---
id: CVE-2026-109395
title: >-
  Ning compress-lzf before 1.2.0 Out-of-Bounds Memory Access via
  UnsafeChunkDecoder
summary: >-
  Ning compress-lzf before 1.2.0 contains an out-of-bounds memory access
  vulnerability in the sun.misc.Unsafe based UnsafeChunkDecoder that fails to
  validate back-references and literal runs. Attackers can supply crafted LZF
  streams to app…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-125
vendor: ning
product: compress-lzf
affected:
  - compress-lzf < 1.2.0
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T00:46:04.633Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109395'
references:
  - url: 'https://github.com/ning/compress/pull/68'
  - url: >-
      https://github.com/ning/compress/commit/06bdc3744a96b736a7118891f403e44c664f108b
  - url: >-
      https://github.com/ning/compress/blob/compress-lzf-1.1.3/src/main/java/com/ning/compress/lzf/impl/UnsafeChunkDecoder.java#L104
  - url: 'https://github.com/github/securitylab/discussions/970'
  - url: 'https://github.com/ning/compress'
  - url: >-
      https://www.vulncheck.com/advisories/ning-compress-lzf-before-1.2.0-out-of-bounds-memory-access-via-unsafechunkdecoder
    label: >-
      VulnCheck Advisory: Ning compress-lzf before 1.2.0 Out-of-Bounds Memory
      Access via UnsafeChunkDecoder
tags:
  - cve.org
ingestedAt: '2026-10-20T01:49:42.629Z'
---

## Overview

Ning compress-lzf before 1.2.0 contains an out-of-bounds memory access vulnerability in the sun.misc.Unsafe based UnsafeChunkDecoder that fails to validate back-references and literal runs. Attackers can supply crafted LZF streams to applications using the default LZFDecoder to leak unrelated JVM heap memory into decompressed output or crash the JVM.

## Affected

- `compress-lzf < 1.2.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.