CVE-2026-6734High· 7.5▾ TwilightA flaw was found in undici. When using Socks5ProxyAgent, undici incorrectly reuses a single connection pool across different origins. This can lead to cross-origin request routing, where sensitive credentials and data intended for one dest…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the vendor's CSAF advisory record, not NVD.
Exploit-prediction probability, daily snapshots since Jul 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.3%
0.3% → 0.4%
Last analysed / modified upstream
A flaw was found in undici. When using Socks5ProxyAgent, undici incorrectly reuses a single connection pool across different origins. This can lead to cross-origin request routing, where sensitive credentials and data intended for one destination are sent to another. Consequently, responses from unintended origins may be trusted, and secure HTTPS connections could be silently downgraded to unencrypted HTTP, resulting in information disclosure and data integrity issues.
undici: undici: Information disclosure and data integrity issues due to incorrect Socks5ProxyAgent connection routing — rated Important by Red Hat. Released 2026-06-17, updated 2026-09-18.
Affected:
Fixed:
No fix planned:
Not affected:
Before applying this update, make sure all previously released errata relevant to your system have been applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:48151 For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:35841 For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:39868
Workarounds / mitigations:
Affected packages:
undici >= 7.23.0, < 7.28.0undici >= 8.0.0, < 8.2.0Patched in:
undici 7.28.0undici 8.2.0Connected by shared product, vendor, weakness, or advisory.
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