Vulnerability-Lookup

osec-2026-15

Vulnerability from osv_ocaml

Published

2026-08-07 13:00

Modified

2026-09-10 09:45

Summary

EC public key out of bounds read

Details

The internal Point.of_octets function is missing a length check for compressed points, and thus is raising an exception when a short buffer is provided. This affects all NIST curves (P-256, P-384, P-521) and both Dsa.pub_of_octets and Dh.key_exchange functions.

Fix

The fix is to check the length of the provided buffer.

Timeline

July 28th 2026: report to security@ocaml.org
August 7th: release of mirage-crypto-pk 2.3.0 and security advisory

Severity

4.3 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Credits

Thomas Gazagnaire

Hannes Mehnert

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "affected_bindings": [
          "Mirage_crypto_ec.P256.Dsa.pub_of_octets",
          "Mirage_crypto_ec.P256.Dh.key_exchange",
          "Mirage_crypto_ec.P384.Dsa.pub_of_octets",
          "Mirage_crypto_ec.P384.Dh.key_exchange",
          "Mirage_crypto_ec.P521.Dsa.pub_of_octets",
          "Mirage_crypto_ec.P521.Dh.key_exchange"
        ],
        "opam_constraint": "mirage-crypto-ec {\u003c \"2.3.0\"}"
      },
      "package": {
        "ecosystem": "opam",
        "name": "mirage-crypto-ec",
        "purl": "pkg:opam/mirage-crypto-ec"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1f0bf67044e67cf6e46911fcd77a0ff706b6c3e7"
            }
          ],
          "repo": "https://github.com/mirage/mirage-crypto.git",
          "type": "GIT"
        }
      ],
      "versions": [
        "0.9.0",
        "0.9.1",
        "0.9.2",
        "0.10.0",
        "0.10.1",
        "0.10.2",
        "0.10.3",
        "0.10.4",
        "0.10.5",
        "0.10.6",
        "0.10.7",
        "0.11.0",
        "0.11.1",
        "0.11.2",
        "0.11.3",
        "1.0.0",
        "1.1.0",
        "1.2.0",
        "2.0.0",
        "2.0.1",
        "2.0.2",
        "2.0.3",
        "2.1.0",
        "2.2.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-87736"
  ],
  "credits": [
    {
      "name": "Thomas Gazagnaire",
      "type": "REPORTER"
    },
    {
      "name": "Hannes Mehnert",
      "type": "REMEDIATION_DEVELOPER"
    }
  ],
  "database_specific": {
    "cwe": [
      "CWE-125",
      "CWE-248"
    ],
    "human_link": "https://github.com/ocaml/security-advisories/tree/main/advisories/2026/OSEC-2026-15.md",
    "osv": "https://github.com/ocaml/security-advisories/tree/generated-osv/2026/OSEC-2026-15.json"
  },
  "details": "The internal Point.of_octets function is missing a length check for compressed\npoints, and thus is raising an exception when a short buffer is provided. This\naffects all NIST curves (P-256, P-384, P-521) and both `Dsa.pub_of_octets` and\n`Dh.key_exchange` functions.\n\n## Fix\n\nThe fix is to check the length of the provided buffer.\n\n## Timeline\n\n- July 28th 2026: report to security@ocaml.org\n- August 7th: release of mirage-crypto-pk 2.3.0 and security advisory",
  "id": "OSEC-2026-15",
  "modified": "2026-09-10T09:45:00Z",
  "published": "2026-08-07T13:00:00Z",
  "references": [],
  "schema_version": "1.7.4",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "EC public key out of bounds read"
}

CVE-2026-87736 (GCVE-0-2026-87736)

Vulnerability from cvelistv5 – Published: 2026-09-09 04:19 – Updated: 2026-09-14 15:41

Summary

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.

Severity

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 15:37 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://osv.dev/vulnerability/OSEC-2026-15

Impacted products

1 product

Vendor	Product	Version
OCaml	mirage-crypto-ec	Affected: 0 , < 2.3.0 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-87736",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-14T15:37:48.891674Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-14T15:41:32.129Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:opam/mirage-crypto-ec",
          "product": "mirage-crypto-ec",
          "vendor": "OCaml",
          "versions": [
            {
              "lessThan": "2.3.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-09T04:19:00.276Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://osv.dev/vulnerability/OSEC-2026-15"
        }
      ],
      "x_generator": {
        "engine": "CVE-Request-form 0.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-87736",
    "datePublished": "2026-09-09T04:19:00.276Z",
    "dateReserved": "2026-09-09T04:18:59.766Z",
    "dateUpdated": "2026-09-14T15:41:32.129Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.