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.
Published: 2026-10-20
Score: 3.7 Low
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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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
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

Subscriptions

Curl Curl
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