CVE-2019-11705

libical: Stack buffer overflow in icalrecur_add_bydayrules in icalrecur.c

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Severity

Important

Red Hat Product Security

9.8

CVSS 3.0

Review impact separately from score.

Published · June 13, 2019

Updated · January 9, 2026

Description

A flaw in Thunderbird's implementation of iCal causes a stack buffer overflow in icalrecur_add_bydayrules when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Thunderbird can be configured to use icaljs instead of libical by setting calendar.icaljs = true in preferences, mitigating this vulnerability.

CVSS / CWE

CVSS 3.0 · 9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-121 · Stack-based Buffer Overflow