EEF-CVE-2026-77972
- Source
- https://cna.erlef.org/osv/EEF-CVE-2026-77972.html
- Import Source
- https://cna.erlef.org/osv/EEF-CVE-2026-77972.json
- JSON Data
- https://api.osv.dev/v1/vulns/EEF-CVE-2026-77972
- Aliases
-
- CVE-2026-77972
- Published
- 2026-09-15T15:37:49Z
- Modified
- 2026-09-15T15:45:03Z
- Severity
-
- 9.0 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N CVSS Calculator
- Summary
- safeurl validated address is not bound to the request, allowing DNS rebinding
- Details
-
Summary
Time-of-check Time-of-use (TOCTOU) Race Condition in Slab safeurl allows an attacker who controls a hostname's DNS responses to reach internal network destinations that validation rejected.
Validation returns a verdict and not the address it approved, so the HTTP clients the library ships receive the original hostname and resolve it a second time when the request is made. An attacker who controls the authoritative DNS for a name can answer the first lookup with a permitted address and the second with a blocked one, and the request then reaches a destination validation never approved. The same window opens without an attacker whenever a name legitimately resolves to different addresses across lookups, such as short record lifetimes or rotation between several addresses.
This issue affects safeurl: from 0.1.0 onward.
- Database specific
{ "capec_ids": [ "CAPEC-664" ], "cpe_ids": [ "cpe:2.3:a:slab:safeurl:*:*:*:*:*:*:*:*" ], "cwe_ids": [ "CWE-367" ] }- References
- Credits
-
-
- Jonatan Männchen / EEF - REPORTER
-
- Jonatan Männchen / EEF - COORDINATOR
-
Affected packages
Hex / safeurl
Package
- Name
- safeurl
- Purl
- pkg:hex/safeurl