What is the CVSS score of CVE-2026-26282?

CVE-2026-26282 has a CVSS 3.1 base score of 6.6 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of .NET are affected by CVE-2026-26282?

Organizations using version 5.0.1252.0 and should be aware of notable risk from CVE-2026-26282 rated CVSS 6.6. Exploitation could compromise the security of affected deployments.

Is there a public PoC exploit available for CVE-2026-26282?

Yes, a public proof-of-concept exploit is available for CVE-2026-26282. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-26282?

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-2026-26282

MEDIUM

Buffer Over-read (CWE-126)

2026-02-19 security-advisories@github.com

.NET Denial Of Service Nanazip

6.6

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.6 MEDIUM

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:03 vuln.today

PoC Detected

Feb 20, 2026 - 19:42 vuln.today

Public exploit code

CVE Published

Feb 19, 2026 - 21:18 nvd

MEDIUM 6.6

DescriptionGitHub Advisory

NanaZip is an open source file archive Starting in version 5.0.1252.0 and prior to version 6.0.1630.0, NanaZip has an out-of-bounds heap read in .NET Single File bundle header parser due to missing bounds check. Opening a crafted file with NanaZip causes a crash or leaks heap data to the user. Version 6.0.1630.0 patches the issue.

AnalysisAI

NanaZip versions 5.0.1252.0 through 6.0.1629.0 contain an out-of-bounds heap read in the .NET Single File bundle parser that can crash the application or expose sensitive heap memory when processing malicious archive files. A local attacker with user privileges can exploit this vulnerability by crafting a specially formatted file, and public exploit code is currently available. No patch is yet available for affected users.

Technical ContextAI

Classified as CWE-126 (Buffer Over-read). Affects Nanazip. NanaZip is an open source file archive Starting in version 5.0.1252.0 and prior to version 6.0.1630.0, NanaZip has an out-of-bounds heap read in .NET Single File bundle header parser due to missing bounds check. Opening a crafted file with NanaZip causes a crash or leaks heap data to the user. Version 6.0.1630.0 patches the issue.