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mirage-crypto-ec CVE-2026-87736

| EUVDEUVD-2026-74622 MEDIUM
Out-of-bounds Read (CWE-125)
2026-09-09 mitre GHSA-x37h-cx7x-wm76
4.3
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
vuln.today AI
4.3 MEDIUM

Network-reachable key parsing with no complexity barrier, PR:L per established CVSS, impact limited to DoS with no confirmed data exposure.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

3
Metadata Corrected
Sep 09, 2026 - 07:40 vuln.today
tag: Buffer Overflow removed
Analysis Generated
Sep 09, 2026 - 07:06 vuln.today
Patch available
Sep 09, 2026 - 05:18 EUVD

DescriptionCVE.org

An issue was discovered in the mirage-crypto-ec package before 2.3.0 for OCaml. There is an EC public key out-of-bounds read for compressed points.

AnalysisAI

Out-of-bounds read in the mirage-crypto-ec OCaml cryptographic library (versions before 2.3.0) allows low-privileged network attackers to crash or disrupt services that parse compressed elliptic curve public keys. The flaw arises from insufficient bounds checking during compressed EC point deserialization, classified under CWE-125. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target service to accept and parse externally supplied compressed elliptic curve public keys - typically during TLS handshake, certificate validation, or ECDH key exchange. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 4.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) reflects a medium-severity denial-of-service risk with no confirmed confidentiality or integrity impact. … 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 The primary fix is to upgrade mirage-crypto-ec to version 2.3.0 or later, which resolves the out-of-bounds read in compressed EC point handling. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-87736 vulnerability details – vuln.today

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