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  4. CVE 2026 104721 logback incomplete protection against cve 2026
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-104721

Logback: Incomplete protection against CVE-2026-19880

Answer in brief

CVE-2026-104721 records a Medium severity (CVSS 6.3) vulnerability in Logback: Incomplete protection against CVE-2026-19880. The current sources do not mark it as known exploited. The current feed maps QOS.CH Sarl/Logback-classic (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 2, 2026Updated Oct 2, 2026Source checked Oct 2, 2026First seen by HOL Oct 2, 2026Material review Oct 2, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.3. 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 QOS.CH Sarl/Logback-classic (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
QOS.CH Sarl/Logback-classicgeneric>=0.9.14 <=1.6.4Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for QOS.CH Sarl/Logback-classic.
  2. 2Review the reported fix. Source-reported solution: Update to logack version 1.6.5 or later. This vulnerability requires SiftingAppender to be active as well as unsanitized data provided by an attacker that MDCDiscriminator makes use of.  Sanitizing relevant data provided by the user should fix this vulnerability.

Evidence timeline and material changes

  1. Published upstream

    Oct 2, 2026

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

  2. Source modified

    Oct 2, 2026

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

  3. First seen by HOL

    Oct 2, 2026

Sources and claim methodology

  • Source referencelogback.qos.ch
Upstream source description

Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an MDC-based discriminator value flows unsanitized into a nested FileAppender path, letting an attacker who influences that MDC value (e.g. via an HTTP header) create and append log files outside the intended directory. This issue affects Logback-classic: from 0.9.14 through 1.6.4.  This vulnerability is similar to CVE-2026-19880 but involves other attack techniques.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-22
Source
CVE List V5
Source checked
Oct 2, 2026
References
1 linked source
Open source record