CVE-2026-92391

curl_mime_free stack overflow by recursion

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Published Oct 20, 2026 CVSS 3.1 · 7.5 High EPSS 1.2% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

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
Type Values Removed Values Added
Metrics 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'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}
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
Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl
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
Weaknesses

Sources

Status
PUBLISHED
Assigner
curl
Published
Updated
Oct 30, 2026, 4:16 PM
Reserved
Sep 16, 2026, 8:12 AM

View source JSON

Updated
Oct 30, 2026, 4:15 PM

JSON

Status
Awaiting Analysis
Published
Oct 20, 2026, 9:17 PM
Modified
Oct 30, 2026, 5:17 PM

View source JSON

Severity
Low
Public date
Oct 14, 2026, 12:00 PM

View source Bugzilla JSON

Updated
Oct 30, 2026, 8:15 PM

JSON