Is there a public exploit for CVE-2026-70409?

No public exploit for CVE-2026-70409 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-70409?

CVE-2026-70409 scores CVSS 6.3 (v4.0), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.58%.

What does CVE-2026-70409 affect?

CVE-2026-70409 affects erlang otp.

6.3 Medium

Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP eldap allows a malicious or compromised LDAP server to…

CVE-2026-70409

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:parseport/2 passes the port substring straight to listtointeger/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:parseldapurl/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, OTP 28.5.0.6, and OTP 29.0.6, corresponding to eldap from 1.0.3 before 1.2.14.2, 1.2.16.1, and 1.3.1.

Assessment

CVSS: 6.3 (v4.0)
Severity: Medium
EPSS: 0.58% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 1 September 2026
Last updated: 11 November 2026
Affected: erlang · otp
Assigner: EEF

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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