CVE-2026-70409 (GCVE-0-2026-70409)

Vulnerability from cvelistv5 – Published: 2026-09-01 14:51 – Updated: 2026-09-08 01:09
VLAI
Title
eldap does not bound the port component of a referral URL before integer conversion
Summary
Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP eldap allows a malicious or compromised LDAP server to degrade availability by returning a referral URL whose port component is a very long run of digits. eldap:parse_port/2 passes the port substring straight to list_to_integer/1 with no length bound. The surrounding try ... catch only rejects a value that fails to parse, so a syntactically valid port of up to roughly 1.26 million digits converts successfully and costs the caller hundreds of milliseconds of arbitrary-precision arithmetic per referral. The conversion function itself is documented to accept integers of any size, so bounding the input is the caller's responsibility. Reaching the flaw requires the application to pass a server-supplied referral to eldap:parse_ldap_url/1, which eldap never calls itself: referral strings are returned to the caller unparsed. This issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to eldap from 1.0.3 before 1.2.14.2, from 1.2.15 before 1.2.16.1, and from 1.3 before 1.3.1.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 17:52 UTC
CWE
  • CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
EEF CNA under the mitre root
CNA scorecard A 97/100 over 341 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Erlang OTP Affected: 17.0 , < 27.3.4.17 (otp)
Affected: 28.0 , < 28.5.0.6 (otp)
Affected: 29.0 , < 29.0.6 (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Erlang OTP Affected: 1.0.3 , < 1.2.14.2 (otp)
Affected: 1.2.15 , < 1.2.16.1 (otp)
Affected: 1.3 , < 1.3.1 (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Erlang OTP Affected: d8dbf15de4fa1a08b9a05e7d8e08fdb025fe1dc3 , < * (git)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Eric Meadows-Jönsson Jonatan Männchen / EEF Peter Ullrich José Valim Konrad Pietrzak / Ericsson
Show details on NVD website
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      "title": "eldap: eldap: Denial of Service via long LDAP referral URL port",
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      "title": "SUSE CVE CVE-2026-70409",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-70409.json",
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          "credits": [
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              "type": "finder",
              "value": "Eric Meadows-J\u00f6nsson"
            },
            {
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              "type": "finder",
              "value": "Jonatan M\u00e4nnchen / EEF"
            },
            {
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              "type": "finder",
              "value": "Peter Ullrich"
            },
            {
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              "type": "finder",
              "value": "Jos\u00e9 Valim"
            },
            {
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              "type": "remediation developer",
              "value": "Konrad Pietrzak / Ericsson"
            }
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                  "type": "text/html",
                  "value": "\u003cp\u003eImproper Validation of Specified Quantity in Input vulnerability in Erlang/OTP eldap allows a malicious or compromised LDAP server to degrade availability by returning a referral URL whose port component is a very long run of digits.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eeldap:parse_port/2\u003c/code\u003e passes the port substring straight to \u003ccode\u003elist_to_integer/1\u003c/code\u003e with no length bound. The surrounding \u003ccode\u003etry ... catch\u003c/code\u003e only rejects a value that fails to parse, so a syntactically valid port of up to roughly 1.26 million digits converts successfully and costs the caller hundreds of milliseconds of arbitrary-precision arithmetic per referral. The conversion function itself is documented to accept integers of any size, so bounding the input is the caller\u0027s responsibility. Reaching the flaw requires the application to pass a server-supplied referral to \u003ccode\u003eeldap:parse_ldap_url/1\u003c/code\u003e, which eldap never calls itself: referral strings are returned to the caller unparsed.\u003c/p\u003e\n\u003cp\u003eThis issue affects OTP from OTP\u0026nbsp;17.0 before OTP\u0026nbsp;27.3.4.17, from OTP\u0026nbsp;28.0 before OTP\u0026nbsp;28.5.0.6, and from OTP\u0026nbsp;29.0 before OTP\u0026nbsp;29.0.6, corresponding to eldap from 1.0.3 before 1.2.14.2, from 1.2.15 before 1.2.16.1, and from 1.3 before 1.3.1.\u003c/p\u003e"
                },
                {
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                  "value": "Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP eldap allows a malicious or compromised LDAP server to degrade availability by returning a referral URL whose port component is a very long run of digits.\n\n`eldap:parse_port/2` passes the port substring straight to `list_to_integer/1` with no length bound. The surrounding `try ... catch` only rejects a value that fails to parse, so a syntactically valid port of up to roughly 1.26 million digits converts successfully and costs the caller hundreds of milliseconds of arbitrary-precision arithmetic per referral. The conversion function itself is documented to accept integers of any size, so bounding the input is the caller\u0027s responsibility. Reaching the flaw requires the application to pass a server-supplied referral to `eldap:parse_ldap_url/1`, which eldap never calls itself: referral strings are returned to the caller unparsed.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.17, from OTP\u00a028.0 before OTP\u00a028.5.0.6, and from OTP\u00a029.0 before OTP\u00a029.0.6, corresponding to eldap from 1.0.3 before 1.2.14.2, from 1.2.15 before 1.2.16.1, and from 1.3 before 1.3.1."
                }
              ],
              "value": "Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP eldap allows a malicious or compromised LDAP server to degrade availability by returning a referral URL whose port component is a very long run of digits.\n\neldap:parse_port/2 passes the port substring straight to list_to_integer/1 with no length bound. The surrounding try ... catch only rejects a value that fails to parse, so a syntactically valid port of up to roughly 1.26 million digits converts successfully and costs the caller hundreds of milliseconds of arbitrary-precision arithmetic per referral. The conversion function itself is documented to accept integers of any size, so bounding the input is the caller\u0027s responsibility. Reaching the flaw requires the application to pass a server-supplied referral to eldap:parse_ldap_url/1, which eldap never calls itself: referral strings are returned to the caller unparsed.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.17, from OTP\u00a028.0 before OTP\u00a028.5.0.6, and from OTP\u00a029.0 before OTP\u00a029.0.6, corresponding to eldap from 1.0.3 before 1.2.14.2, from 1.2.15 before 1.2.16.1, and from 1.3 before 1.3.1."
            }
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                  "value": "CAPEC-231 Oversized Serialized Data Payloads"
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                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
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                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
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                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
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                "vulnerabilityResponseEffort": "NOT_DEFINED"
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                  "value": "GENERAL"
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          "problemTypes": [
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            "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "shortName": "EEF"
          },
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              "url": "https://github.com/erlang/otp/security/advisories/GHSA-9vgh-c8cm-m9p4"
            },
            {
              "tags": [
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              "url": "https://cna.erlef.org/cves/CVE-2026-70409.html"
            },
            {
              "tags": [
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              "url": "https://osv.dev/vulnerability/EEF-CVE-2026-70409"
            },
            {
              "tags": [
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              "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
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          "source": {
            "discovery": "EXTERNAL"
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          "title": "eldap does not bound the port component of a referral URL before integer conversion"
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        "datePublished": "2026-09-01T14:51:00.770Z",
        "dateReserved": "2026-08-09T16:30:01.576Z",
        "dateUpdated": "2026-09-08T01:09:09.018Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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Sightings

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