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CVE-2026-55195

HIGH
8.7
CVSS 4.0
Description
py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, py7zr's Worker.decompress() extracted archive entries without tracking total decompressed size, allowing a crafted .7z file such as a 15.6 KB archive that expands to 100 MB to exhaust disk or memory before extraction completes. This issue is fixed in version 1.1.3.

Metadata

CVE ID
CVE-2026-55195
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-16 15:20 UTC
Published
2026-07-08 20:30 UTC
Last updated
2026-07-08 20:30 UTC
Primary CWE
CWE-409
CWE-409: Improper Handling of Highly Compressed Data (Data A…
Vendor / Product
miurahr / py7zr
Sources
cve.org  ·  NVD

Severity & Metrics

8.7 HIGH CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products (1)
VendorProductPlatformVersions
miurahr py7zr — < 1.1.3
Weakness (CWE)
CWESourceDescription
CWE-409 cna CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.7 HIGH 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References (3)
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