CVE-2026-77972

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Source
https://cve.org/CVERecord?id=CVE-2026-77972
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77972.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-77972
Aliases
Published
2026-09-15T15:37:49Z
Modified
2026-10-28T02:31:02Z
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

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 
{
    "cna_assigner": "EEF",
    "cwe_ids": [
        "CWE-367"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77972.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "0.1.0"
                        },
                        {
                            "fixed": "*"
                        },
                        {
                            "introduced": "feabbd0a13f83028ab24b71710526e9da9841f70"
                        },
                        {
                            "fixed": "*"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/slab/safeurl-elixir

Affected ranges

Type
GIT
Repo
https://github.com/slab/safeurl-elixir
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
feabbd0a13f83028ab24b71710526e9da9841f70
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "fixed": "feabbd0a13f83028ab24b71710526e9da9841f70"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77972.json"