Undici vulnerable to data leak when using response.arrayBuffer()

published 2024-07-08 2 y ago modified 2026-09-10 1 mo ago also EUVD-2024-2235 , GHSA-3g92-w8c5-73pq

cvss: 2.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits: 0; none known

Undici is an HTTP/1.1 client, written from scratch for Node.js. Depending on network and process conditions of a `fetch()` request, `response.arrayBuffer()` might include portion of memory from the Node.js process. This has been patched in v6.19.2.

Patch / fix

fixed in 2 links 2

npm undici 6.19.2
nodejs undici 6.19.2

github.com/nodejs/undici@f979ec3 commit
github.com/nodejs/undici#3338 pull request

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-07-11)

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	2.0	CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N
GitHub	3.1	2.0	CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	undici	>=6.14.0, <6.19.2	6.19.2

Affected products

nodejs undici

Classification

Weakness

CWE-201 Insertion of Sensitive Information Into Sent Data

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