CVE-2026-119036
Low risk· EPSS 7%Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
Business::GoCardless versions before 1.01 for Perl allow memory exhaustion by flattening legacy webhook payloads before checking their signature. A payload with a top-level "payload" key is flattened into key-value pairs, where a long key holding a long array costs memory proportional to the key length times the array length.
Risk Assessment
A remote attacker can exhaust memory in the process receiving webhooks with a single request that carries no valid signature.
Recommendation
Update Business::GoCardless to version 1.01 or later.
Other vulnerabilities in Business::GoCardless
See all- CVE-2026-119038Low risk· EPSS 6%
Business::GoCardless versions before 1.01 for Perl complete redirect flows without checking the session token, letting a leaked redirect flow ID create payments against another customer's mandate. confirm_resource takes no session token from the caller and always accepts the flow, and since version 1.00 a flow with a mandate is returned as confirmed without being completed again.
- CVE-2026-119037Low risk· EPSS 2%
Business::GoCardless versions before 1.01 for Perl accept forged webhooks when a configured webhook secret is undef or empty. signature_valid uses each configured secret as the HMAC key, and Digest::SHA treats undef and an empty string as an empty key.
Original NVD description (English source)
Business::GoCardless versions before 1.01 for Perl allow memory exhaustion by flattening legacy webhook payloads before checking their signature. A webhook body with a top-level "payload" key is verified as a legacy webhook. To rebuild the signed string, the payload is flattened into one key and value pair per leaf, each key carrying the full path to that leaf, and the pairs are then encoded, sorted and joined. A long key holding a long array costs memory proportional to the key length times the array length. A remote attacker can exhaust memory in the process receiving webhooks with a single request that carries no valid signature.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS