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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. (CVE-2026-62641)

0
Medium
VulnerabilityCVE-2026-62641gcveosvubuntu-cve-2026-62641cve-2026-62641ubuntu-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

A denial of service vulnerability exists in the TNEF decoder of Roundcube Webmail versions before 1.6.17 and 1.7.x before 1.7.2. This issue is triggered by a crafted compressed-RTF size that causes the service to become unavailable.

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

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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/18/2026, 00:17:47 UTC

Technical Analysis

CVE-2026-62641 describes a denial of service vulnerability in the TNEF decoder component of Roundcube Webmail. Versions prior to 1.6.17 and 1.7.x prior to 1.7.2 are affected. The vulnerability arises when the decoder processes a specially crafted compressed-RTF size, leading to denial of service conditions. The CVSS 3.1 base score is 6.5, indicating a medium severity impact with network attack vector, low attack complexity, no privileges required, user interaction required, and impact limited to availability.

Potential Impact

Successful exploitation results in denial of service, causing the affected Roundcube Webmail service to become unavailable. There is no impact on confidentiality or integrity reported.

Mitigation Recommendations

A fix is available in Roundcube Webmail versions 1.6.17 and 1.7.2 and later. Users should upgrade to these or newer versions to remediate the vulnerability. No additional mitigation steps are indicated.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-62641
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: 6ad3f5c72cdf04f6566628e8

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

Last enriched: 10/18/2026, 00:17:47 UTC

Last updated: 10/18/2026, 00:17:47 UTC

Views: 2

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