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| purl | pkg:gem/icalendar@2.10.1 |
| Next non-vulnerable version | None. |
| Latest non-vulnerable version | None. |
| Risk | 3.1 |
| Vulnerability | Summary | Fixed by |
|---|---|---|
|
VCID-t2g3-d1e3-5yg4
Aliases: CVE-2026-33635 GHSA-pv9c-9mfh-hvxq |
iCalendar is a Ruby library for dealing with iCalendar files in the iCalendar format defined by RFC-5545. Starting in version 2.0.0 and prior to version 2.12.2, .ics serialization does not properly sanitize URI property values, enabling ICS injection through attacker-controlled input, adding arbitrary calendar lines to the output. `Icalendar::Values::Uri` falls back to the raw input string when `URI.parse` fails and later serializes it with `value.to_s` without removing or escaping `\r` or `\n` characters. That value is embedded directly into the final ICS line by the normal serializer, so a payload containing CRLF can terminate the original property and create a new ICS property or component. (It looks like you can inject via url, source, image, organizer, attach, attendee, conference, tzurl because of this). Applications that generate `.ics` files from partially untrusted metadata are impacted. As a result, downstream calendar clients or importers may process attacker-supplied content as if it were legitimate event data, such as added attendees, modified URLs, alarms, or other calendar fields. Version 2.12.2 contains a patch for the issue. |
Affected by 1 other vulnerability. |
| Vulnerability | Summary | Aliases |
|---|---|---|
| This package is not known to fix vulnerabilities. | ||
| Date | Actor | Action | Vulnerability | Source | VulnerableCode Version |
|---|---|---|---|---|---|
| 2026-06-13T09:28:19.684440+00:00 | Ruby Importer | Affected by | VCID-t2g3-d1e3-5yg4 | https://github.com/rubysec/ruby-advisory-db/blob/master/gems/icalendar/CVE-2026-33635.yml | 38.6.0 |
| 2026-06-12T21:35:40.693172+00:00 | GitLab Importer | Affected by | VCID-t2g3-d1e3-5yg4 | https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/icalendar/CVE-2026-33635.yml | 38.6.0 |