Bug 2530633 - CVE-2026-56855 opkssh: golang.org/x/crypto/ssh: Denial of Service via crafted messages [fedora-all]
Summary: CVE-2026-56855 opkssh: golang.org/x/crypto/ssh: Denial of Service via crafted...
Keywords:
Status: ON_QA
Alias: None
Product: Fedora
Classification: Fedora
Component: opkssh
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Till Hofmann
QA Contact:
URL:
Whiteboard: {"flaws": ["6149aca5-d0d4-472f-b5bb-7...
Depends On:
Blocks: CVE-2026-56855
TreeView+ depends on / blocked
 
Reported: 2026-09-09 09:44 UTC by jkelly
Modified: 2026-09-13 19:13 UTC (History)
2 users (show)

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


Attachments (Terms of Use)

Description jkelly 2026-09-09 09:44:40 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.

Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.

Comment 1 Fedora Update System 2026-09-12 08:52:30 UTC
FEDORA-2026-38b019a0f0 (opkssh-0.16.0-3.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-38b019a0f0

Comment 2 Fedora Update System 2026-09-12 08:52:40 UTC
FEDORA-2026-f7b73f165d (opkssh-0.16.0-3.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-f7b73f165d

Comment 3 Fedora Update System 2026-09-12 08:52:45 UTC
FEDORA-2026-559bbb39f5 (opkssh-0.16.0-3.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-559bbb39f5

Comment 4 Fedora Update System 2026-09-13 18:30:46 UTC
FEDORA-2026-f7b73f165d has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-f7b73f165d`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-f7b73f165d

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-09-13 18:46:23 UTC
FEDORA-2026-559bbb39f5 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-559bbb39f5`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-559bbb39f5

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-09-13 19:13:27 UTC
FEDORA-2026-38b019a0f0 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-38b019a0f0`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-38b019a0f0

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.


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