CVE-2026-62642: CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop') in Roundcube Webmail
An infinite loop vulnerability exists in the TNEF decoder of Roundcube Webmail versions 1.6.0 and 1.7.0. This flaw may cause a denial of service when a user opens an email containing a TNEF attachment. The vulnerability is identified as CWE-835 and has a medium severity rating with a CVSS score of 4.3. No official patch or remediation guidance is currently provided by the vendor.
AI Analysis
Technical Summary
CVE-2026-62642 describes an infinite loop condition in the TNEF decoder component of Roundcube Webmail. This occurs in versions 1.6.0 and 1.7.0, where the loop's exit condition is unreachable, causing the application to hang or become unresponsive when processing specially crafted TNEF attachments. The vulnerability leads to denial of service but does not impact confidentiality or integrity. No known exploits are reported in the wild, and no official fix or patch has been documented at this time.
Potential Impact
Successful exploitation results in denial of service by causing the Roundcube Webmail application to enter an infinite loop when handling TNEF attachments. This disrupts availability for affected users but does not compromise data confidentiality or integrity. There are no reports of active exploitation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution when opening emails with TNEF attachments from untrusted sources to avoid triggering the infinite loop condition.
CVE-2026-62642: CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop') in Roundcube Webmail
Description
An infinite loop vulnerability exists in the TNEF decoder of Roundcube Webmail versions 1.6.0 and 1.7.0. This flaw may cause a denial of service when a user opens an email containing a TNEF attachment. The vulnerability is identified as CWE-835 and has a medium severity rating with a CVSS score of 4.3. No official patch or remediation guidance is currently provided by the vendor.
CVSS v3.1
Score 4.3medium
Affected software
pkg:github/roundcube/roundcubemailRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-62642 describes an infinite loop condition in the TNEF decoder component of Roundcube Webmail. This occurs in versions 1.6.0 and 1.7.0, where the loop's exit condition is unreachable, causing the application to hang or become unresponsive when processing specially crafted TNEF attachments. The vulnerability leads to denial of service but does not impact confidentiality or integrity. No known exploits are reported in the wild, and no official fix or patch has been documented at this time.
Potential Impact
Successful exploitation results in denial of service by causing the Roundcube Webmail application to enter an infinite loop when handling TNEF attachments. This disrupts availability for affected users but does not compromise data confidentiality or integrity. There are no reports of active exploitation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution when opening emails with TNEF attachments from untrusted sources to avoid triggering the infinite loop condition.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-07-14T15:49:17.389Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a56617068715ace43d27058
Added to database: 07/14/2026, 16:18:56 UTC
Last enriched: 07/21/2026, 19:40:20 UTC
Last updated: 08/26/2026, 04:19:07 UTC
Views: 108
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