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Fencer Vulns
medium 5.9

CVE-2026-34353 json

Bigarray.reshape integer overflow

published 2026-03-27 7 mo ago modified 2026-11-06 2 d ago also EUVD-2026-16555 , OSEC-2026-04

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

In OCaml through 4.14.3, Bigarray.reshape allows an integer overflow, and resultant reading of arbitrary memory, when untrusted data is processed.

Patch / fix

  • opam ocaml 4.14.4
  • ocaml Debian 14, Debian 13 5.2.0-1

debian advisories DEBIAN-CVE-2026-34353

  • ocaml openSUSE Tumbleweed 4.14.4-1.1

opensuse advisories openSUSE-SU-2026:11136-1

  • ocaml Alpine 3.24 4.14.4-r0

alpine advisories ALPINE-CVE-2026-34353

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ocaml Azure Linux 3.0 5.1.1-1

azure linux advisories AZL-81104

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-34353 updated cvss 5.9

ocaml: OCaml: Information disclosure via integer overflow in Bigarray.reshape

  • Red Hat Enterprise Linux 6 ocaml, ocaml-x11, ocaml-emacs, ocaml-camlp4, ocaml-labltk, ocaml-source, +2 more Red Hat Enterprise Linux 7 ocaml, ocaml-x11, ocaml-emacs, ocaml-camlp4, ocaml-labltk, ocaml-source, +3 more Red Hat Enterprise Linux 8 ocaml, ocaml-camlp4, ocaml-labltk, ocaml-runtime, ocaml-ocamldoc, ocaml-compiler-libs Red Hat Enterprise Linux 9 ocaml, ocaml-labltk, ocaml-source, ocaml-runtime, ocaml-ocamldoc, ocaml-compiler-libs Red Hat Enterprise Linux 10 ocaml
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
NVD 3.1 5.1 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
opam ocaml
<4.14.4
4.14.4

Affected products

  • OCaml OCaml

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.