eldap does not bound the port component of a referral URL before integer conversion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-70409
StatePUBLISHED
AssignerEEF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-01 15:17:24 UTC
Updated2026-09-01 21:15:00 UTC
DescriptionImproper 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.

Risk And Classification

Primary CVSS: v4.0 6.3 MEDIUM from 6b3ad84c-e1a6-4bf7-a703-f496b71e49db

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.004230000 probability, percentile 0.353480000 (date 2026-09-03)

Problem Types: CWE-1284 | CWE-1284 CWE-1284 Improper Validation of Specified Quantity in Input

VersionSourceTypeScoreSeverityVector
4.06b3ad84c-e1a6-4bf7-a703-f496b71e49dbSecondary6.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS6.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Erlang OTP affected 17.0 27.3.4.17 otp Not specified
CNA Erlang OTP affected 28.0 28.5.0.6 otp Not specified
CNA Erlang OTP affected 29.0 29.0.6 otp Not specified
CNA Erlang OTP affected 1.0.3 1.2.14.2 otp Not specified
CNA Erlang OTP affected 1.2.15 1.2.16.1 otp Not specified
CNA Erlang OTP affected 1.3 1.3.1 otp Not specified
CNA Erlang OTP affected d8dbf15de4fa1a08b9a05e7d8e08fdb025fe1dc3 * git Not specified

References

ReferenceSourceLinkTags
cna.erlef.org/cves/CVE-2026-70409.html 6b3ad84c-e1a6-4bf7-a703-f496b71e49db cna.erlef.org
github.com/erlang/otp/commit/e3be1cfe9f6cedd0cd20d9905e05601dfb31c8aa 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com
www.erlang.org/doc/system/versions.html 6b3ad84c-e1a6-4bf7-a703-f496b71e49db www.erlang.org
osv.dev/vulnerability/EEF-CVE-2026-70409 6b3ad84c-e1a6-4bf7-a703-f496b71e49db osv.dev
github.com/erlang/otp/commit/aba0fe8c2d700bf4ac94607cf7f00e53bbe4042d 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com
github.com/erlang/otp/security/advisories/GHSA-9vgh-c8cm-m9p4 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Eric Meadows-Jönsson (en)

CNA: Jonatan Männchen / EEF (en)

CNA: Peter Ullrich (en)

CNA: José Valim (en)

CNA: Konrad Pietrzak / Ericsson (en)

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