CVE-2026-54659: Pagy I18n locale option is not validated before being used in a file path

Severity: medium (CVSS 6.9 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-28 · updated 2026-10-23
Weakness: CWE-22

Description

Pagy is agnostic pagination in plain Ruby. From 43.0.0 until 43.5.6, Pagy::I18n.locale= in gem/lib/pagy/modules/i18n/i18n.rb stored locale values verbatim and later used them as <locale>.yml path components, allowing untrusted params[:locale] values with absolute paths or ../ sequences to create a file existence and readability oracle for YAML files. This issue is fixed in version 43.5.6.

Affected products

ddnexus pagy: from 43.0.0, < 43.5.6

References

https://github.com/ddnexus/pagy/commit/efcf09690e9fa7d7abdfb987b785a55f87e287df
https://github.com/ddnexus/pagy/pull/908
https://github.com/ddnexus/pagy/releases/tag/43.5.6
https://github.com/ddnexus/pagy/security/advisories/GHSA-2xmw-f8j8-wfxc
https://github.com/ddnexus/pagy/security/advisories/GHSA-2xmw-f8j8-wfxc

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