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

Severity: medium (CVSS 5.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-14 · updated 2026-10-15
Weakness: CWE-200

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.

Affected products

GNOME evolution-data-server: from 3.26 before 3.62.1 — fixed in 3.62.1
Red Hat Enterprise Linux 10: all versions
Red Hat Enterprise Linux 7: all versions
Red Hat Enterprise Linux 8: all versions
Red Hat Enterprise Linux 9: all versions

How to fix

Upgrade to a fixed version: GNOME evolution-data-server 3.62.1. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-110777 or the next vulnerability affects your stack