CVE-2018-5996

Severity: high (CVSS 7.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-01-31 · updated 2026-06-17
Weakness: CWE-119

Description

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.

Affected products

7-Zip: before 18.00 — fixed in 18.00
7-Zip P7Zip: before 18.0 — fixed in 18.0
Debian Linux: 7.0, 8.0, 9.0

How to fix

Upgrade to a fixed version: 7-Zip 18.00; 7-Zip P7Zip 18.0. Check the vendor advisory for mitigations.

References

http://www.securitytracker.com/id/1040831
https://0patch.blogspot.si/2018/02/two-interesting-micropatches-for-7-zip.html
https://github.com/p7zip-project/p7zip/issues/32
https://github.com/p7zip-project/p7zip/issues/8
https://landave.io/2018/01/7-zip-multiple-memory-corruptions-via-rar-and-zip/
http://www.securitytracker.com/id/1040831
https://0patch.blogspot.si/2018/02/two-interesting-micropatches-for-7-zip.html
https://landave.io/2018/01/7-zip-multiple-memory-corruptions-via-rar-and-zip/

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