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CVE-2026-61915

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 之前的版本中发现了一个问题：存在 VPATCH BYPARAM 双重释放（double-free）漏洞。一个经过身份验证的日历用户可以利用该漏洞，通过向拥有两个或更多匹配类型属性的资源发送包含 PATCH-ACTION="BYPARAM@..." 的 PATCH 请求，导致 Cyrus CalDAV 工作进程崩溃。用于存储选择符（selector）的内存会在遍历这些属性的每次迭代中被释放一次，从而引发双重释放。

CVSS 4.2 · Medium
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I. Basic Information for CVE-2026-61915

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. There is a VPATCH BYPARAM double-free. An authenticated calendar user could crash a Cyrus CalDAV worker with a PATCH containing PATCH-ACTION="BYPARAM@..." against a resource with two or more properties of the matched kind. The memory holding the selector would be freed once on each iteration over the properties.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
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-2026-61915

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III. Intelligence Information for CVE-2026-61915

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Vendor Pages for CVE-2026-61915 (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-2026-61910 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
CVE-2026-61908 3.1 LOW Cyrus IMAP<3.12.4 JMAP越界读堆内存

IV. Related Vulnerabilities

Same product: Cyrus IMAP
Same vendor: cyrusimap
Same weakness: CWE-415

V. Comments for CVE-2026-61915

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