Security readout for executives and security teams
Plain-English summary
OCaml 4.06.0 had an integer overflow in Bigarray deserialization. If an application accepts OCaml marshalled data from an untrusted source, a crafted object could corrupt memory, causing a crash or possibly arbitrary code execution. Risk is concentrated in services that deserialize untrusted OCaml data.
Executive priority
Prioritize this for OCaml-backed systems that process external serialized data. Broader urgency depends on whether OCaml 4.06.0 or affected downstream packages are present and reachable.
Technical view
The issue is in caml_ba_deserialize in byterun/bigarray.c, part of the OCaml standard library. The CVE describes an integer overflow during Bigarray unmarshalling that can lead to memory corruption when hostile marshalled input is processed.
Likely exposure
Likely exposure is limited to OCaml 4.06.0 environments or downstream packages using affected runtime code, especially networked services, APIs, or tooling that accept marshalled OCaml objects from untrusted sources.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. It states remote attackers could trigger denial of service or possibly code execution only where untrusted marshalled data is accepted.
Researcher notes
Evidence identifies the vulnerable function and condition, but the bundle lacks CVSS, CWE, exploit confirmation, and explicit fixed versions. Treat remediation guidance as vendor-advisory driven rather than assuming a specific patch level.
Mitigation direction
- Identify OCaml runtime versions in production and build images.
- Prioritize systems that deserialize OCaml marshalled data from external inputs.
- Review OCaml and distribution advisories for fixed package versions.
- Apply vendor or distribution updates where applicable.
- Avoid accepting untrusted marshalled OCaml data where feasible.
Validation and detection
- Inventory services built with OCaml 4.06.0 or related packages.
- Search code for OCaml Marshal or Bigarray deserialization paths.
- Confirm whether deserialized data can originate outside trust boundaries.
- Check Gentoo or vendor package status against GLSA-202007-48.
- Document systems with no untrusted marshalled input as lower exposure.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-9838 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://caml.inria.fr/mantis/view.php?id=7765CVE reference · x_refsource_MISC
- GLSA-202007-48CVE reference · vendor-advisory, x_refsource_GENTOO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.