Bug 2543687

Summary:	CVE-2026-84782 arapuca: openssl: Information disclosure via DTLS handshake retransmission [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Marco Benatto <mbenatto>
Component:	arapuca	Assignee:	Sergio Correia <scorreia>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	rawhide	CC:	scorreia
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["57c69a43-7943-4481-9b6e-c53b90f578b4"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-10-13 21:18:49 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:	2537080

Description Marco Benatto 2026-09-29 21:43:08 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.

The DTLS retransmission logic does not correctly handle a handshake message write that is suspended part-way through.
The retransmitted message can be read past the message buffer and the retransmission overwrites the internal state the suspended write needs to resume correctly.

Comment 1 Sergio Correia 2026-10-13 21:18:49 UTC

The openssl crate is an optional dependency gated behind the microvm Cargo feature, which is not enabled in the Fedora build (the spec uses %cargo_build with no --features microvm). The vendored source includes stubs for microvm deps to satisfy Cargo.lock, but they are not compiled or linked.

Even if the microvm feature were enabled, arapuca uses openssl only for HTTPS connections (VM image downloads via reqwest). The DTLS handshake retransmission code path affected by this CVE is never exercised.

Closing as NOTABUG, as it is not affected.