CVE-2026-54452

Summary

safeurl is Missing IPv6 CIDR Ranges in Blocklist

Severity

medium

EPSS

0.5% (p44)

CWE

CWE-918

Also known as

GHSA-xgch-x3mx-cm3c

Published

2026-07-15

Updated

2026-07-15

Advisory details

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.

References

• https://github.com/advisories/GHSA-xgch-x3mx-cm3c
• https://github.com/doyensec/safeurl/security/advisories/GHSA-xgch-x3mx-cm3c
• https://github.com/doyensec/safeurl/releases/tag/v0.2.4

Related advisories

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• GHSA-jqmf-mx4f-hfr6 — critical · PyPI/vibe-trading-ai
• CVE-2026-61559 — critical · npm/@zereight/mcp-gitlab
• CVE-2026-75856 — critical · crates.io/deepseek-tui
• CVE-2026-71428 — critical · PyPI/unstructured
• CVE-2026-64849 — critical · PyPI/mlflow
• CVE-2026-73080 — critical · Go/github.com/seaweedfs/seaweedfs
• CVE-2026-54725 — critical · Go/github.com/bank-vaults/vault-secrets-webhook

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