bestzip before 2.2.6 and 3.0.x before 3.0.2 Argument Injection via Missing Option Delimiter (CVE-2026-80427) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80427

bestzip before 2.2.6 and 3.0.x before 3.0.2 Argument Injection via Missing Option Delimiter

Answer in brief

CVE-2026-80427 records a Unknown severity vulnerability in bestzip before 2.2.6 and 3.0.x before 3.0.2 Argument Injection via Missing Option Delimiter. The current sources do not mark it as known exploited. The current feed maps nfriedly/bestzip (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 26, 2026Updated Aug 26, 2026Source checked Aug 26, 2026First seen by HOL Aug 26, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps nfriedly/bestzip (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
nfriedly/bestzipgeneric	>=0 <2.2.6 \|\| >=3.0.0 <3.0.2	2.2.6, 3.0.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for nfriedly/bestzip.
Review the reported fix. Update nfriedly/bestzip to 2.2.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 26, 2026

Sources and claim methodology

Upstream source description

bestzip builds the argument list for the system zip utility without separating options from operands. The destination archive path and the caller-supplied source paths are passed to the child process with no -- delimiter between them, so any source entry beginning with a hyphen is interpreted by zip as an option rather than a file name. zip accepts -T to test the finished archive and -TT to name the command used to perform that test, so a source list containing those two entries and a command string causes zip to run that command through a shell once the archive has been written. An application that passes a file name or path it received from an untrusted source into the bestzip API therefore executes a command of the supplier's choosing. Versions 2.2.6 and 3.0.2 add the delimiter.

Quoted source text, attributed separately from HOL analysis.