# CVE-2026-54649: Information disclosure in punchin-email

> An attacker can discover the operator's private email address when replying to alias mail due to a missing Reply-To header in Cloudflare Email Workers.

- **Severity:** Low 2.1 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Sep 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-2ph7-69xm-hmwv

## What is CVE-2026-54649?

CVE-2026-54649 is a low-severity vulnerability in PunchIn-App punchin-email, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-201 (Insertion of Sensitive Information Into Sent Data), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-54649?


## How do I fix CVE-2026-54649?

No fix has been published for CVE-2026-54649 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-54649 being exploited?

There is no known exploitation of CVE-2026-54649 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54649 and fix it if it is affected.

What it is: CVE-2026-54649 is a low-severity vulnerability in PunchIn-App punchin-email, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-54649 in the wild and no public exploit code.

Affected product: PunchIn-App punchin-email. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-54649/ (Markdown: https://insights.sbomify.com/CVE-2026-54649/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54649
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54649
- OSV: https://osv.dev/vulnerability/CVE-2026-54649

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54649/
Summaries are generated and may contain mistakes; the official description above is the record.