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CVE-2018-9838

33
FAUCET Score

CVE-2018-9838 is an integer overflow vulnerability in the caml_ba_deserialize function of OCaml 4.06.0's standard library, affecting OCaml products. This critical vulnerability (CVSS 9.8) allows unauthenticated remote attackers to cause a denial of service or potentially execute arbitrary code by sending crafted marshalled data. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered significant community discussion, indicating awareness and potential interest.

Impacted Technologies

VendorProductVersion(s)CPE
4.06.0CPE matchmatch criteria
cpe:2.3:a:ocaml:ocaml:4.06.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.22%
Probability of exploitation in next 30 days
EPSS Percentile
89.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0422 is in the 83rd percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (2)

redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ocaml
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ocaml

Vendor Advisories (1)

redhatCVE-2018-9838Low

ocaml: Integer overflow in byterun/bigarray.c:caml_ba_deserialize() allows remote attackers to cause a denial of service or other unspecified impact

Apr 6, 2018

References

caml.inria.fr / mantis/view.php
Issue TrackingVendor Advisory
security.gentoo.org / glsa/202007-48