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Erlang/OTP eldap EUVDEUVD-2026-69247

| CVE-2026-70409 MEDIUM
Improper Validation of Specified Quantity in Input (CWE-1284)
2026-09-01 EEF
Otp Erlang
6.3
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
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/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
vuln.today AI
3.7 LOW

Requires attacker-controlled LDAP server AND application referral-chasing code path, yielding AC:H; impact is partial CPU stall, not full crash, so A:L.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
3.7 LOW
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (EEF).

CVSS VectorVendor: EEF

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Metadata Corrected
Sep 01, 2026 - 16:40 vuln.today
tag: Information Disclosure replaced by Denial Of Service
Source Code Evidence Fetched
Sep 01, 2026 - 15:50 vuln.today
Analysis Generated
Sep 01, 2026 - 15:50 vuln.today

DescriptionCVE.org

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.

AnalysisAI

CPU exhaustion in Erlang/OTP's eldap library allows a malicious or compromised LDAP server to degrade availability by returning referral URLs containing port components composed of up to ~1.26 million digits. The function eldap:parse_port/2 passes the port substring unbounded to Erlang's list_to_integer/1, which performs arbitrary-precision bignum arithmetic - consuming hundreds of milliseconds of CPU time per crafted referral. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires two simultaneous conditions: (1) the attacker must control or have compromised the LDAP server to which the target application connects - passive network interception of unencrypted LDAP traffic (port 389) would also satisfy this prerequisite; and (2) the application must explicitly pass server-supplied LDAP referral strings to `eldap:parse_ldap_url/1`. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.3 with VA:L (low availability impact) and AT:P (attack prerequisites present) accurately reflects constrained real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to Erlang/OTP 27.3.4.17, 28.5.0.6, or 29.0.6 or later, which contain the fix via commits aba0fe8c2d700bf4ac94607cf7f00e53bbe4042d and e3be1cfe9f6cedd0cd20d9905e05601dfb31c8aa. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Low
Product Status
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

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EUVD-2026-69247 vulnerability details – vuln.today
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