In Eclipse OpenJ9 versions up to 0.63.0, the JITServer component is vulnerable to denial of service due to improper boundary checks during protocol message and reply handling. An unauthenticated remote attacker or malicious JITServer can transmit malformed network payloads that cause out-of-bounds heap reads, immediately crashing the JITServer daemon or client JVM process via a segmentation fault (SIGSEGV).
CVE-2026-110938
“—” beside the score: it is equal to the CVSS score beside it.
This high-severity CVE scores 8.7 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.4% (35th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-107139 (ENISA EUVD) · GHSA-vj95-43qj-j5mf (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.
- CVSS v3
- 8.7
- EG Score
- 8.7HIGHmedium confidence
- EG Risk
- 54EG Risk 54/100
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)Severity87% × 45%Impact severity (EG Severity): CVSS 8.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.4% × 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 partial (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: An upstream fix is merged but not yet in a tagged release. 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 until it ships, then apply the release. - EPSS PROB
- 0.4%
- EPSS %ILE
- 35th
- 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 (8.7): severity, escalated by confirmed exploitation. This CVE's 8.7 is its impact severity (EG Severity), not escalated.
- EG Severity
- 8.7 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.the CNA's CVSS · CVSS v3.0 or v3.1
- EG Likelihood
- 0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-26). 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; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
An upstream fix is merged but not yet in a tagged release. 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 until it ships, then apply the release.
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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; 60 days if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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 21, 2026
Last Modified
October 26, 2026
Advisory Details (6)
Auto-updated Oct 21, 2026[Eclipse OpenJ9] JITServer: Multiple Denial of Service vulnerabilities via out-of-bounds heap reads during message and reply parsing (#407) · Issues · Eclipse Projects Security / cve-assignment · GitLab
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/407Eclipse OpenJ9 JITServer: pre-auth remote crash via OOB heap-read loop reached through a nested std::tuple field (ClassInfoTuple), distinct code path from #943/#944 (#947) · Issues · Eclipse Projects Security / vulnerability-reports · GitLab
https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/947Eclipse OpenJ9 JITServer: a malicious JITServer crashes the connecting client JVM via OOB heap-read loop in reply parsing (#946) · Issues · Eclipse Projects Security / vulnerability-reports · GitLab
https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/946Eclipse OpenJ9 JITServer: pre-auth remote crash via auto-sent CHTable-reply message (distinct code path from #943, same root cause) (#944) · Issues · Eclipse Projects Security / vulnerability-reports · GitLab
https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/944Eclipse OpenJ9 JITServer: pre-auth remote crash via OOB heap-read loop (#943) · Issues · Eclipse Projects Security / vulnerability-reports · GitLab
https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/943JITServer: prevent buffer overrun when dealing with vectors/tuples
Fix merged in eclipse-openj9/openj9 PR #25011 on 2026-10-20 — awaiting tagged release
https://github.com/eclipse-openj9/openj9/pull/25011Vendor Advisories for CVE-2026-110938(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 14× in last 7d / 14× 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.
- 2026-10-26 18:20 UTCEG score recompute
- 2026-10-26 18:19 UTCGHSA enrichmentGHSA-vj95-43qj-j5mf · GitHub severity HIGH
- 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-10-25 14:52 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-22 17:29 UTCEG score recompute
- 2026-10-22 17:29 UTCGHSA enrichmentGHSA-vj95-43qj-j5mf · GitHub severity HIGH
- 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-21 09:25 UTCEG score recompute
- 2026-10-21 08:33 UTCEG score recomputeFirst assessed: 8.7 HIGH
- 2026-10-21 08:30 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
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