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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… (CVE-2026-62642)

0
Medium
VulnerabilityCVE-2026-62642gcveosvubuntu-cve-2026-62642cve-2026-62642ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-pro-22-04-ltsubuntu-pro-24-04-ltsubuntu-26-10ubuntu-pro-26-04-lts
Published: 07/14/2026 (07/14/2026, 16:17:00 UTC)
Source: GCVE Database
Product: roundcube

Description

An infinite loop vulnerability exists in the TNEF decoder of Roundcube Webmail versions before 1.6.17 and 1.7.x before 1.7.2. This flaw can cause a denial of service when an email containing a TNEF attachment is opened.

CVSS v3.1

Score 6.5medium

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected software

Ubuntu:Pro:16.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/xenial
Affected versions
=1.1.1+dfsg.1-2=1.1.2+dfsg.1-5=1.1.3+dfsg.1-1=1.1.4+dfsg.1-1=1.2~beta+dfsg.1-0ubuntu1=1.2~beta+dfsg.1-0ubuntu1+esm1=1.2~beta+dfsg.1-0ubuntu1+esm2=1.2~beta+dfsg.1-0ubuntu1+esm3=1.2~beta+dfsg.1-0ubuntu1+esm4=1.2~beta+dfsg.1-0ubuntu1+esm5=1.2~beta+dfsg.1-0ubuntu1+esm6=1.2~beta+dfsg.1-0ubuntu1+esm7=1.2~beta+dfsg.1-0ubuntu1+esm8
Ubuntu:Pro:18.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/bionic
Affected versions
=1.3.0+dfsg.1-1=1.3.1+dfsg.1-1=1.3.3+dfsg.1-1=1.3.3+dfsg.1-2=1.3.6+dfsg.1-1=1.3.6+dfsg.1-1ubuntu0.1~esm1=1.3.6+dfsg.1-1ubuntu0.1~esm2=1.3.6+dfsg.1-1ubuntu0.1~esm3=1.3.6+dfsg.1-1ubuntu0.1~esm4=1.3.6+dfsg.1-1ubuntu0.1~esm5=1.3.6+dfsg.1-1ubuntu0.1~esm6=1.3.6+dfsg.1-1ubuntu0.1~esm7=1.3.6+dfsg.1-1ubuntu0.1~esm8
Ubuntu:Pro:20.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/focal
Affected versions
=1.3.8+dfsg.1-2=1.3.10+dfsg.1-1=1.4.1+dfsg.1-2=1.4.2+dfsg.1-1=1.4.2+dfsg.1-2=1.4.3+dfsg.1-1=1.4.3+dfsg.1-1ubuntu0.1~esm1=1.4.3+dfsg.1-1ubuntu0.1~esm2=1.4.3+dfsg.1-1ubuntu0.1~esm3=1.4.3+dfsg.1-1ubuntu0.1~esm4=1.4.3+dfsg.1-1ubuntu0.1~esm5=1.4.3+dfsg.1-1ubuntu0.1~esm6=1.4.3+dfsg.1-1ubuntu0.1~esm7=1.4.3+dfsg.1-1ubuntu0.1~esm8
Ubuntu:Pro:22.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/jammy
Affected versions
=1.4.11+dfsg.1-4=1.5.0+dfsg.1-2=1.5.0+dfsg.1-2ubuntu0.1~esm1=1.5.0+dfsg.1-2ubuntu0.1~esm2=1.5.0+dfsg.1-2ubuntu0.1~esm3=1.5.0+dfsg.1-2ubuntu0.1~esm4=1.5.0+dfsg.1-2ubuntu0.1~esm5=1.5.0+dfsg.1-2ubuntu0.1~esm6
Ubuntu:Pro:24.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/noble
Affected versions
=1.6.2+dfsg-1=1.6.4+dfsg-1=1.6.5+dfsg-1=1.6.6+dfsg-1=1.6.6+dfsg-2=1.6.6+dfsg-2ubuntu0.1=1.6.6+dfsg-2ubuntu0.1+esm1=1.6.6+dfsg-2ubuntu0.1+esm2=1.6.6+dfsg-2ubuntu0.1+esm3
Ubuntu:26.10more threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=stonking
Affected versions
=1.6.11+dfsg-1
Ubuntu:Pro:26.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/resolute
Affected versions
=1.6.11+dfsg-1=1.6.11+dfsg-1ubuntu0.26.04.1~esm1

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/18/2026, 00:17:42 UTC

Technical Analysis

CVE-2026-62642 describes an infinite loop vulnerability in the TNEF decoder component of Roundcube Webmail. This issue affects versions prior to 1.6.17 and 1.7.x prior to 1.7.2. When a user opens an email with a specially crafted TNEF attachment, the decoder enters an infinite loop, leading to denial of service conditions by exhausting resources or causing the application to hang.

Potential Impact

The vulnerability results in denial of service (DoS) by causing the Roundcube Webmail application to enter an infinite loop upon processing a malicious TNEF attachment. There is no indication of confidentiality or integrity impact. The CVSS v3.1 base score is 6.5 (medium severity), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and impact limited to availability.

Mitigation Recommendations

No explicit patch or remediation information is provided in the source data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is applied, users should exercise caution when opening emails with TNEF attachments from untrusted sources.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-62642
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:26.10","Ubuntu:Pro:26.04:LTS"]
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6ad3f5c72cdf04f6566628e7

Added to database: 10/17/2026, 22:25:11 UTC

Last enriched: 10/18/2026, 00:17:42 UTC

Last updated: 10/18/2026, 00:17:42 UTC

Views: 2

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