CVE-2026-87864— IMAP APPEND plus CRLF conversion command injection
Quick assessment
Affected
curl curl
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.
启用 会导致 curl 在传输已扩展换行符的数据时，在 字面量中广播原始输入字节数。服务器仅读取 $N$ 个字节作为有效载荷，导致剩余的溢出字节被解析并作为已认证会话中的管道化 IMAP 命令执行。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-87864
Vulnerability Information
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Vulnerability Title
IMAP APPEND plus CRLF conversion command injection
Source: CVE Program / CVE List V5
Vulnerability Description
Enabling `CURLOPT_CRLF` causes curl to advertise the raw input byte count in
the `IMAP APPEND {N}` literal while transmitting line-ending expanded data.
The server reads only $N$ bytes for the payload, causing the remaining
overflow bytes to be interpreted and executed as pipelined IMAP commands
within the authenticated session.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-87864
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-87864 (1)
Other References for CVE-2026-87864 (1)
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