High severity · published Sep 10, 2026
CVE-2026-89087
The cstruct package before 6.3.0 for OCaml mishandles indexes
7.3
CVSS
0.3%
EPSS
No
On KEV
Description
The cstruct package before 6.3.0 for OCaml mishandles indexes.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CS
cstruct · OCaml
before 6.3.0 · source: vendor