Is CVE-2026-27709 actively exploited?

No active exploitation of CVE-2026-27709 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27709 be exploited remotely?

No. CVE-2026-27709 requires local access to exploit.

What is the CVSS score of CVE-2026-27709?

CVE-2026-27709 has a CVSS score of 6.6 (MEDIUM) and an EPSS exploitation probability of 0.01%.

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MEDIUM

CVE-2026-27709

CWE-125Published: February 26, 2026· Updated: Feb 27, 2026

6.6

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:2.0th

Official Description

NanaZip is an open source file archive. Starting in version 5.0.1252.0 and prior to versions 6.0.1638.0 and 6.5.1638.0, NanaZip’s `.NET Single File Application` parser has an out-of-bounds read vulnerability in manifest parsing. A crafted bundle can provide a malformed `RelativePathLength` so the parser constructs a `std::string` from memory beyond `HeaderBuffer`, leading to crash and potential in-process memory disclosure. Versions 6.0.1638.0 and 6.5.1638.0 fix the issue.

NVD Source

Technical Analysis

CVE-2026-27709 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 6.6.