Deserialization of Untrusted Data in graphql-ruby - #VU144319
Published: August 19, 2026
Vulnerability identifier: #VU144319
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-502
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to deserialization of untrusted data in GraphQL::Language::Cache#fetch when parsing files from the parser cache. A local user can place a crafted payload in the expected cache path to execute arbitrary code.
Exploitation requires the application to call GraphQL::Language::Parser.parse_file.
Affected software
graphql-ruby
Remediation
Install security update from vendor's website.
graphql-ruby - update to 2.6.9