CVE-2026-109395CWE-125

CVE-2026-109395

Critical · published October 20, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
33.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS v4.0
8.8 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00403 · 33.4th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-10-20T05:17Z
References (6)
https://github.com/github/securitylab/discussions/970 · [email protected]https://github.com/ning/compress · [email protected]https://github.com/ning/compress/blob/compress-lzf-1.1.3/src/main/java/com/ning/compress/lzf/impl/UnsafeChunkDecoder.java#L104 · [email protected]https://github.com/ning/compress/commit/06bdc3744a96b736a7118891f403e44c664f108b · [email protected]https://github.com/ning/compress/pull/68 · [email protected]https://www.vulncheck.com/advisories/ning-compress-lzf-before-1.2.0-out-of-bounds-memory-access-via-unsafechunkdecoder · [email protected]
EPSS history
Timeline
  • 21 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 20 OCT 00:46Z
    Ning compress-lzf before 1.2.0 Out-of-Bounds Memory Access via UnsafeChunkDecoder
    cvelistv5
  • 20 OCT 00:46Z
    Ning compress-lzf before 1.2.0 Out-of-Bounds Memory Access via UnsafeChunkDecoder
    cvelistv5