3.7

CVE-2026-106582: openbsd openssh Covert Channel

CVSS: 3.7v3.1LowAnalyzed
AliasesUBUNTU-CVE-2026-106582DEBIAN-CVE-2026-106582
Published 06-10-2026Last modified 07-10-2026
Open JSON

Vulnerability summary

CVE-2026-106582 is a low (CVSS 3.7) Covert Channel vulnerability in openbsd openssh. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.3% of scored vulnerabilities.

Overall risk
15/100
0100
Low · default modelHow is this calculated?
CVSS score
3.7/10
010
Low · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 2
CVE-2026-106586MGASA-2026-0521USN-8928-1USN-8937-1

Timeline

  1. 06-10-2026
    PublishedVulnerability first disclosed.
  2. 07-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

07-10-202620-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu3 products
  • opensshAll versions (No fix recorded) | < 1:8.9p1-3ubuntu0.18 | < 1:9.6p1-3ubuntu13.20 | < 1:10.5p1-1ubuntu3.1 | < 1:10.2p1-2ubuntu3.8
  • openssh-gssapiAll versions (No fix recorded) | < 1:10.5p1-1ubuntu3.1
  • openssh-ssh1All versions (No fix recorded)
Debian2 products
  • opensshAll versions (No fix recorded) | < 1:10.6p1-1
  • openssh-gssapiAll versions (No fix recorded) | < 1:10.6p1-1
Openbsd1 product

3 vendors · 6 products

References

7 links