{"id":"CVE-2024-38375","aliases":["EUVD-2024-2111","GHSA-mp3g-vpm9-9vqv"],"status":"published","title":"@fastly/js-compute use-after-free in some host call implementations","description":"@fastly/js-compute is a JavaScript SDK and runtime for building Fastly Compute applications. The implementation of several functions were determined to include a use-after-free bug. This bug could allow for unintended data loss if the result of the preceding functions were sent anywhere else, and often results in a guest trap causing services to return a 500. This bug has been fixed in version 3.16.0 of the `@fastly/js-compute` package.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00266,"percentile":0.18597,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2024-06-26T18:46:12Z","modified":"2026-10-28T10:44:13Z","fixes":[{"ecosystem":"npm","package":"@fastly/js-compute","fixed_in":["3.16.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@fastly/js-compute","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.16.0"}]}]},{"source":"osv","ecosystem":"npm","package":"@fastly/js-compute","ranges":[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.16.0"}]}]}],"products":[{"vendor":"fastly","product":"js-compute-runtime"}],"references":[{"url":"https://github.com/fastly/js-compute-runtime/security/advisories/GHSA-mp3g-vpm9-9vqv","tags":["x_refsource_CONFIRM","x_transferred","advisory","web"]},{"url":"https://github.com/fastly/js-compute-runtime/commit/4e16641ef4e159c4a11b500ac861b8fa8d9ff5d3","tags":["x_refsource_MISC","x_transferred","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-38375","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-mp3g-vpm9-9vqv"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/38xxx/CVE-2024-38375.json","tags":["advisory"]},{"url":"https://github.com/fastly/js-compute-runtime","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2024-38375","title":"@fastly/js-compute use-after-free in some host call implementations","description":"@fastly/js-compute is a JavaScript SDK and runtime for building Fastly Compute applications. The implementation of several functions were determined to include a use-after-free bug. This bug could allow for unintended data loss if the result of the preceding functions were sent anywhere else, and often results in a guest trap causing services to return a 500. This bug has been fixed in version 3.16.0 of the `@fastly/js-compute` package.","status":"published","published":"2024-06-26T18:46:12.471Z","modified":"2024-08-02T04:04:25.287Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:34:16.367792Z"}],"euvd":[{"id":"EUVD-2024-2111","description":"@fastly/js-compute is a JavaScript SDK and runtime for building Fastly Compute applications. The implementation of several functions were determined to include a use-after-free bug. This bug could allow for unintended data loss if the result of the preceding functions were sent anywhere else, and often results in a guest trap causing services to return a 500. This bug has been fixed in version 3.16.0 of the `@fastly/js-compute` package.","status":"published","published":"2024-06-26T18:46:12Z","modified":"2024-08-02T04:04:25Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:H","level":"medium"}],"updated_at":"2026-11-03T03:50:18.901913Z"}],"ghsa":[{"id":"GHSA-mp3g-vpm9-9vqv","title":"@fastly/js-compute has a use-after-free in some host call implementations","description":"### Impact\nThe implementation of the following functions were determined to include a use-after-free bug:\n\n* `FetchEvent.client.tlsCipherOpensslName`\n* `FetchEvent.client.tlsProtocol`\n* `FetchEvent.client.tlsClientCertificate`\n* `FetchEvent.client.tlsJA3MD5`\n* `FetchEvent.client.tlsClientHello`\n* `CacheEntry.prototype.userMetadata` of the `fastly:cache` subsystem\n* `Device.lookup` of the `fastly:device` subsystem\n\nThis 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.\n\n### Patches\nThis bug has been fixed in version 3.16.0 of the `@fastly/js-compute` package.\n\n### Workarounds\nThere are no workarounds for this bug, any use of the affected functions introduces the possibility of a data leak or crash in guest code.","status":"published","published":"2024-06-26T19:12:23Z","modified":"2024-06-26T21:56:17Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:H","level":"medium"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:37:55.455438Z"}],"nvd":[{"id":"CVE-2024-38375","description":"@fastly/js-compute is a JavaScript SDK and runtime for building Fastly Compute applications. The implementation of several functions were determined to include a use-after-free bug. This bug could allow for unintended data loss if the result of the preceding functions were sent anywhere else, and often results in a guest trap causing services to return a 500. This bug has been fixed in version 3.16.0 of the `@fastly/js-compute` package.","status":"published","published":"2024-06-26T19:15:13.677Z","modified":"2026-06-17T07:40:01.2Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:10:09.388795Z"}],"osv":[{"id":"CVE-2024-38375","title":"@fastly/js-compute use-after-free in some host call implementations","description":"@fastly/js-compute is a JavaScript SDK and runtime for building Fastly Compute applications. The implementation of several functions were determined to include a use-after-free bug. This bug could allow for unintended data loss if the result of the preceding functions were sent anywhere else, and often results in a guest trap causing services to return a 500. This bug has been fixed in version 3.16.0 of the `@fastly/js-compute` package.","status":"published","published":"2024-06-26T18:46:12.471Z","modified":"2026-10-28T10:44:13.411243785Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:H","level":"medium"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:44:41.133403Z"},{"id":"GHSA-mp3g-vpm9-9vqv","title":"@fastly/js-compute has a use-after-free in some host call implementations","description":"### Impact\nThe implementation of the following functions were determined to include a use-after-free bug:\n\n* `FetchEvent.client.tlsCipherOpensslName`\n* `FetchEvent.client.tlsProtocol`\n* `FetchEvent.client.tlsClientCertificate`\n* `FetchEvent.client.tlsJA3MD5`\n* `FetchEvent.client.tlsClientHello`\n* `CacheEntry.prototype.userMetadata` of the `fastly:cache` subsystem\n* `Device.lookup` of the `fastly:device` subsystem\n\nThis 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.\n\n### Patches\nThis bug has been fixed in version 3.16.0 of the `@fastly/js-compute` package.\n\n### Workarounds\nThere are no workarounds for this bug, any use of the affected functions introduces the possibility of a data leak or crash in guest code.","status":"published","published":"2024-06-26T19:12:23Z","modified":"2026-09-10T03:50:15.651033617Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:H","level":"medium"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:46:52.170928Z"}]}}