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Back to active CVEs
Medium · CVSS 5.3CVE-2026-110926

Openssh: openssh: shared lz77 compression dictionary leaks plaintext across channelsCVE-2026-110926

Answer in brief

CVE-2026-110926 records a Medium severity (CVSS 5.3) vulnerability in Openssh: openssh: shared lz77 compression dictionary leaks plaintext across channels. The current sources do not mark it as known exploited. The current feed maps Red Hat/openshell (generic), Red Hat/openssh (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 15, 2026Updated Oct 15, 2026Source checked Oct 15, 2026First seen by HOL Oct 15, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/openshell (generic), Red Hat/openssh (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/openshellgeneric*Not reported
Red Hat/opensshgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/openshell, Red Hat/openssh.
  2. 2Review the reported fix. Source-reported workaround: Leave Compression disabled. The client default is already off. Prefer application-level compression instead of SSH compression.

Evidence timeline and material changes

  1. Published upstream

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 15, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in OpenSSH. When compression is negotiated, channels on the same connection share one LZ77 dictionary. A peer who can write on one channel can recover plaintext from another channel by chosen-plaintext lengths.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • NULL Pointer Dereference in qsyncsrv.cgiSame generic ecosystem
  • NULL Pointer Dereference in qsyncsrv.cgiSame generic ecosystem
  • Stack-based Buffer Overflow in qsyncsrv.cgiSame generic ecosystem
  • Arbitrary file deletion and remote code executionSame generic ecosystem
  • Remote code execution via command injectionSame generic ecosystem
  • Inadequate Steps to Confirm Vulnerability in QuRouterSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-203
Source
CVE List V5
Source checked
Oct 15, 2026
References
2 linked sources
Open source record