Medium [CVE-2026-10536] Use-after-free vulnerability leading to Denial of Service
This medium-severity Red Hat Linux advisory covers CVE-2026-10536 affecting Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat JBoss Core Services.
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Summary
A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and finally terminates the handle with `curl_easy_cleanup()`.
During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation. This can lead to application crashes, resulting in a Denial of Service (DoS).
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.
Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-825.
Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat JBoss Core Services.
Affected products named by the advisory: Red Hat package: curl; Red Hat package: igvm; Red Hat package: snphost.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
- curl-main-8.21.0-0.1.1.hum1
- RHSA-2026:41240
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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