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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.

在 Cyrus IMAP 3.12.4 之前版本中发现一个问题：JMAP 电子邮件标头 Blob ID 可以引用一个越界索引。经过身份验证的用户可以尝试下载一个构造好的、形式为 的 JMAP Blob ID，这可能导致在下载过程中读取超出内部 数组末尾的内存，从而暴露相邻的堆内存。

CVSS 3.1 · Low

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

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 Cyrus IMAP 3.12.4前JMAP Snooze ACL绕过
CVE-2026-61911 4.3 MEDIUM Cyrus IMAP 3.12.4前Sieve邮箱存在性预言
CVE-2026-61915 4.2 MEDIUM Cyrus IMAP 3.12.4前 认证用户致CalDAV进程崩溃
CVE-2026-61910 3.5 LOW Cyrus IMAP 3.12.4前共享邮箱权限控制缺陷
CVE-2026-61909 3.5 LOW Cyrus IMAP 3.12.4前 CalDAV多获取ACL绕过

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-61908

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