Bug 2543680 - CVE-2026-84782 bcvk: openssl: Information disclosure via DTLS handshake retransmission [fedora-all]
Summary: CVE-2026-84782 bcvk: openssl: Information disclosure via DTLS handshake retra...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: bcvk
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Gursewak Mangat
QA Contact:
URL:
Whiteboard: {"flaws": ["57c69a43-7943-4481-9b6e-c...
Depends On:
Blocks: CVE-2026-84782
TreeView+ depends on / blocked
 
Reported: 2026-09-29 21:42 UTC by Marco Benatto
Modified: 2026-09-29 23:09 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:


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Description Marco Benatto 2026-09-29 21:42:49 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.

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 Gursewak Mangat 2026-09-29 23:09:23 UTC
bcvk is not affected by this. bcvk links against the system OpenSSL library (via reqwest → native-tls → openssl-sys → system libssl), but only uses stream-based TLS for HTTPS connections (container image fetching and registry interactions). The DTLS code path affected by this CVE is not reachable through bcvk:

- No DTLS usage exists anywhere in the codebase
- The Rust native-tls crate does not expose OpenSSL's DTLS APIs
- No UDP/datagram sockets are created — a prerequisite for DTLS
- All network I/O is TCP-based HTTP/1.1 and HTTP/2 via the reqwest HTTP client

bcvk will pick up the fixed OpenSSL automatically when the system package is updated; no rebuild or code change is needed on bcvk's side.


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