CVE-2026-42446
NanaZip: Stack out-of-bounds read in NanaZip ZealFS bitmap parser
Description
NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a stack-based out-of-bounds read exists in the ZealFS filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted ZealFS v1 filesystem image. An attacker-controlled BitmapSize field in the file header drives an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure. This vulnerability is fixed in 6.0.1698.0.
INFO
Published Date :
May 12, 2026, 8:16 p.m.
Last Modified :
Oct. 26, 2026, 6:10 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update NanaZip to version 6.0.1698.0 or later.
- Avoid opening untrusted ZealFS v1 filesystem images.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42446.
| URL | Resource |
|---|---|
| https://github.com/M2Team/NanaZip/security/advisories/GHSA-4c79-hfr4-mqv9 | Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42446 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42446
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42446 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42446 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: NanaZip de M2Team, Description: NanaZip es un archivador de archivos de código abierto. Desde 5.0.1252.0 hasta antes de 6.0.1698.0, existe una lectura fuera de límites basada en pila en el analizador de imágenes de sistema de archivos ZealFS en NanaZip. La vulnerabilidad se activa al abrir una imagen de sistema de archivos ZealFS v1 manipulada. Un campo BitmapSize controlado por el atacante en la cabecera del archivo provoca un bucle ilimitado que lee más allá del final de una estructura ZEALFS_V1_HEADER asignada en la pila. Esta vulnerabilidad está corregida en 6.0.1698.0. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'M2Team', 'product': 'NanaZip', 'versions': [{'status': 'affected', 'version': '>= 5.0.1250.0, < 6.0.1698.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-42446', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-13T14:17:07.741491Z'} -
Initial Analysis by [email protected]
May. 14, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:m2team:nanazip:*:*:*:*:*:*:*:* versions from (including) 5.0.1252.0 up to (excluding) 6.0.1698.0 Added Reference Type GitHub, Inc.: https://github.com/M2Team/NanaZip/security/advisories/GHSA-4c79-hfr4-mqv9 Types: Mitigation, Vendor Advisory -
New CVE Received by [email protected]
May. 12, 2026
Action Type Old Value New Value Added Description NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a stack-based out-of-bounds read exists in the ZealFS filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted ZealFS v1 filesystem image. An attacker-controlled BitmapSize field in the file header drives an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure. This vulnerability is fixed in 6.0.1698.0. Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L Added CWE CWE-125 Added Reference https://github.com/M2Team/NanaZip/security/advisories/GHSA-4c79-hfr4-mqv9