🛡️ CVE-2026-54452 — safeurl

⚪ Unknown ✅ No Known Exploit CWE-918 OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2026-54452 is classified as CWE-918: Server-Side Request Forgery (SSRF). The server fetches a URL supplied by the caller, which can be pointed at internal systems it alone can reach.

Affected software

CVE-2026-54452 is recorded against 1 package.

  • github.com/doyensec/safeurl

Timeline and source

Published on 15 July 2026 and last revised on 21 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE CWE-918
Public Exploit ✅ No
Source OSV
Published 2026-07-15
Updated 2026-08-12
Modified 2026-07-21
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/doyensec/safeurl — —

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