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Maven

CVE-2023-6378

HIGH

CVE-2023-6378 is a high-severity (CVSS 7.1) Deserialization of Untrusted Data vulnerability in ch.qos.logback:logback-classic. O3 Security confirms whether CVE-2023-6378 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Logback "receiver" DOS vulnerability

Also known asGHSA-vmq6-5m68-f53m
Published
Nov 29, 2023
Updated
Jul 15, 2026
Affected
6 pkgs
Patched
6 / 6
Exploits
None indexed

Blast Radius

6 pkgs affected
ch.qos.logback:logback-classicch.qos.logback:logback-classicch.qos.logback:logback-corech.qos.logback:logback-corech.qos.logback:logback-corech.qos.logback:logback-classic

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

A serialization vulnerability in logback receiver component part of logback version 1.4.11 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

Affected Packages

6 total 6 fixed
EcosystemPackageVulnerable rangeFix
Mavench.qos.logback:logback-classic1.3.0&&< 1.3.121.3.12
Mavench.qos.logback:logback-classic1.4.0&&< 1.4.121.4.12
Mavench.qos.logback:logback-core1.3.0&&< 1.3.121.3.12
Mavench.qos.logback:logback-core1.4.0&&< 1.4.121.4.12
Mavench.qos.logback:logback-coreall versions1.2.13
Mavench.qos.logback:logback-classicall versions1.2.13

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ch.qos.logback:logback-classic. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update ch.qos.logback:logback-classic to 1.3.12 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-6378 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2023-6378 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2023-6378. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

A serialization vulnerability in logback receiver component part of logback version 1.4.11 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.
O3 Security · Impact-Aware SCA

Is CVE-2023-6378 in your dependencies?

O3 detects CVE-2023-6378 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.