What is CVE-2026-15157?

CVE-2026-15157 is a medium-severity vulnerability in Undici, classified under CRLF Injection. CVSS score: 4.2/10. Published 2026-07-29.

How severe is CVE-2026-15157?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Vulnerability in Undici

CVE-2026-15157

undici does not validate the type property of a duck-typed blob-like request body before using it as the Content-Type header on the HTTP/1.1 dispatcher. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8…

Vulnerability class: CRLF Injection

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Undici — versions 0, 6.28.0, 7.0.0

Weakness classification (CWE)

CWE-93 — CRLF Injection

References

ce714d77-add3-4f53-aff5-83d477b104bb
ce714d77-add3-4f53-aff5-83d477b104bb

Frequently asked questions

What is CVE-2026-15157?: CVE-2026-15157 is a medium-severity vulnerability in Undici, classified under CRLF Injection. CVSS score: 4.2/10. Published 2026-07-29.
How severe is CVE-2026-15157?: Medium severity. CVSS v3 base score is 4.2 out of 10.