Is CVE-2026-55206 actively exploited?

No active exploitation of CVE-2026-55206 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55206 be exploited remotely?

Yes. CVE-2026-55206 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-55206?

CVE-2026-55206 has a CVSS score of 8.7 (HIGH).

HOME VULNERABILITIESCVE-2026-55206

HIGH

CVE-2026-55206

CWE-407Published: July 8, 2026· Updated: Jul 10, 2026

8.7

CVSS v3.1

EPSS:0.32%probability of exploitation in 30 daysPercentile:24.0th

Official Description

py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, PackInfo._read() in archiveinfo.py used an O(n^2) cumulative sum pattern for attacker-controlled numstreams values parsed from archive headers, allowing a crafted .7z archive to cause excessive CPU consumption during SevenZipFile.init() before extraction. This issue is fixed in version 1.1.3.

NVD Source

Technical Analysis

CVE-2026-55206 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X