Skip to content
Fencer Vulns
medium 6.2

CVE-2026-88383 json

libical 4.0.6 contains an incompatible function pointer in icalparameter_string_to_kind().

published 2026-09-24 46 d ago modified 2026-10-06 33 d ago also EUVD-2026-86316

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

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 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.

Patch / fix

  • libical Azure Linux 3.0 3.0.10-3

azure linux advisories AZL-106797

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-88383 updated cvss 6.5

libical: libical: Denial of Service via crafted iCalendar property parsing

  • Red Hat Enterprise Linux 6 libical 3.0.18-3.el10
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libical, libical-glib, compat-libical1, libical 3.0.18-3.el10 Red Hat Enterprise Linux 8 libical 3.0.18-3.el10 Red Hat Enterprise Linux 9 libical-glib, libical 3.0.18-3.el10 Red Hat Enterprise Linux 10 libical 3.0.18-3.el10
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
34 d ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/libical/libical/issues/1361 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.