zip: Critical Parser Differential & Security Control Bypass via Dual-Header Inconsistencies (Zip Cloaking) Leading to Arbitrary File Overwrite & RCE

zip-rs zip2

A critical architectural parser differential exists in the zip crate (<= 9.0.4) between random-access archive readers (ZipArchive) and streaming readers (ZipStreamReader). ZipArchive considers the Central Directory File Header (CDFH) authoritative and ignores the filename declared in the Local File Header (LFH).

Do this now

Upgrade zip to 9.0.5 and zip2 to 9.0.5, and avoid extracting untrusted archives until then.

Fix it

zip-rs zip2

Upgrade to zip-rs zip2 9.0.5

zip cargo

cargo update -p zip --precise 9.0.5

First seen: 28 Oct 2026
Last update: 28 Oct 2026, 21:17 UTC
Fixed in: zip 9.0.5
zip-rs zip2 9.0.5
Identifiers: CVE-2026-115905
CVSS: 10.0
Source: GitHub advisory

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## zip: Critical Parser Differential & Security Control Bypass via Dual-Header Inconsistencies (Zip Cloaking) Leading to Arbitrary File Overwrite & RCE
Severity: critical. Patch status: patched.
Affected: zip-rs zip2
Fixed in: zip 9.0.5, zip-rs zip2 9.0.5
Ids: CVE-2026-115905

A critical architectural parser differential exists in the zip crate (<= 9.0.4) between random-access archive readers (ZipArchive) and streaming readers (ZipStreamReader). ZipArchive considers the Central Directory File Header (CDFH) authoritative and ignores the filename declared in the Local File Header (LFH).

## Steps
1. Search every lockfile and manifest (package-lock.json, yarn.lock, pnpm-lock.yaml, requirements*.txt, poetry.lock, uv.lock, composer.lock, go.sum, Cargo.lock, Gemfile.lock) for `zip`. For each hit, compare the installed version with the fix on the same major line: zip 9.0.5, zip-rs zip2 9.0.5. If it's lower, give the exact upgrade command for the package manager this repo uses.
2. Fix by release line: zip: <= 9.0.4 → 9.0.5. zip-rs zip2: 9.0.5.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| zip <= 9.0.4 | fixed | 9.0.5 | — |
| zip-rs zip2 | fixed | 9.0.5 | — |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-115905") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/advisories/GHSA-m665-v7pm-7grj https://github.com/zip-rs/zip2/commit/8068ab480ccf8daa7411424e365fcdbe6d09443e https://github.com/zip-rs/zip2/releases/tag/v9.0.5 https://github.com/zip-rs/zip2/security/advisories/GHSA-m665-v7pm-7grj https://nvd.nist.gov/vuln/detail/CVE-2026-115905
https://pwned.coffee/i/zip-critical-parser-differential-security-control-bypass-cve-2026-115905

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
zip (cargo) <= 9.0.4 9.0.5 GitHub advisory checked 28 Oct
zip-rs zip2 before 9.0.5 9.0.5 CVE record (CNA) checked 28 Oct
Score: CVSS 10.0 (critical). CVSS 4.0 10 (CNA GitHub_M) for CVE-2026-115905
Last checked: 28 Oct 2026, 23:18 UTC

Product	Affected	Fixed in	Source
zip (cargo)	<= 9.0.4	9.0.5	GitHub advisory checked 28 Oct
zip-rs zip2	before 9.0.5	9.0.5	CVE record (CNA) checked 28 Oct

Sources: KEV – CVE record ✓ Vendor ✓

Sources

Wrong fix version, or a source we missed? Send it back to chef@pwned.coffee with the source, and we'll correct it here.

Totalone very hot coffee