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CVE-2026-61908

Quick assessment

Affected
cyrusimap Cyrus IMAP
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.

The Cyrus Team Cyrus IMAP是The Cyrus Team组织开源的一款面向企业应用的邮件服务器软件。 The Cyrus Team Cyrus IMAP 3.8.8之前版本、3.9.0至3.10.4之前版本和3.11.0至3.12.4之前版本存在缓冲区错误漏洞，该漏洞源于JMAP email-header blob ID可引用越界索引，经过身份验证的用户可下载形式为H<emailid>-<index>的特制JMAP blob ID，读取内部blob_headers数组末尾之后的内存

CVSS 3.1 · Low EPSS 0.22% · P13

Affected Version Matrix 3

VendorProduct Version RangeStatus
cyrusimap Cyrus IMAP < 3.8.8 affected
3.9.0< 3.10.4 affected
3.11.0< 3.12.4 affected
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I. Basic Information for CVE-2026-61908

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H<emailid>-<index>, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
The Cyrus Team Cyrus IMAP 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
The Cyrus Team Cyrus IMAP是The Cyrus Team组织开源的一款面向企业应用的邮件服务器软件。 The Cyrus Team Cyrus IMAP 3.8.8之前版本、3.9.0至3.10.4之前版本和3.11.0至3.12.4之前版本存在缓冲区错误漏洞，该漏洞源于JMAP email-header blob ID可引用越界索引，经过身份验证的用户可下载形式为H<emailid>-<index>的特制JMAP blob ID，读取内部blob_headers数组末尾之后的内存
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
cyrusimap Cyrus IMAP 0 ~ 3.8.8 -

II. Public POCs for CVE-2026-61908

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III. Intelligence Information for CVE-2026-61908

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Vendor Pages for CVE-2026-61908 (4)

Same Patch Batch · cyrusimap · 2026-09-09 · 6 CVEs total

CVE-2026-61907 4.3 MEDIUM The Cyrus Team Cyrus IMAP 授权问题漏洞
CVE-2026-61911 4.3 MEDIUM The Cyrus Team Cyrus IMAP 信息泄露漏洞
CVE-2026-61915 4.2 MEDIUM The Cyrus Team Cyrus IMAP 资源管理错误漏洞
CVE-2026-61910 3.5 LOW The Cyrus Team Cyrus IMAP 授权问题漏洞
CVE-2026-61909 3.5 LOW The Cyrus Team Cyrus IMAP 授权问题漏洞

IV. Related Vulnerabilities

Same product: Cyrus IMAP
Same vendor: cyrusimap
Same weakness: CWE-125