CVE-2026-28364
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.9epss 0.2%
exploitation probability
0.2%top 89% of all CVEs
observed exploitation
nono source reports it
In OCaml before 4.14.3 and 5.x before 5.4.1, a buffer over-read in Marshal deserialization (runtime/intern.c) enables remote code execution through a multi-phase attack chain. The vulnerability stems from missing bounds validation in the readblock() function, which performs unbounded memcpy() operations using attacker-controlled lengths from crafted Marshal data.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Affected products
OCaml · OCamlReferences
https://access.redhat.com/security/cve/CVE-2026-28364https://bugzilla.redhat.com/show_bug.cgi?id=2443348https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-01.jsonhttps://osv.dev/vulnerability/OSEC-2026-01https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28364.json