{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77972", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-08-24T15:45:02.127Z", "datePublished": "2026-09-15T15:37:49.948Z", "dateUpdated": "2026-09-15T15:37:49.948Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:slab:safeurl:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.SafeURL'", "'Elixir.SafeURL.HTTPoison'", "'Elixir.SafeURL.TeslaMiddleware'"], "packageName": "safeurl", "packageURL": "pkg:hex/safeurl", "product": "safeurl", "programFiles": ["lib/safeurl/safeurl.ex", "lib/safeurl/httpoison.ex", "lib/safeurl/tesla_middleware.ex"], "programRoutines": [{"name": "'Elixir.SafeURL':validate/2"}, {"name": "'Elixir.SafeURL.HTTPoison':get/3"}, {"name": "'Elixir.SafeURL.TeslaMiddleware':call/3"}], "repo": "https://github.com/slab/safeurl-elixir", "vendor": "Slab", "versions": [{"lessThan": "*", "status": "affected", "version": "0.1.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:slab:safeurl:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.SafeURL'", "'Elixir.SafeURL.HTTPoison'", "'Elixir.SafeURL.TeslaMiddleware'"], "packageName": "slab/safeurl-elixir", "packageURL": "pkg:github/slab/safeurl-elixir", "product": "safeurl", "programFiles": ["lib/safeurl/safeurl.ex", "lib/safeurl/httpoison.ex", "lib/safeurl/tesla_middleware.ex"], "programRoutines": [{"name": "'Elixir.SafeURL':validate/2"}, {"name": "'Elixir.SafeURL.HTTPoison':get/3"}, {"name": "'Elixir.SafeURL.TeslaMiddleware':call/3"}], "repo": "https://github.com/slab/safeurl-elixir", "vendor": "Slab", "versions": [{"lessThan": "*", "status": "affected", "version": "feabbd0a13f83028ab24b71710526e9da9841f70", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:slab:safeurl:*:*:*:*:*:*:*:*", "versionStartIncluding": "0.1.0", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "reporter", "value": "Jonatan M\u00e4nnchen / EEF"}, {"lang": "en", "type": "coordinator", "value": "Jonatan M\u00e4nnchen / EEF"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>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.</p>\n<p>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.</p>\n<p>This issue affects safeurl: from 0.1.0 onward.</p>"}, {"base64": false, "type": "text/markdown", "value": "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.\n\nValidation 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.\n\nThis issue affects safeurl: from 0.1.0 onward."}], "value": "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.\n\nValidation 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.\n\nThis issue affects safeurl: from 0.1.0 onward."}], "impacts": [{"capecId": "CAPEC-664", "descriptions": [{"lang": "en", "value": "CAPEC-664 Server Side Request Forgery"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 9, "baseSeverity": "CRITICAL", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-367", "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-15T15:37:49.948Z"}, "references": [{"name": "EEF CNA record for CVE-2026-77972", "tags": ["related", "third-party-advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-77972.html"}, {"name": "OSV record EEF-CVE-2026-77972", "tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-77972"}, {"name": "Introducing commit feabbd0 in slab/safeurl-elixir", "tags": ["related"], "url": "https://github.com/slab/safeurl-elixir/commit/feabbd0a13f83028ab24b71710526e9da9841f70"}], "source": {"discovery": "EXTERNAL"}, "title": "safeurl validated address is not bound to the request, allowing DNS rebinding"}}}

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