CVE-2026-54649
LowCVSS 2.1Exploitation Probability (EPSS)
Elevated risk56th 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.
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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

