Security readout for executives and security teams
Plain-English summary
CVE-2026-27711 affects NanaZip when a user opens or lists a specially crafted UFS, UFS2, or IMG archive. The main expected impact is a crash or hang, but the advisory notes potentially exploitable heap corruption. This is not reported as actively exploited in the provided sources.
Executive priority
Treat as a targeted user-file handling risk. Prioritize updating endpoints where NanaZip is installed and users handle externally sourced archives or disk images. Business urgency is moderate because exploitation needs user interaction, but crashes and potential memory corruption justify prompt remediation.
Technical view
NanaZip versions 5.0.1252.0 through below 6.0.1638.0, and 6.1 through below 6.5.1638.0, contain memory corruption in the UFS archive parser. An unvalidated directory record length can cause out-of-bounds memory access during normal archive open/listing. CVSS 4.0 score is 5.1, with local attack vector and user interaction required.
Likely exposure
Exposure is limited to systems with affected NanaZip versions where users may open untrusted .ufs, .ufs2, or .img files. The CVSS vector indicates local access, low complexity, privileges required, and user interaction required.
Exploitation context
The provided sources do not show active exploitation or KEV listing. Exploitation requires a crafted archive and a user-driven open/listing action. Reported outcomes include process crash, hang, and possible heap corruption.
Researcher notes
Evidence is limited to the CVE record and vendor GitHub advisory. The weakness is listed as CWE-125, although the description also references heap corruption. Do not assume remote, wormable, or confirmed code execution behavior from the provided sources.
Mitigation direction
- Upgrade NanaZip to 6.0.1638.0 or 6.5.1638.0, as applicable.
- Avoid opening untrusted .ufs, .ufs2, or .img files until updated.
- Check the GitHub advisory for any newer vendor guidance.
Validation and detection
- Inventory NanaZip installations and record exact version numbers.
- Confirm affected ranges: >=5.0.1252.0 <6.0.1638.0 or >=6.1 <6.5.1638.0.
- Verify updated systems report version 6.0.1638.0 or 6.5.1638.0.
- Review endpoint telemetry for NanaZip crashes involving UFS, UFS2, or IMG files.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-27711 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
5.1MediumVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/M2Team/NanaZip/security/advisories/GHSA-rjwv-4w7x-hc9cCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.