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.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Curl Subscribe
Curl Subscribe

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Curl Subscribe
Curl Subscribe
Advisories
Source ID Title
Ubuntu USN Ubuntu USN USN-8927-1 curl vulnerabilities
Ubuntu USN Ubuntu USN USN-8932-1 curl vulnerabilities
Ubuntu USN Ubuntu USN USN-8927-2 curl vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://curl.se/docs/CVE-2026-92391.html cve-icon cve-icon
https://curl.se/docs/CVE-2026-92391.json cve-icon cve-icon
https://hackerone.com/reports/4024222 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-92391 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-92391 cve-icon
History

Tue, 20 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in curl. An attacker could supply deeply nested Multipurpose Internet Mail Extensions (MIME) structures to an application utilizing the libcurl library. During memory cleanup in the curl_mime_free function, excessive recursive calls exhaust available stack memory, leading to an application crash and a Denial of Service (DoS). 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.
Title curl: curl: curl_mime_free stack overflow by recursion curl_mime_free stack overflow by recursion
References

Sun, 18 Oct 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl

Sat, 17 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in curl. An attacker could supply deeply nested Multipurpose Internet Mail Extensions (MIME) structures to an application utilizing the libcurl library. During memory cleanup in the curl_mime_free function, excessive recursive calls exhaust available stack memory, leading to an application crash and a Denial of Service (DoS).
Title curl: curl: curl_mime_free stack overflow by recursion
Weaknesses CWE-674
References
Metrics threat_severity

None

 cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

threat_severity

Low

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published:

Updated: 2026-10-20T20:24:10.745Z

Reserved: 2026-09-16T08:12:51.911Z

Link: CVE-2026-92391

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-20T21:17:21.920

Modified: 2026-10-20T21:17:21.920

Link: CVE-2026-92391

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-14T12:00:00Z

Links: CVE-2026-92391 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-20T22:45:17Z

Weaknesses