CVE-2026-32116Network attack vector

Arbitrary file overwrite via unnormalized received filename

Published Mar 12, 2026 · Updated Mar 12, 2026

Path traversal in Magic Wormhole 0.21.0 through 0.22.0 allows remote authenticated users to overwrite local files during receipt. The receive path uses the sender-supplied filename to choose the destination after a refactor removed receiver-side basename() normalization. A receiver must run wormhole receive, enter the shared code, and accept the transfer; relay servers cannot exploit the flaw.

CVSS severity8.2
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Path traversal in Magic Wormhole 0.21.0 through 0.22.0 allows remote authenticated users to overwrite local files during receipt. The receive path uses the sender-supplied filename to choose the destination after a refactor removed receiver-side basename() normalization. A receiver must run wormhole receive, enter the shared code, and accept the transfer; relay servers cannot exploit the flaw.

The record

CVE
CVE-2026-32116
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
Magic Wormhole
Product
Magic Wormhole
Classifications
CWE-22, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.21.0, < 0.23.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Magic Wormhole · Magic Wormholeversion=>= 0.21.0, < 0.23.0

Published CVSS scores

8.2GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo