CVE-2026-117518 @fastify/reply-from - Path Traversal

@fastify/reply-from <= 12.8.0 contains a path traversal caused by improper validation of backslash dot-segments in proxy paths, letting unauthenticated attackers access unintended upstream resources, exploit requires crafted path with backslash dot-segments.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Path Traversal
Impact
Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Published
2 November 2026
Updated
3 November 2026
Weakness
CWE-22

Vendor fix

Upgrade to version 12.8.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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