CVE-2026-28364

HIGHNVD 7.87.9▲
EchelonGraph scoreMEDIUM confidence

Score 7.9 from GitHub Security Advisory (severity: HIGH) published 2026-02-27. NVD baseline CVSS 7.8; sources differ by 0.1.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

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

In OCaml before 4.14.3 and 5.x before 5.4.1, a buffer over-read in Marshal deserialization (runtime/intern.c) enables remote code execution through a multi-phase attack chain. The vulnerability stems from missing bounds validation in the readblock() function, which performs unbounded memcpy() operations using attacker-controlled lengths from crafted Marshal data.

CVSS v3
7.8
EG Score
7.9(medium)
EPSS
11.2%
KEV
Not listed

Published

February 27, 2026

Last Modified

June 30, 2026

Advisory Details (5)

Auto-updated Jul 1, 2026
Patch available. Sources: redhat.
redhat

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28364.json
redhat

2443348 – (CVE-2026-28364) CVE-2026-28364 ocaml: OCaml: Remote code execution via buffer over-read in Marshal deserialization

https://bugzilla.redhat.com/show_bug.cgi?id=2443348
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-28364
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/OSEC-2026-01
generic

security-advisories/2026/OSEC-2026-01.json at generated-osv · ocaml/security-advisories · GitHub

https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-01.json

Vendor Advisories for CVE-2026-28364(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.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 8× in last 7d / 17× 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. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-01 15:06 UTCEPSS rescore
  12. 2026-06-30 23:22 UTCEPSS rescore
  13. 2026-06-30 23:22 UTCEPSS rescore
  14. 2026-06-30 04:40 UTCEG score recompute
  15. 2026-06-30 04:40 UTCVendor advisory
  16. 2026-06-30 04:40 UTCGHSA enrichment
  17. 2026-06-30 04:31 UTCNVD updateCVSS v3 → 7.8

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-28364?
CVE-2026-28364 is a high vulnerability published on February 27, 2026. In OCaml before 4.14.3 and 5.x before 5.4.1, a buffer over-read in Marshal deserialization (runtime/intern.c) enables remote code execution through a multi-phase attack chain. The vulnerability stems from missing bounds validation in the readblock() function, which performs unbounded memcpy()…
When was CVE-2026-28364 disclosed?
CVE-2026-28364 was first published in the National Vulnerability Database on February 27, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28364 actively exploited?
CVE-2026-28364 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-28364?
CVE-2026-28364 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.9.
How do I remediate CVE-2026-28364?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28364, 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

Explore the affected products and dependency analysis for CVE-2026-28364

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