PT-2026-40101 · Junoclaw · Junoclaw

CVE-2026-43989 · Published 2026-05-12 · Updated 2026-05-12

Positive Technologies (AI Summary)

CVSS v3.1

8.5

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

Name of the Vulnerable Software and Affected Versions JunoClaw versions prior to 0.x.y-security-1

Description The upload wasm MCP tool allows an agent to provide a filesystem path and upload the resulting bytes without validation of the file location, symlink target, file size, or file format.

Recommendations Update to version 0.x.y-security-1.

Exploit

Fix

RCE

Path traversal

Link Following

Weakness Enumeration

CWE-20

CWE-73

CWE-22

CWE-59

Related Identifiers

CVE-2026-43989

GHSA-RW59-34HW-PMWP

Affected Products

Junoclaw

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43989.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-43989 · Security Note
• https://osv.dev/vulnerability/CVE-2026-43989 · Vendor Advisory
• https://github.com/Dragonmonk111/junoclaw/releases/tag/v0.x.y-security-1 · Note
• https://github.com/Dragonmonk111/junoclaw/security/advisories/GHSA-rw59-34hw-pmwp · Note
• https://github.com/Dragonmonk111/junoclaw/commit/a7886cd · Note