CVE-2026-62641 Denial of service in Webmail

What is CVE-2026-62641?

CVE-2026-62641 is a medium-severity denial of service vulnerability in Roundcube Webmail, published on 14 Jul 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

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.

Weakness: CWE-770

Which versions are affected by CVE-2026-62641?

It affects 1 product.

Products include Roundcube Webmail.

How do I fix CVE-2026-62641?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-62641 being exploited?

There is no known exploitation of CVE-2026-62641 in the wild and no public exploit code.

Other vulnerabilities in Roundcube Webmail

• CVE-2024-42009 RoundCube Webmail Cross-Site Scripting Exploited Critical 9.3
• CVE-2025-68461 RoundCube Webmail Cross-site Scripting Exploited High 7.2
• CVE-2008-5619 PHPMailer susceptible to arbitrary code execution Critical 10.0
• CVE-2024-37385 Command injection in n/a Critical 9.8
• CVE-2024-42008 Cross-site scripting in n/a Critical 9.3

All Roundcube Webmail vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-62641, GHSA-wvvp-c8qh-3cc5, UBUNTU-CVE-2026-62641.