CVE-2026-119036: vulnerability in Business-GoCardless
Business::GoCardless versions before 1.01 for Perl allow memory exhaustion by flattening legacy webhook payloads before checking their signature
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.2%
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.
Affected products
Business-GoCardlessRelated CVEs — Business-GoCardless
In the same product, most dangerous first.
CVE-2026-119038—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 mandateEPSS 0.2%CVE-2026-119037—Business::GoCardless versions before 1.01 for Perl accept forged webhooks when a configured webhook secret is undef or emptyEPSS 0.1%