CVE-2026-16340

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-10-08. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.0.0 through 11.0.0.2 could allow a remote attacker to execute arbitrary code due to an out-of-bounds write in the RFC2047 encoded-word parser.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
59
EG Risk 59/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation0% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

Published

October 8, 2026

Last Modified

October 9, 2026

Advisory Details (1)

Auto-updated Oct 9, 2026
No fix on record yet.
generic

Security Bulletin: IBM DataPower Gateway affected by multiple CVEs

https://www.ibm.com/support/pages/node/7289775

Vendor Advisories for CVE-2026-16340(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 31× in last 7d / 31× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-11 11:20 UTCEG score recompute
  2. 2026-10-11 11:20 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-10-11 07:08 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-11 02:55 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-10 22:41 UTCEG score recompute
  6. 2026-10-10 22:41 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-10-10 18:29 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-10-10 14:16 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  10. 2026-10-10 10:01 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-10 05:49 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-10-10 01:37 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-10-09 21:25 UTCEG score recompute
  14. 2026-10-09 21:25 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-09 17:13 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-09 12:52 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-09 08:39 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-09 04:25 UTCEG score recompute
  20. 2026-10-09 04:25 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-10-09 04:05 UTCEG score recompute
  22. 2026-10-09 04:05 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-10-09 01:12 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-08 21:00 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-10-08 18:37 UTCEG score recompute
Show 6 more
  1. 2026-10-08 18:37 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-10-08 18:00 UTCEG score recompute
  3. 2026-10-08 18:00 UTCGHSA enrichmentGHSA-46h5-qc35-fvcx · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-08 14:42 UTCEG score recompute
  5. 2026-10-08 13:19 UTCEG score recompute
  6. 2026-10-08 13:16 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16340?
CVE-2026-16340 is a critical vulnerability published on October 8, 2026. IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.0.0 through 11.0.0.2 could allow a remote attacker to execute arbitrary code due to an out-of-bounds write in the RFC2047 encoded-word parser.
When was the CVE record for CVE-2026-16340 published?
The CVE record for CVE-2026-16340 was published on October 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 9, 2026; the record at its source may have been updated since.
Is CVE-2026-16340 actively exploited?
CVE-2026-16340 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16340?
CVE-2026-16340 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-16340?
No fix for CVE-2026-16340 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-16340 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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