M2Team NanaZip up to 5.0.1252.0/6.0.1638.0/6.5.1638.0 NET Single File Application Parser std::string out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability was found in M2Team NanaZip up to 5.0.1252.0/6.0.1638.0/6.5.1638.0. It has been classified as problematic. The impacted element is the function std::string of the component NET Single File Application Parser. The manipulation leads to out-of-bounds. This vulnerability is traded as CVE-2026-27709. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in M2Team NanaZip up to 5.0.1252.0/6.0.1638.0/6.5.1638.0. It has been rated as problematic. This issue affects the function std::string of the component NET Single File Application Parser. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-27709 since 02/23/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 6.0.1638.0 or 6.5.1638.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-8767). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.6
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: NanaZip 6.0.1638.0/6.5.1638.0

Timelineinfo

02/23/2026 CVE reserved
02/26/2026 +3 days Advisory disclosed
02/26/2026 +0 days VulDB entry created
03/01/2026 +3 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-27709 (🔒)
GCVE (CVE): GCVE-0-2026-27709
GCVE (VulDB): GCVE-100-347849
EUVD: 🔒

Entryinfo

Created: 02/26/2026 01:14
Updated: 03/01/2026 10:41
Changes: 02/26/2026 01:14 (68), 02/26/2026 06:07 (1), 03/01/2026 10:41 (12)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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