EUVD-2026-75709
GHSA-32j6-362j-46jc
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Library is network-reachable via calling applications, requires no auth; partial CIA impact matches index mishandling with potential OOB read and write.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
The cstruct package before 6.3.0 for OCaml mishandles indexes.
AnalysisAI
Index mishandling in the OCaml cstruct library before 6.3.0 allows network-reachable attackers to trigger partial confidentiality, integrity, and availability impacts via crafted binary data passed to affected parsing routines. cstruct is a low-level binary buffer manipulation library used widely in OCaml network stacks and the MirageOS unikernel ecosystem; improper index handling can bypass the library's internal bounds logic, exposing adjacent memory or corrupting buffer state. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that: (1) the target application uses a version of cstruct before 6.3.0; (2) the application exposes a code path that passes attacker-controlled binary data directly to cstruct index operations without prior length/bounds enforcement; and (3) the application is reachable over a network or accepts untrusted input. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L, score 7.3) reflects the exposure profile of a network protocol parsing library: if attacker-controlled binary data reaches a vulnerable cstruct code path, no authentication or user interaction is needed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade the cstruct opam package to version 6.3.0 or later, which resolves the index mishandling. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of systems and applications using the OCaml cstruct library, prioritizing network-facing services and servers processing untrusted binary data. …
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External POC / Exploit Code
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