What is CVE-2015-8869?

CVE-2015-8869 is a critical-severity vulnerability in Ocaml, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.1/10. Published 2016-06-13.

How severe is CVE-2015-8869?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2015-8869 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Ocaml

CVE-2015-8869

OCaml before 4.03.0 does not properly handle sign extensions, which allows remote attackers to conduct buffer overflow attacks or obtain sensitive information as demonstrated by a long string to the String.copy function.

Vulnerability class: Buffer Overflow

Published 2016-06-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.053 (92.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.053 · newest: 0.053 · change: 0.000

Affected products

Ocaml
Fedoraproject Fedora — versions 24
openSUSE — versions 13.2

Weakness classification (CWE)

Public proof-of-concept exploits

andir/nixos-issue-db-example

References

access.redhat.com/errata/RHSA-2016:1296 (vendor-advisory)
rhn.redhat.com/errata/RHSA-2016-2576.html (vendor-advisory)
www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
security.gentoo.org/glsa/201702-15 (vendor-advisory)
lists.opensuse.org/opensuse-updates/2016-09/msg00037.html (vendor-advisory)
www.openwall.com/lists/oss-security/2016/04/29/6 (mailing-list)
lists.fedoraproject.org/pipermail/package-announce/2016-May/184507.html (vendor-advisory)
rhn.redhat.com/errata/RHSA-2017-0564.html (vendor-advisory)
www.securityfocus.com/bid/89318 (vdb-entry)
github.com/ocaml/ocaml/commit/659615c7b100a89eafe6253e7a5b9d84d0e8df74

Frequently asked questions

What is CVE-2015-8869?: CVE-2015-8869 is a critical-severity vulnerability in Ocaml, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.1/10. Published 2016-06-13.
How severe is CVE-2015-8869?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2015-8869 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.