CVE-2026-92391
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).
Statement
This vulnerability is rated as Low severity because triggering the crash requires an application to construct thousands of nested MIME structures via libcurl's API, an atypical pattern not encountered in normal deployments. Furthermore, the curl command-line utility is not affected, restricting the blast radius strictly to custom or third-party applications invoking these specific functions. The resulting stack exhaustion leads only to a denial of service through process termination without compromising confidentiality or integrity.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.7 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | High | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | Low | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Acknowledgements
Red Hat would like to thank Joshua Rogers (Aisle Research) for reporting this issue.
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