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CVE-2026-92391— curl_mime_free stack overflow by recursion

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.

通过公共 API 构建的深层嵌套多部分 MIME 结构，会在 libcurl 执行常规清理操作时引发栈溢出。 函数中过度的递归深度导致在遍历结构时无限制地分配栈帧，最终造成宿主进程崩溃。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.36% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 78

VendorProduct Version RangeStatus
curl curl 8.22.0≤ 8.22.0 affected
8.21.0≤ 8.21.0 affected
8.20.0≤ 8.20.0 affected
8.19.0≤ 8.19.0 affected
8.18.0≤ 8.18.0 affected
8.17.0≤ 8.17.0 affected
8.16.0≤ 8.16.0 affected
8.15.0≤ 8.15.0 affected
… +70 more rows
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I. Basic Information for CVE-2026-92391

Vulnerability Information
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Vulnerability Title
curl_mime_free stack overflow by recursion
Source: CVE Program / CVE List V5
Vulnerability Description
A deeply nested multipart MIME structure constructed via the public API causes a stack overflow in libcurl during normal cleanup operations. An excessive recursion depth within `curl_mime_free` leads to unbounded stack frame allocation during structure traversal, ultimately crashing the host process.
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

Vendor Product Affected Versions CPE Subscribe
curl curl 8.22.0 ~ 8.22.0 -

II. Public POCs for CVE-2026-92391

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III. Intelligence Information for CVE-2026-92391

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Vendor Advisories for CVE-2026-92391 (2)

Other References for CVE-2026-92391 (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
CVE-2026-92390 -J no-clobber guarantee bypassed with 103 early hints
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-2026-87865 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-2026-87862 HSTS cache import drops longer-lived child
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 → →

IV. Related Vulnerabilities

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Same vendor: curl