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 Enterprise Linux 10, Red Hat JBoss Core Services 2.4.62.SP5, Red Hat Cost Management On-Premise 1.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
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 Enterprise Linux 10; Red Hat JBoss Core Services 2.4.62.SP5; Red Hat Cost Management On-Premise 1; Red Hat Hardened Images; Red Hat JBoss Core Services.
Affected products named by the advisory: Red Hat package: curl; Red Hat package: igvm; Red Hat package: snphost.
Is CVE-2026-10536 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-10536 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-10536?
Upgrade to a fixed release named by Red Hat:
- curl-0:8.12.1-4.el10_2.7
- libcurl-1.dll
- costmanagement/costmanagement-ui-rhel10:1792605272
- curl-main-8.21.0-0.1.1.hum1
- RHSA-2026:80512
- RHSA-2026:56869
- RHSA-2026:87400
- RHSA-2026:41240
Confirm against the vendor advisory before you patch.
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 13 days ago·verify at source
- curl-0:8.12.1-4.el10_2.7
- libcurl-1.dll
- costmanagement/costmanagement-ui-rhel10:1792605272
- curl-main-8.21.0-0.1.1.hum1
- RHSA-2026:80512
- RHSA-2026:56869
- RHSA-2026:87400
- RHSA-2026:41240
Official advisory · high-confidence parse· fetched 13 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 13 days ago·verify at source
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