CVE-2026-70409

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 64% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
6.3
EG Score
6.3(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 8, 2026

Advisory Details (6)

Auto-updated Sep 1, 2026
Patch available. Sources: github, github_commit.
github_commit

commit e3be1cfe9f6c (erlang/otp)

Fix landed in erlang/otp commit e3be1cfe9f6c — awaiting tagged release

https://github.com/erlang/otp/commit/e3be1cfe9f6cedd0cd20d9905e05601dfb31c8aa
github_commit

commit aba0fe8c2d70 (erlang/otp)

Fix landed in erlang/otp commit aba0fe8c2d70 — awaiting tagged release

https://github.com/erlang/otp/commit/aba0fe8c2d700bf4ac94607cf7f00e53bbe4042d
generic

Versions — Erlang System Documentation v29.0.6

https://www.erlang.org/doc/system/versions.html#order-of-versions
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/EEF-CVE-2026-70409
generic

CVE-2026-70409

https://cna.erlef.org/cves/CVE-2026-70409.html
github Patch Available

eldap: Denial-of-Service enabled by Unbounded Integer Conversion · Advisory · erlang/otp · GitHub

https://github.com/erlang/otp/security/advisories/GHSA-9vgh-c8cm-m9p4

Vendor Advisories for CVE-2026-70409(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhaterlang27-main-27.3.4.17-0.1.hum12026-09-02redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
erlang1:25.2.3+dfsg-1 ... 1:29.0~rc3+dfsg-4 (79 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
erlang1:27.3.4.1+dfsg-1 ... 1:29.0~rc3+dfsg-4 (40 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
erlang1:27.3.4.1+dfsg-1 ... 1:29.0~rc3+dfsg-4 (37 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 52× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 19:57 UTCEG score recompute
  2. 2026-09-18 19:57 UTCVendor advisory
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-17 20:44 UTCEG score recompute
  5. 2026-09-17 20:44 UTCVendor advisory
  6. 2026-09-16 18:39 UTCEG score recompute
  7. 2026-09-16 18:39 UTCVendor advisory
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 19:12 UTCEG score recompute
  11. 2026-09-15 19:12 UTCVendor advisory
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-14 19:59 UTCVendor advisory
  14. 2026-09-13 20:46 UTCEG score recompute
  15. 2026-09-13 20:46 UTCVendor advisory
  16. 2026-09-12 21:33 UTCEG score recompute
  17. 2026-09-12 21:33 UTCVendor advisory
  18. 2026-09-12 15:02 UTCEPSS rescore
  19. 2026-09-11 22:20 UTCEG score recompute
  20. 2026-09-11 22:20 UTCVendor advisory
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-10 23:07 UTCEG score recompute
  23. 2026-09-10 23:07 UTCVendor advisory
  24. 2026-09-10 09:35 UTCEPSS rescore
  25. 2026-09-09 23:53 UTCVendor advisory
Show 27 more
  1. 2026-09-09 00:40 UTCEG score recompute
  2. 2026-09-09 00:40 UTCVendor advisory
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-08 01:28 UTCEG score recompute
  5. 2026-09-08 01:28 UTCVendor advisory
  6. 2026-09-08 01:15 UTCEG score recompute
  7. 2026-09-08 01:15 UTCVendor advisory
  8. 2026-09-07 16:38 UTCEG score recompute
  9. 2026-09-07 16:38 UTCVendor advisory
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 17:26 UTCEG score recompute
  12. 2026-09-06 17:26 UTCVendor advisory
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-05 18:13 UTCEG score recompute
  15. 2026-09-05 18:13 UTCVendor advisory
  16. 2026-09-05 15:31 UTCEPSS rescore
  17. 2026-09-04 19:00 UTCEG score recompute
  18. 2026-09-04 19:00 UTCVendor advisory
  19. 2026-09-04 05:07 UTCEPSS rescore
  20. 2026-09-03 19:47 UTCVendor advisory
  21. 2026-09-02 20:33 UTCEG score recompute
  22. 2026-09-02 14:12 UTCEPSS rescore
  23. 2026-09-01 18:25 UTCEG score recompute
  24. 2026-09-01 18:04 UTCEG score recompute
  25. 2026-09-01 15:38 UTCEG score recompute
  26. 2026-09-01 14:55 UTCEG score recompute
  27. 2026-09-01 14:53 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-70409?
CVE-2026-70409 is a medium vulnerability published on September 1, 2026. 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…
When was CVE-2026-70409 disclosed?
CVE-2026-70409 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70409 actively exploited?
CVE-2026-70409 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 63.8% of all scored CVEs.
What is the CVSS score of CVE-2026-70409?
CVE-2026-70409 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-70409?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70409, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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