What is CVE-2026-9678?

CVE-2026-9678 is a medium-severity vulnerability in Undici, classified under Use of Cache Containing Sensitive Information. CVSS score: 5.9/10. Published 2026-06-17.

How severe is CVE-2026-9678?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Undici

CVE-2026-9678

Impact: Undici's cache interceptor incorrectly classifies some responses as cacheable when the upstream Cache-Control header uses whitespace-padded qualified private or no-cache field names such as private=" authorization" or no-cache="\ta…

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Undici — versions 7.0.0, 7.28.0, 8.0.0

Weakness classification (CWE)

CWE-524 — Use of Cache Containing Sensitive Information

References

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

Frequently asked questions

What is CVE-2026-9678?: CVE-2026-9678 is a medium-severity vulnerability in Undici, classified under Use of Cache Containing Sensitive Information. CVSS score: 5.9/10. Published 2026-06-17.
How severe is CVE-2026-9678?: Medium severity. CVSS v3 base score is 5.9 out of 10.