CVE-2026-70409: eldap does not bound the port component of a referral URL before integer conversion

unknownCVE-2026-70409

CSIRTS triage

vendor: Erlang/OTP product: eldapOther

What: The eldap module does not bound the port component of a referral URL before integer conversion, allowing integer overflow.
Who is affected: Applications using Erlang/OTP's eldap module to process LDAP referral URLs with arbitrary port values.
Urgency: Moderate urgency depending on exploitation; integer overflow could cause unexpected behavior in LDAP operations.
Action: Update Erlang/OTP to a patched version addressing CVE-2026-70409.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-09-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70409

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-704090.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-70409	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for eldap does not

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-70409: Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP eldap allows a …nvd · 2026-09-01