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CVE-2026-70409· NVD / CVE Program· CNA EEF

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

Noroxi assessment

Priority: Monitor (action score 25/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.57% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Erlang OTP 1.2.14.2, 1.2.16.1, 1.3.1; azl3 erlang 26.2.5.21-4 on Azure Linux 3.0 26.2.5.21-6; azl3 erlang 26.2.5.21-6 on Azure Linux 3.0 26.2.5.21-6.

Low priority for now. Upgrade to Erlang OTP 1.2.14.2, 1.2.16.1, 1.3.1; azl3 erlang 26.2.5.21-4 on Azure Linux 3.0 26.2.5.21-6; azl3 erlang 26.2.5.21-6 on Azure Linux 3.0 26.2.5.21-6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.3 · v4.0—No exploit Fix available
Published
Sep 1, 2026
Updated
Sep 8, 2026
EPSS
0.5% · 46th percentile

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
25 / 40 · 6.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · EEF
6.3
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-70409

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (EEF). Independent of NVD's CPE analysis and usually ahead of it.

  • Erlang OTP

    • 17.0 and later · before 27.3.4.17affected · otp
    • 28.0 and later · before 28.5.0.6affected · otp
    • 29.0 and later · before 29.0.6affected · otp
    • 1.0.3 and later · before 1.2.14.2affected · otp
    • 1.2.15 and later · before 1.2.16.1affected · otp
    • 1.3 and later · before 1.3.1affected · otp
    • d8dbf15de4fa1a08b9a05e7d8e08fdb025fe1dc3 and lateraffected · gitfixed in aba0fe8c2d700bf4ac94607cf7f00e53bbe4042d, e3be1cfe9f6cedd0cd20d9905e05601dfb31c8aa

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12erlangfrom 0—
Debian:13erlangbefore 1:27.3.4.1+dfsg-1+deb13u41:27.3.4.1+dfsg-1+deb13u4
Debian:14erlangbefore 1:29.0.6+dfsg-11:29.0.6+dfsg-1
Red Hat:hummingbird:1erlang27before 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-asn1before 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-common_testbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-compilerbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-cryptobefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-debuggerbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-dialyzerbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-diameterbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-edocbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-eldapbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-erl_interfacebefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-ertsbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-etbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-eunitbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-examplesbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-ftpbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-gdb-toolsbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-inetsbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-jinterfacebefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-kernelbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-megacobefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1

+18

Same product

erlang: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-89422TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension
    37Monitor
  • CVE-2026-74835inets,httpd: Memory Exhaustion via Unenforced max_body_size During Chunked Body Reception
    34Monitor
  • CVE-2026-71380httpd applies no timeout while receiving a request body, parking a worker on a stalled client
    34Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-70399Sep 1, 2026 · httpd does not enforce the documented default max_clients connection limit
    34Monitor
  • ← EarlierCVE-2026-70405Sep 1, 2026 · snmp BER INTEGER decoder applies no size limit to attacker-supplied integer fields
    25Monitor
  • Later →CVE-2026-71562Sep 1, 2026 · httpc does not bound server-supplied numeric header values before integer conversion
    25Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Erlang OTP1.2.14.2Vendor (CNA)
Erlang OTP1.2.16.1Vendor (CNA)
Erlang OTP1.3.1Vendor (CNA)
Erlang OTP27.3.4.17Vendor (CNA)
Erlang OTP28.5.0.6Vendor (CNA)
Erlang OTP29.0.6Vendor (CNA)
Erlang OTPaba0fe8c2d700bf4ac94607cf7f00e53bbe4042dVendor (CNA)
Erlang OTPe3be1cfe9f6cedd0cd20d9905e05601dfb31c8aaVendor (CNA)
azl3 erlang 26.2.5.21-4 on Azure Linux 3.026.2.5.21-6Microsoft (MSRC)
azl3 erlang 26.2.5.21-6 on Azure Linux 3.026.2.5.21-6Microsoft (MSRC)
debian:erlang1:27.3.4.1+dfsg-1+deb13u4 · Debian:13Package registry (OSV)
debian:erlang1:29.0.6+dfsg-1 · Debian:14Package registry (OSV)
red hat:erlang270:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-asn10:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-common_test0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-compiler0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-crypto0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-debugger0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-dialyzer0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-diameter0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-edoc0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-eldap0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-erl_interface0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-erts0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-596960 days aparturi_string does not bound the port component of a URI before integer conversion
    27Monitor
  • CVE-2026-704050 days apartsnmp BER INTEGER decoder applies no size limit to attacker-supplied integer fields
    25Monitor
  • CVE-2026-715620 days aparthttpc does not bound server-supplied numeric header values before integer conversion
    25Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-1284 · Improper Validation of Specified Quantity in Input

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records