What is the CVSS score of CVE-2026-27710?

CVE-2026-27710 has a CVSS 3.1 base score of 5.0 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of .NET are affected by CVE-2026-27710?

Organizations using version 5.0.1252.0 and should be aware of moderate risk from CVE-2026-27710 rated CVSS 5.0. Exploitation could compromise the security of affected deployments.

Is there a public PoC exploit available for CVE-2026-27710?

Yes, a public proof-of-concept exploit is available for CVE-2026-27710. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-27710?

Within 30 days: Identify affected systems running version 5.0.1252.0 and and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

.NET CVE-2026-27710

MEDIUM

Integer Underflow (CWE-191)

2026-02-26 security-advisories@github.com

.NET Integer Overflow Nanazip

5.0

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.0 MEDIUM

AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 27, 2026 - 17:53 vuln.today

Public exploit code

CVE Published

Feb 26, 2026 - 00:16 nvd

MEDIUM 5.0

DescriptionGitHub Advisory

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, a denial-of-service vulnerability exists in NanaZip’s .NET Single File Application parser. A crafted bundle can force an integer underflow in header-size calculation and trigger an unbounded memory allocation attempt during archive open. Versions 6.0.1638.0 and 6.5.1638.0 fix the issue.

AnalysisAI

NanaZip versions 5.0.1252.0 through 6.5.1637.x contain an integer underflow in the .NET Single File Application parser that allows local attackers with user privileges to cause denial of service through unbounded memory allocation when opening a specially crafted archive file. Public exploit code exists for this vulnerability. Patches are available in versions 6.0.1638.0 and 6.5.1638.0.

Technical ContextAI

Classified as CWE-191 (Integer Underflow). Affects Nanazip. 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, a denial-of-service vulnerability exists in NanaZip’s .NET Single File Application parser. A crafted bundle can force an integer underflow in header-size calculation and trigger an unbounded memory allocation attempt during archive open. Versions 6.0.1638.0 and 6.5.1638.0 fix the issue.