CVE-2022-31163: TZInfo is a Ruby library that provides access to time zone data and allows times to be converted using time zone rules. Versions prior to 0.36.1, as w...

Description

TZInfo is a Ruby library that provides access to time zone data and allows times to be converted using time zone rules. Versions prior to 0.36.1, as well as those prior to 1.2.10 when used with the Ruby data source tzinfo-data, are vulnerable to relative path traversal. With the Ruby data source, time zones are defined in Ruby files. There is one file per time zone. Time zone files are loaded with `require` on demand. In the affected versions, `TZInfo::Timezone.get` fails to validate time zone identifiers correctly, allowing a new line character within the identifier. With Ruby version 1.9.3 and later, `TZInfo::Timezone.get` can be made to load unintended files with `require`, executing them within the Ruby process. Versions 0.3.61 and 1.2.10 include fixes to correctly validate time zone identifiers. Versions 2.0.0 and later are not vulnerable. Version 0.3.61 can still load arbitrary files from the Ruby load path if their name follows the rules for a valid time zone identifier and the file has a prefix of `tzinfo/definition` within a directory in the load path. Applications should ensure that untrusted files are not placed in a directory on the load path. As a workaround, the time zone identifier can be validated before passing to `TZInfo::Timezone.get` by ensuring it matches the regular expression `\A[A-Za-z0-9+\-_]+(?:\/[A-Za-z0-9+\-_]+)*\z`.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.78%

75.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Tzinfo Project	Tzinfo	< 0.3.61
Tzinfo Project	Tzinfo	>= 1.0.0, < 1.2.10
Debian	Debian Linux	10.0

References

https://github.com/tzinfo/tzinfo/commit/9905ca93abf7bf3e387bd592406e403cd18334c7Patch, Third Party Advisory
https://github.com/tzinfo/tzinfo/commit/9eddbb5c0e682736f61d0dd803b6031a5db9eadfPatch, Third Party Advisory
https://github.com/tzinfo/tzinfo/releases/tag/v0.3.61Release Notes, Third Party Advisory
https://github.com/tzinfo/tzinfo/releases/tag/v1.2.10Release Notes, Third Party Advisory
https://github.com/tzinfo/tzinfo/security/advisories/GHSA-5cm2-9h8c-rvfxExploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00009.htmlMailing List, Third Party Advisory
https://github.com/tzinfo/tzinfo/commit/9905ca93abf7bf3e387bd592406e403cd18334c7Patch, Third Party Advisory
https://github.com/tzinfo/tzinfo/commit/9eddbb5c0e682736f61d0dd803b6031a5db9eadfPatch, Third Party Advisory
https://github.com/tzinfo/tzinfo/releases/tag/v0.3.61Release Notes, Third Party Advisory
https://github.com/tzinfo/tzinfo/releases/tag/v1.2.10Release Notes, Third Party Advisory
https://github.com/tzinfo/tzinfo/security/advisories/GHSA-5cm2-9h8c-rvfxExploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00009.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/09/msg00008.html

Timeline

Published: Jul 22, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-31163?

TZInfo is a Ruby library that provides access to time zone data and allows times to be converted using time zone rules. Versions prior to 0.36.1, as well as those prior to 1.2.10 when used with the Ruby data source tzinfo-data, are vulnerable to relative path traversal. With the Ruby data source, time zones are defined in Ruby files. There is one file per time zone. Time zone files are loaded with `require` on demand. In the affected versions, `TZInfo::Timezone.get` fails to validate time zone identifiers correctly, allowing a new line character within the identifier. With Ruby version 1.9.3 and later, `TZInfo::Timezone.get` can be made to load unintended files with `require`, executing them within the Ruby process. Versions 0.3.61 and 1.2.10 include fixes to correctly validate time zone identifiers. Versions 2.0.0 and later are not vulnerable. Version 0.3.61 can still load arbitrary files from the Ruby load path if their name follows the rules for a valid time zone identifier and the file has a prefix of `tzinfo/definition` within a directory in the load path. Applications should ensure that untrusted files are not placed in a directory on the load path. As a workaround, the time zone identifier can be validated before passing to `TZInfo::Timezone.get` by ensuring it matches the regular expression `\A[A-Za-z0-9+\-_]+(?:\/[A-Za-z0-9+\-_]+)*\z`.

How severe is CVE-2022-31163?

CVE-2022-31163 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.78% probability of exploitation in the next 30 days.

How do I fix CVE-2022-31163?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.