118673

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Other References for CVE-2026-118673 (4)

IV. Related Vulnerabilities

Same product: keepassxc
Same vendor: keepassxreboot
Same weakness: CWE-787