| Package | Affected versions | Patched versions |
|---|---|---|
| @fastly/js-compute | ≥ 3.0.0, < 3.16.0 | 3.16.0 |
The implementation of the following functions were determined to include a use-after-free bug:
FetchEvent.client.tlsCipherOpensslNameFetchEvent.client.tlsProtocolFetchEvent.client.tlsClientCertificateFetchEvent.client.tlsJA3MD5FetchEvent.client.tlsClientHelloCacheEntry.prototype.userMetadata of the fastly:cache subsystemDevice.lookup of the fastly:device subsystemThis bug could allow for an unintended data leak if the result of the preceding functions were sent anywhere else, and often results in a Compute service crash causing an HTTP 500 error to be returned. As all requests to Compute are isolated from one another, the only data at risk is data present for a single request.
This bug has been fixed in version 3.16.0 of the @fastly/js-compute package.
There are no workarounds for this bug, any use of the affected functions introduces the possibility of a data leak or crash in guest code.
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