@fastly/js-compute use-after-free in some host call implementations

published 2024-06-26 2 y ago modified 2026-09-10 1 mo ago also EUVD-2024-2111 , GHSA-mp3g-vpm9-9vqv

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits: 0; none known

@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.

Patch / fix

fixed in 2 links 1

npm @fastly/js-compute 3.16.0
fastly js-compute 3.16.0

github.com/fastly/js-compute-runtime@4e16641 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-07-30)

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:H
GitHub	3.1	5.3	CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	@fastly/js-compute	>=3.0.0, <3.16.0	3.16.0

Affected products

fastly js-compute-runtime

Classification

Weakness

CWE-416 Use After Free

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary