How severe is CVE-2018-9838?

CVE-2018-9838 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-9838 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-9838?

CVE-2018-9838 affects Ocaml. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-9838?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-9838 published?

CVE-2018-9838 was published on 2018-04-06 and last updated on 2026-06-17.

CVE-2018-9838

CVE-2018-9838 is a critical-severity vulnerability in Ocaml with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Ocaml
Published: 2018-04-06
Last modified: 2026-06-17

Description

The caml_ba_deserialize function in byterun/bigarray.c in the standard library in OCaml 4.06.0 has an integer overflow which, in situations where marshalled data is accepted from an untrusted source, allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via a crafted object.

Frequently asked questions

What is CVE-2018-9838?: The caml_ba_deserialize function in byterun/bigarray.c in the standard library in OCaml 4.06.0 has an integer overflow which, in situations where marshalled data is accepted from an untrusted source, allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via a crafted object.
How severe is CVE-2018-9838?: CVE-2018-9838 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-9838 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-9838?: CVE-2018-9838 affects Ocaml. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-9838?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-9838 published?: CVE-2018-9838 was published on 2018-04-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ocaml:ocaml:4.06.0:*:*:*:*:*:*:*

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