CVE-2026-106582
published 2026-10-06CVE-2026-106582: In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "Crossing the Streams"…
PriorityP415low3.7CVSS 3.1
AVNACHPRNUINSUCLINAN
EPSS
0.18%
7.4th percentile
In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "Crossing the Streams" findings.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| openbsd | openssh | < 10.6 | 10.6 |
| openbsd | openssh | — | — |
| openshift | ose-rhel-coreos-8 | — | — |
| openshift | ose-rhel-coreos-9 | — | — |
| ubuntu | openssh | — | — |
| ubuntu | openssh-gssapi | — | — |
CVSS provenance
nvdv3.13.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
vendor_ubuntu6.5MEDIUM
vendor_redhat3.7LOW
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Ubuntu
OpenSSH vulnerabilities
vendor_ubuntu·2026-10-19·CVSS 6.5
CVE-2026-106553 [MEDIUM] OpenSSH vulnerabilities
Title: OpenSSH vulnerabilities
Summary: Several security issues were fixed in OpenSSH.
It was discovered that OpenSSH's sftp client incorrectly handled paths
returned by the server during a recursive copy operation. A remote attacker
controlling the server could possibly use this issue to write files to
unintended locations. (CVE-2026-106552)
It was discovered that OpenSSH's sshd server incorrectly handled
GSSAPIAuthentication state across authentication attempts. An attacker
could possibly use this issue to obtain credentials from a previous failed
authentication attempt. (CVE-2026-106553, CVE-2026-106555)
It was discovered that OpenSSH incorrectly used an LZ77 dictionary coder
during compression. An attacker could possibly use this issue to obtain
sensitive information. (CVE-2026-106
Ubuntu
OpenSSH vulnerabilities
vendor_ubuntu·2026-10-14·CVSS 6.5
CVE-2026-106552 [MEDIUM] OpenSSH vulnerabilities
Title: OpenSSH vulnerabilities
Summary: Several security issues were fixed in OpenSSH.
It was discovered that OpenSSH's sftp client incorrectly handled paths
returned by the server during a recursive copy operation. A remote
attacker controlling the server could possibly use this issue to write
files to unintended locations. (CVE-2026-106552)
It was discovered that OpenSSH's sshd server incorrectly handled
GSSAPIAuthentication state across authentication attempts. An attacker
could possibly use this issue to obtain credentials from a previous
failed authentication attempt. (CVE-2026-106553, CVE-2026-106555)
It was discovered that OpenSSH incorrectly used an LZ77 dictionary coder
during compression. An attacker could possibly use this issue to obtain
sensitive information. (CVE-2026-106
Red Hat
openssh: openssh: Information disclosure via shared compression side-channel
vendor_redhat·2026-10-06·CVSS 3.7
CVE-2026-106582 [LOW] CWE-205 openssh: openssh: Information disclosure via shared compression side-channel
openssh: openssh: Information disclosure via shared compression side-channel
In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "Crossing the Streams" findings.
A flaw was found in OpenSSH. When session compression is enabled, an attacker with access to a shared Secure Shell (SSH) connection can exploit the compression state shared across multiplexed channels. By analyzing changes in transmitted packet lengths caused by repeated data patterns, the attacker may deduce and recover sensitive plaintext information transmitted over concurrent channels in the same session.
Statement: A low severity information disclosure flaw was found in OpenSSH as included in Red Hat Hardened Images, where the openssh comp
GHSA
In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "Crossing the Streams" findings.
ghsa_unreviewed·2026-10-06
CVE-2026-106582 [LOW] CWE-514 In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "Crossing the Streams" findings.
In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "Crossing the Streams" findings.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-106582 openssh: openssh: Information disclosure via shared compression side-channel [fedora-all]
bugzilla·2026-10-19·CVSS 3.7
CVE-2026-106582 [LOW] CVE-2026-106582 openssh: openssh: Information disclosure via shared compression side-channel [fedora-all]
CVE-2026-106582 openssh: openssh: Information disclosure via shared compression side-channel [fedora-all]
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.
In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "Crossing the Streams" findings.
Discussion:
*** Bug 2553376 has been marked as a duplicate of this bug. ***
Bugzilla
CVE-2026-106582 openssh: openssh: Information disclosure via shared compression side-channel
bugzilla·2026-10-06·CVSS 3.7
CVE-2026-106582 [LOW] CVE-2026-106582 openssh: openssh: Information disclosure via shared compression side-channel
CVE-2026-106582 openssh: openssh: Information disclosure via shared compression side-channel
In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "Crossing the Streams" findings.
2026-10-06
Published