CVE-2026-47222: CWE-125: Out-of-bounds Read in M2Team NanaZip
NanaZip versions from 3.0.1000.0 up to but not including 6.0.1698.0 contain a heap out-of-bounds read vulnerability in the Android Verified Boot (AVB) vbmeta image parser. This is caused by an unsigned integer underflow in a bounds check, allowing a crafted .avb or .img file to trigger a read beyond the allocated buffer, leading to a deterministic crash (denial of service). The issue has been patched in version 6.0.1698.0 and later.
AI Analysis
Technical Summary
CVE-2026-47222 is a heap out-of-bounds read vulnerability in NanaZip's AVB vbmeta image parser, inherited from the upstream 7-Zip AvbHandler. The vulnerability arises from an unsigned integer underflow in a bounds check, which allows an attacker-controlled value_num_bytes field to bypass validation. This causes the AddNameToString function to read up to approximately 4 GiB past the end of a 64 KiB heap buffer, resulting in a deterministic crash when opening a maliciously crafted .avb or .img file. The flaw affects NanaZip versions >=3.0.1000.0 and <6.0.1698.0 and has been fixed in stable version 6.0.1698.0 and preview version 6.5.1742.0.
Potential Impact
Successful exploitation causes a denial of service via a deterministic crash of NanaZip when processing crafted AVB vbmeta images. There is no indication of confidentiality or integrity impact. The CVSS 3.1 base score is 5.4 (medium severity), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, low confidentiality impact, no integrity impact, and low availability impact.
Mitigation Recommendations
A fix is available in NanaZip stable version 6.0.1698.0 and preview version 6.5.1742.0. Users should upgrade to these versions or later to remediate this vulnerability. No other mitigation or workaround is indicated.
CVE-2026-47222: CWE-125: Out-of-bounds Read in M2Team NanaZip
Description
NanaZip versions from 3.0.1000.0 up to but not including 6.0.1698.0 contain a heap out-of-bounds read vulnerability in the Android Verified Boot (AVB) vbmeta image parser. This is caused by an unsigned integer underflow in a bounds check, allowing a crafted .avb or .img file to trigger a read beyond the allocated buffer, leading to a deterministic crash (denial of service). The issue has been patched in version 6.0.1698.0 and later.
CVSS v3.1
Score 5.4medium
Affected software
pkg:github/m2team/NanaZipRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-47222 is a heap out-of-bounds read vulnerability in NanaZip's AVB vbmeta image parser, inherited from the upstream 7-Zip AvbHandler. The vulnerability arises from an unsigned integer underflow in a bounds check, which allows an attacker-controlled value_num_bytes field to bypass validation. This causes the AddNameToString function to read up to approximately 4 GiB past the end of a 64 KiB heap buffer, resulting in a deterministic crash when opening a maliciously crafted .avb or .img file. The flaw affects NanaZip versions >=3.0.1000.0 and <6.0.1698.0 and has been fixed in stable version 6.0.1698.0 and preview version 6.5.1742.0.
Potential Impact
Successful exploitation causes a denial of service via a deterministic crash of NanaZip when processing crafted AVB vbmeta images. There is no indication of confidentiality or integrity impact. The CVSS 3.1 base score is 5.4 (medium severity), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, low confidentiality impact, no integrity impact, and low availability impact.
Mitigation Recommendations
A fix is available in NanaZip stable version 6.0.1698.0 and preview version 6.5.1742.0. Users should upgrade to these versions or later to remediate this vulnerability. No other mitigation or workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-18T22:25:21.258Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a2c3d54e617e2d83492a81e
Added to database: 06/12/2026, 17:09:40 UTC
Last enriched: 06/19/2026, 18:27:25 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 80
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.