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Vulnerabilities

Vulnerability · CVE-2026-110777

A flaw was found in evolution-data-server.

Published Oct 14, 2026 · catalog updated Oct 16, 2026 · Red Hat Red Hat Enterprise Linux 10

Check if you run it

No confirmed exploitation is on record for CVE-2026-110777. EPSS is 0.39%. Act only if a listed version of Red Hat Red Hat Enterprise Linux 10 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Advisory link
Affected products
Debian:12 evolution-data-server · Debian:13 evolution-data-server · Debian:14 evolution-data-server · vendor Red Hat Red Hat Enterprise Linux 10 · vendor Red Hat Red Hat Enterprise Linux 6 · vendor Red Hat Red Hat Enterprise Linux 7

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 evolution-data-server3.46.4-2, 3.46.4-2+deb12u1, 3.47.2-1
  • Debian:13 evolution-data-server3.56.1-2, 3.56.2-0+deb13u1, 3.56.2-1
  • Debian:14 evolution-data-server3.56.1-2, 3.56.2-1, 3.56.2-2
  • vendor Red Hat Red Hat Enterprise Linux 10version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 6version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 7version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 8version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 9version unspecified

How to fix CVE-2026-110777

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-110777. EPSS is 0.39%. Act only if a listed version of Red Hat Red Hat Enterprise Linux 10 is installed.

Which versions are affected?

Compare what you have installed with 3.46.4-2, 3.46.4-2+deb12u1, 3.47.2-1, 3.56.1-2, 3.56.2-0+deb13u1, 3.56.2-1, 3.56.1-2, 3.56.2-1, 3.56.2-2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-200: Exposure of Sensitive Information. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2026 · NIST NVD

    Detected

    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

  2. Oct 14, 2026 · NIST NVD

    Updated

    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

  3. Oct 14, 2026 · NIST NVD

    Updated

    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

  4. Oct 15, 2026 · NIST NVD

    Updated

    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

  5. Oct 15, 2026 · NIST NVD

    Updated

    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

  6. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2026-110777

    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 che

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-110777

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-110777

    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 che

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-110777
    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.