CVE-2022-39218: The JS Compute Runtime for Fastly's Compute@Edge platform provides the environment JavaScript is executed in w

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HIGH 7.5REMOTEUPGRADE

CVE-2022-39218 is a high-severity flaw (CVSS 7.5) affecting js-compute. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The JS Compute Runtime for Fastly's Compute@Edge platform provides the environment JavaScript is executed in when using the Compute@Edge JavaScript SDK. In versions prior to 0.5.3, the `Math.random` and `crypto.getRandomValues` methods fail to use sufficiently random values. The initial value to seed the PRNG (pseudorandom number generator) is baked-in to the final WebAssembly module, making the sequence of random values for that specific WebAsse

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-335
Published	2022-09-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: fastly

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-09-20 20:15 UTCPublished CVE record published
2026-06-17 04:57 UTCUpdated Record last modified

fastly js-compute UPGRADE

Affected: < 0.5.3

Fixed in: 0.5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls js-compute

2. UPGRADE to 0.5.3

npm install js-compute@">=0.5.3"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-39218?

js-compute: upgrade to 0.5.3. Exact commands for each OS are on this page.

Is CVE-2022-39218 being exploited?

CVE-2022-39218 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-39218 affect?

CVE-2022-39218 affects js-compute. Severity is high (CVSS 7.5). The JS Compute Runtime for Fastly's Compute@Edge platform provides the environment JavaScript is executed in when using the Compute@Edge JavaScript SDK. In versions prior to 0.5.3, the `Math.random` and `crypto.getRandomValues` methods fail

How urgent is CVE-2022-39218?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

References

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