CVE-2026-62641: In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the TNEF decoder was subject to denial of service via a crafted compressed-RTF size

Medium severity · published Jul 14, 2026

CVE-2026-62641

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the TNEF decoder was subject to denial of service via a crafted compressed-RTF size

6.5

CVSS

0.5%

EPSS

On KEV

Description

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the TNEF decoder was subject to denial of service via a crafted compressed-RTF size.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

Required

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.5% · higher than 40% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Webmail · Roundcube

1.6.0 before 1.6.17; 1.7.0 before 1.7.2 · source: vendor, NVD

Affected product

Webmail

Roundcube

All Webmail CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-62641

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-62641

Patch

https://github.com/roundcube/roundcubemail/commit/6d1004fd3764a9606c53130b322c0f295c38be64

Patch

https://github.com/roundcube/roundcubemail/commit/bf253c72d4293c93fda511b8464fe9cb34b522c1

Release Notes

https://github.com/roundcube/roundcubemail/releases/tag/1.6.17

Release Notes

https://github.com/roundcube/roundcubemail/releases/tag/1.7.2

Vendor Advisory

https://roundcube.net/news/2026/07/05/security-updates-1.6.17-and-1.7.2