CVE-2026-10536
Description
A flaw was found in libcurl. This use-after-free vulnerability occurs when an application configures an HTTP/2 stream-dependency tree and then performs a sequence of operations involving curl_easy_reset() and curl_easy_cleanup(). During the final cleanup, libcurl attempts to access memory that has already been released. This can lead to application crashes, resulting in a Denial of Service (DoS).
Statement
This Moderate impact use-after-free flaw in libcurl can lead to application crashes and Denial of Service. It occurs when an application specifically configures an HTTP/2 stream-dependency tree and then performs a precise sequence of curl_easy_reset() and curl_easy_cleanup() operations, attempting to access already freed memory. This vulnerability requires a specific application programming pattern, limiting its exploitability in typical Red Hat deployments.
Mitigation
To mitigate this issue, avoid configuring HTTP/2 stream dependencies within applications utilizing libcurl. This functionality is considered deprecated and its use is required to trigger the vulnerability.
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 | 4.7 | N/A | 9.8 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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