CVE-2026-103043 anchorme - Denial of Service

anchorme through 3.0.8 contains a regular expression denial of service caused by catastrophic backtracking in the IPv6 host extraction regex, letting attackers block the Node.js event loop and deny service, exploit requires crafted input strings with repeated patterns.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.45% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-1333

Vendor fix

Update to the latest version.

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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