CVE-2026-62642

MEDIUM

Published Jul 14, 2026 Modified Jul 20, 2026 CWE-835

Description

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, an infinite loop was discovered in the TNEF decoder, which may lead to denial of service upon opening an email with a TNEF attachment.

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CVSS v3.1 Score

4.3

MEDIUM

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

EPSS — Exploit Prediction

0.0028

Probability of exploitation

0.20%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-835 CWE-835

Affected Products

Vendor	Product	Versions
roundcube	webmail	1.6.0 — 1.6.17
roundcube	webmail	1.7.0 — 1.7.2

References

Advisories & Patches

https://github.com/roundcube/roundcubemail/commit/132ac8dd5a55c8466be12de1daf84355697ffa89 https://github.com/roundcube/roundcubemail/commit/877269c79359d959a94f13c9070cab0f3389c193 https://github.com/roundcube/roundcubemail/commit/a007321346380136b3de2bd75b486b04f63c0d38 https://github.com/roundcube/roundcubemail/commit/fb952956c6eaf29e963f1a718d028d66e7957ce0 https://roundcube.net/news/2026/07/05/security-updates-1.6.17-and-1.7.2

Other References

https://github.com/roundcube/roundcubemail/releases/tag/1.6.17 https://github.com/roundcube/roundcubemail/releases/tag/1.7.2

Frequently Asked Questions

What is CVE-2026-62642? +

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, an infinite loop was discovered in the TNEF decoder, which may lead to denial of service upon opening an email with a TNEF attachment. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-62642? +

CVE-2026-62642 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0028, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-62642? +

CVE-2026-62642 affects products from roundcube, specifically: webmail. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-62642? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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Quick Facts

CVSS Score: 4.3
Severity: MEDIUM
EPSS: 0.0028
Published: Jul 14, 2026

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