CVE-2026-87862— HSTS cache import drops longer-lived child
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.
如果在较长的子域名 HSTS 条目之前导入一个带有 属性的父级 HSTS 条目，该子条目会被静默丢弃。因此，当父级条目过期时，原本有效的子域名 HSTS 策略将随之丢失，导致 curl 发出未加密的 HTTP 请求，而非将其升级为 HTTPS。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-87862
Vulnerability Information
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Vulnerability Title
HSTS cache import drops longer-lived child
Source: CVE Program / CVE List V5
Vulnerability Description
Importing a `includeSubDomains` parent HSTS entry before a longer-lived child
entry, silently drops the child. Consequently, when the parent expires, the
child's valid HSTS policy is lost, causing curl to issue unencrypted HTTP
requests rather than upgrading to HTTPS.
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-2026-87862
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-87862 (2)
Other References for CVE-2026-87862 (1)
Same Patch Batch · curl · 2026-10-20 · 23 CVEs total
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| CVE-2026-86415 | auto client cert connection reuse mixup | |
| CVE-2026-86414 | leaking host credentials to HTTP proxy | |
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| CVE-2026-92387 | never-ending loop via server response omission | |
| CVE-2026-92388 | FTP wildcard write callback mixup | |
| CVE-2026-92386 | server-set cookie aborts cookie jar load | |
| CVE-2026-86409 | stale SigV4 headers sent unintended | |
| CVE-2026-92391 | curl_mime_free stack overflow by recursion | |
| CVE-2026-87865 | knownhost callback mismatches key as missing | |
| CVE-2026-87864 | IMAP APPEND plus CRLF conversion command injection | |
| CVE-2026-87863 | HSTS response erases persisted entries | |
| CVE-2026-87866 | wolfSSL public-key pinning bypass | |
| CVE-2026-87861 | cross-origin reuse of a Negotiate connection | |
| CVE-2026-86411 | FTP connection reuse inherits client-certificate | |
| CVE-2026-86412 | server-set cookie erases cookie jar |
Showing top 20 of 23 CVEs. View all on vendor page → →