---
id: CVE-2026-88383
title: >-
  libical 4.0.6 contains an incompatible function pointer in
  icalparameter_string_to_kind()
summary: >-
  libical 4.0.6 contains an incompatible function pointer in
  icalparameter_string_to_kind(). When parsing iCalendar data containing a
  parameterized property, the function passes icalparameter_compare_kind_map()
  to bsearch() through an inco…
severity: medium
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:04:40.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88383'
references:
  - url: 'https://github.com/libical/libical/issues/1361'
    label: cve@mitre.org
  - url: 'https://github.com/libical/libical/pull/1363'
    label: cve@mitre.org
  - url: >-
      https://github.com/libical/libical/pull/1363/changes/557d9c043733b33a8511dce41fdeeb508460d5a9
    label: cve@mitre.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88383.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-88383'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540578'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-88383'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88383'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-24T16:47:15.848Z'
vendor: Red Hat
product: Red Hat Enterprise Linux 7
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-843
epss: 0.00166
epssPercentile: 0.05192
---

## Overview

libical 4.0.6 contains an incompatible function pointer in icalparameter_string_to_kind(). When parsing iCalendar data containing a parameterized property, the function passes icalparameter_compare_kind_map() to bsearch() through an incompatible comparator function pointer type. bsearch() invokes the callback through the mismatched type, resulting in undefined behavior and process termination, leading to denial of service.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88383.json)