CVE-2026-54452

MEDIUMPre-NVD 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: —CVSS: —Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

safeurl is Missing IPv6 CIDR Ranges in Blocklist

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.

CVSS v3
—
EG Score
0.0(none)
EPSS
—
KEV
Not listed

Published

July 15, 2026

Last Modified

July 15, 2026

Vendor Advisories for CVE-2026-54452(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 1× in last 7d / 1× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 22:19 UTCEG score recompute

Frequently asked(3)

What is CVE-2026-54452?
CVE-2026-54452 is a medium vulnerability published on July 15, 2026. safeurl is Missing IPv6 CIDR Ranges in Blocklist 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)…
When was CVE-2026-54452 disclosed?
CVE-2026-54452 was first published in the National Vulnerability Database on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
How do I remediate CVE-2026-54452?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54452, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-54452

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