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Fencer Vulns
high 7.8

CVE-2018-5996 json

Insufficient exception handling in the method NCompress::NRar3::CDecoder::Code of 7-Zip before 18.00 and p7zip can lead to multiple memory…

published 2018-01-31 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17761

cvss
7.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.9%
EPSS 2.9% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

Insufficient exception handling in the method NCompress::NRar3::CDecoder::Code of 7-Zip before 18.00 and p7zip can lead to multiple memory corruptions within the PPMd code, allows remote attackers to cause a denial of service (segmentation fault) or execute arbitrary code via a crafted RAR archive.

Patch / fix

  • 7-zip 7-zip 18.00
  • 7-zip p7zip 18.0
  • p7zip-rar Debian 13, Debian 12 16.02-2

debian advisories DEBIAN-CVE-2018-5996

  • p7zip SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +4 more 9.20.1-7.3.1

suse advisories SUSE-SU-2018:0464-1

  • p7zip Alpine 3.17, Alpine 3.16, Alpine 3.15 +10 more 16.02-r3

alpine advisories ALPINE-CVE-2018-5996

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • p7zip Azure Linux 3.0 16.02-23
  • p7zip CBL-Mariner 2.0 16.02-22

azure linux advisories AZL-35093AZL-6784

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-5996 updated cvss 9.8

p7zip: memory corruption in RAR decompression

  • Red Hat Enterprise Linux 8 p7zip
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.85% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • landave.io https://landave.io/2018/01/7-zip-multiple-memory-corruptions-via-rar-and-zip/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.