Vulnerability in OCaml (CVE-2026-28364)
Summary
Vulnerability in OCaml (CVE-2026-28364). Confidential information can be exposed externally.
Original description
The description as published by the source.
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.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-28364 has been found in OCaml.
Confidential information can be exposed externally. CVSS score: 7.9/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "OCaml CVE-2026-28364" on the vendor's site.
CVE-2026-28364 (OCaml) — CWE-126 / CVSS v3 7.9
Attack vector: local / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-126) exists in OCaml.
Check the vendor advisory for the affected versions of OCaml.
Severity: High (CVSS 7.9/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'OCaml' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'OCaml' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
OCamlを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-28364 ocaml
- Ubuntu UBUNTU-CVE-2026-28364 ocaml
References
- advisory cve@mitre.org
- patch cve@mitre.org
- web nvd.nist.gov
- web access.redhat.com
- web bugzilla.redhat.com
- web security.access.redhat.com
- web github.com