CVE Catalog

CVE-2026-54649

LowCVSS 2.1
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Elevated risk
0.84%

56th percentile - higher than 56% of all known CVEs

Summary

In punchin-email before version 1.5.0, handleInbound delivers inbound alias mail with message.forward(), which silently drops the added Reply-To header intended to route responses through the relay. When a correspondent sends mail to an alias and the operator replies, the mail client can send directly to the correspondent from the private FORWARD_TO inbox address, exposing that address. The disclosure is limited to the operator's own email address and does not expose third-party data or provide code execution or authentication bypass.

Risk Assessment

The operator's private email address (FORWARD_TO) may be disclosed to correspondents, potentially leading to unwanted contact or phishing. There is no risk of third-party data exposure or account takeover.

Recommendation

Upgrade punchin-email to version 1.5.0 or later. Consider using a dedicated forwarding email address that does not reveal the private address.

Related vulnerabilities

Original NVD description (English source)

punchin-email is a Cloudflare Email Worker that provides two-way role aliases while relaying mail to a private inbox. Prior to 1.5.0, handleInbound delivers inbound alias mail with message.forward(), which silently drops the added Reply-To header intended to route responses through the relay. When a correspondent sends mail to an alias and the operator replies, the mail client can send directly to the correspondent from the private FORWARD_TO inbox address, exposing that address. The disclosure is limited to the operator's own email address and does not expose third-party data or provide code execution or authentication bypass. This issue is fixed in version 1.5.0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS