# CVE-2026-110777: Evolution-data-server: local file disclosure via attach file:// uris

> Attackers can exfiltrate arbitrary local files by embedding file:// URIs in malicious calendar events within shared CalDAV calendars.

- **Severity:** Medium 5.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-110777, GHSA-vfc3-547x-wpx2, UBUNTU-CVE-2026-110777

## What is CVE-2026-110777?

CVE-2026-110777 is a medium-severity vulnerability in GNOME Red Hat Enterprise Linux 10, published on 14 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A flaw was found in evolution-data-server. Calendar events containing a file:// URI in their ATTACH property automatically read the targeted local file, base64-encode its contents and upload it back to the server when the event is saved. There are no file path restrictions or checks to verify whether the attachment originally came from the server or was added locally. This allows an attacker with access to a shared CalDAV calendar to exfiltrate arbitrary files the user has access to when interacting with malicious calendar events.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-110777?


## How do I fix CVE-2026-110777?

No fix has been published for CVE-2026-110777 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-110777 being exploited?

There is no known exploitation of CVE-2026-110777 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-110777 and fix it if it is affected.

What it is: CVE-2026-110777 is a medium-severity vulnerability in GNOME Red Hat Enterprise Linux 10, published on 14 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-110777 in the wild and no public exploit code.

Affected product: GNOME Red Hat Enterprise Linux 10. 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-2026-110777/ (Markdown: https://insights.sbomify.com/CVE-2026-110777/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-110777
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-110777
- OSV: https://osv.dev/vulnerability/CVE-2026-110777

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-110777/
Summaries are generated and may contain mistakes; the official description above is the record.