CVE-2026-70409
Description
A flaw was found in eldap, a component of Erlang/OTP. A malicious or compromised Lightweight Directory Access Protocol (LDAP) server could exploit this vulnerability by returning a referral Uniform Resource Locator (URL) with an excessively long port number. This unbounded port component is then processed by the eldap:parse_port/2 function, leading to a significant increase in processing time due to arbitrary-precision arithmetic. This can degrade the availability of the affected system, resulting in a Denial of Service (DoS).
Mitigation
To mitigate this issue, ensure that applications utilizing the eldap component are configured to connect only to trusted LDAP servers. Additionally, if possible, configure applications to disable or restrict the processing of LDAP referral URLs from untrusted sources, as the vulnerability requires an application to explicitly pass server-supplied referral strings to eldap for parsing.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | Low | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Understanding the Weakness (CWE)
Other,Integrity,Availability
Technical Impact: Varies by Context; DoS: Resource Consumption (CPU); Modify Memory; Read Memory
When the quantity is not properly validated, then attackers can specify malicious quantities to cause excessive resource allocation, trigger unexpected failures, enable buffer overflows, etc.
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