Bug 2535961

Summary:	CVE-2026-18924 rust: libcurl: Use-after-free in HTTP/2 Server Push with shared connections [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Srikanth Balasubramanian <sbalasub>
Component:	rust	Assignee:	Rust SIG <rust-sig>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	low
Version:	rawhide	CC:	amulhern, igor.raits, jchecahi, jistone, paumurph, rust-sig
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["818301b1-cabf-47db-a0d3-19ed3eb06d9a"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-09-17 16:32:02 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:	2529201

Description Srikanth Balasubramanian 2026-09-17 11:39:45 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 flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent
handle is set to share connections with other handles, can lead to
use-after-free in the cleanup process.

Comment 1 Josh Stone 2026-09-17 16:32:02 UTC

The bundled `curl` sources (via the Rust `curl-sys` crate) are wholly removed during the `%prep` phase to be sure we don't use them. Instead, we use the system `curl` library, so any CVE fixes only need to be made in that component on its own.