Open-Source Security Intelligence

Know every vulnerability
before it knows you.

DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.

Checkout DevGuard View on GitHub

GHSA-xgch-x3mx-cm3c

MediumCVSS 6.9 / 10

Published Jul 15, 2026·Last modified Jul 15, 2026

Affected Components(0)

No affected components available

Description

The privateNetworks blocklist was found to be missing newly added CIDR ranges. More specifically, the following CIDR ranges were not being blocked:

64:ff9b:1::/48: NAT64 local-use prefix (RFC 8215)
5f00::/16: Segment Routing (SRv6) SIDs (RFC 9602)
3fff::/20: documentation prefix (RFC 9637)
100:0:0:1::/64: Dummy IPv6 Prefix (RFC 9780)

Impact

If exploited, an attacker would potentially be able to reach resources hosted on the IPs residing in the missing ranges.

Workarounds

Disable IPv6 by setting EnableIPv6(false). This is the default behavior of the library.

Resolution

Upgrade to v0.2.4

Credits

safeurl thanks @tonghuaroot for reporting.

Risk Scores

Base Score

6.9

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence

2.7

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS

N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Browse More

Medium severity

Scan your project

Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.