Bug 2507893

Summary: CVE-2026-10536 rustup: libcurl: Use-after-free vulnerability leading to Denial of Service [fedora-all]
Product: [Fedora] Fedora Reporter: Srikanth Balasubramanian <sbalasub>
Component: rustupAssignee: Rust SIG <rust-sig>
Status: CLOSED CANTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: decathorpe, rust-sig, suraj.ghimire7
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["4d7b0ee2-22af-4746-a28b-135606216331"]}
Fixed In Version: Doc Type: ---
Doc Text:
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Clone Of: Environment:
Last Closed: 2026-07-28 10:44:36 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2173769, 2496766    

Description Srikanth Balasubramanian 2026-07-28 07:20:49 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.
Comment 1 Fabio Valentini 2026-07-28 10:44:36 UTC 
rustup only dynamically links to libcurl, so this issue needs to be addressed in the curl package itself.