CVE-2026-15564

HIGHPre-NVD 7.47.4
EchelonGraph scoreHIGH confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-10-29. A secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-112633 (ENISA EUVD) · GHSA-89hx-fmwj-cww5 (GitHub Security Advisories)Source: ENISA EUVD

7.4EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Wildfly's IIOP listener may permit deserialization of input streams before authentication is performed. An attacker who can gain access to the IIOP port may be able to construct and send malicious objects and achieve deserialization, if the target EJB allows untyped method parameters, and depending on the potential gadget chains available in the running classpath.

CVSS v3
7.4
EG Score
7.4HIGHhigh confidence
EG Risk
33
EG Risk 33/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity74% × 45%
Impact severity (EG Severity): CVSS 7.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
3rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.4): severity, escalated by confirmed exploitation. This CVE's 7.4 is its impact severity (EG Severity), not escalated.

EG Severity
7.4 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

October 29, 2026

Last Modified

November 6, 2026

Advisory Details (2)

Auto-updated Oct 29, 2026
Patch available. Sources: redhat.
Red Hat

Bug Access Denied

https://bugzilla.redhat.com/show_bug.cgi?id=2478005
Red HatMentions a patch (unverified)

CVE-2026-15564 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-15564

Vendor Advisories for CVE-2026-15564(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 / EcosystemFix (by version range) / PatchReleasedSource
redhatwildfly-iiop-openjdk2026-11-06redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 23× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-13 04:45 UTCEchelonGraph re-scored
  2. 2026-11-13 04:45 UTCVendor advisory
  3. 2026-11-13 04:45 UTCGHSA enrichmentGHSA-89hx-fmwj-cww5 · GitHub severity HIGH · GitHub CVSS 7.4
  4. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-11-10 16:42 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-11-06 18:27 UTCEchelonGraph re-scored
  11. 2026-11-06 18:27 UTCGHSA enrichmentGHSA-89hx-fmwj-cww5 · GitHub severity HIGH · GitHub CVSS 7.4
  12. 2026-11-06 17:33 UTCEchelonGraph re-scored
  13. 2026-11-06 17:33 UTCGHSA enrichmentGHSA-89hx-fmwj-cww5 · GitHub severity HIGH · GitHub CVSS 7.4
  14. 2026-11-06 16:36 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  15. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-11-05 04:45 UTCEchelonGraph re-scored
  17. 2026-11-05 04:45 UTCGHSA enrichmentGHSA-89hx-fmwj-cww5 · GitHub severity HIGH · GitHub CVSS 7.4
  18. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-11-03 16:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  20. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  22. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  23. 2026-10-29 18:27 UTCEchelonGraph re-scored
  24. 2026-10-29 18:27 UTCGHSA enrichmentGHSA-89hx-fmwj-cww5 · GitHub severity HIGH · GitHub CVSS 7.4
  25. 2026-10-29 17:27 UTCEchelonGraph re-scored
Show 6 more
  1. 2026-10-29 17:27 UTCGHSA enrichmentGHSA-89hx-fmwj-cww5 · GitHub severity HIGH · GitHub CVSS 7.4
  2. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  3. 2026-10-29 07:01 UTCENISA EUVD ID recordedEUVD-2026-112633 · Source: ENISA EUVD
  4. 2026-10-29 06:26 UTCEchelonGraph re-scored
  5. 2026-10-29 06:13 UTCEchelonGraph re-scoredFirst assessed: 7.4 HIGH
  6. 2026-10-29 06:13 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-15564?
CVE-2026-15564 is a high-severity vulnerability; its CVE record was published on October 29, 2026. Wildfly's IIOP listener may permit deserialization of input streams before authentication is performed. An attacker who can gain access to the IIOP port may be able to construct and send malicious objects and achieve deserialization, if the target EJB allows untyped method parameters, and depending…
When was CVE-2026-15564 made public?
CVE-2026-15564 was made public on October 27, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on October 29, 2026. EchelonGraph's copy of the record carries a last-modified date of November 6, 2026; the record at its source may have been updated since.
Is CVE-2026-15564 actively exploited?
CVE-2026-15564 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15564?
CVE-2026-15564 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15564?
A fix for CVE-2026-15564 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-15564 are linked in the Vendor Advisories panel on this page.

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