Use of cache containing sensitive information in undici - CVE-2026-9678

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Main Vulnerability Database Vulnerabilities #VU134755

Use of cache containing sensitive information in undici - CVE-2026-9678

Published: June 17, 2026


Vulnerability identifier: #VU134755
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-9678
CWE-ID: CWE-524
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to use of cache containing sensitive information in the cache interceptor when processing responses with whitespace-padded qualified private or no-cache directives in the Cache-Control header. A remote attacker can send requests that resolve to the same cache key to disclose sensitive information.

Only applications that explicitly enable interceptors.cache() in shared-cache mode, forward Authorization headers upstream, and receive cacheable responses with non-canonical qualified directives are vulnerable.


Affected software

undici
Netezza Appliance
Netezza Appliance - Cyclops
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Fedora
IBM Maximo Application Suite
nodejs24

How to mitigate CVE-2026-9678

Install security update from vendor's website.

undici - addressed in versions 7.28.0, 8.5.0
Netezza Appliance - update to 1.0.2.0
IBM Maximo Application Suite - addressed in versions 9.0.29, 9.1.21, 9.2.2
Netezza Appliance - Cyclops - update to 11.3.1.4
nodejs24 - update to 24.18.0-1.fc44

External References

Related Security Bulletins