Vulnerability-Lookup

UBUNTU-CVE-2025-66038 (CVE-2025-66038)

Vulnerability from osv_ubuntu – Published: 2026-03-30 18:16 – Updated: 2026-05-20 15:22 – Source website

Details

OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibble). With a 1-byte buffer {0x0A}, the encoded element claims tag=0 and length=10 but no value bytes follow. Calling sc_compacttlv_find_tag with search tag 0x00 returns a pointer equal to buf+1 and outlen=10 without verifying that the claimed value length fits within the remaining buffer. In cases where the sc_compacttlv_find_tag is provided untrusted data (such as being read from cards/files), attackers may be able to influence it to return out-of-bounds pointers leading to downstream memory corruption when subsequent code tries to dereference the pointer. This issue has been patched in version 0.27.0.

Severity

3.9 (Low)


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

6.8 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2025-66038	REPORT
	https://www.cve.org/CVERecord?id=CVE-2025-66038	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "opensc",
            "binary_version": "0.15.0-1ubuntu1+esm3"
          },
          {
            "binary_name": "opensc-pkcs11",
            "binary_version": "0.15.0-1ubuntu1+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "opensc",
        "purl": "pkg:deb/ubuntu/opensc@0.15.0-1ubuntu1+esm3?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.15.0-1ubuntu1",
        "0.15.0-1ubuntu1+esm1",
        "0.15.0-1ubuntu1+esm2",
        "0.15.0-1ubuntu1+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "opensc",
            "binary_version": "0.17.0-3ubuntu0.1~esm3"
          },
          {
            "binary_name": "opensc-pkcs11",
            "binary_version": "0.17.0-3ubuntu0.1~esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "opensc",
        "purl": "pkg:deb/ubuntu/opensc@0.17.0-3ubuntu0.1~esm3?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.17.0-1",
        "0.17.0-2",
        "0.17.0-2build1",
        "0.17.0-3",
        "0.17.0-3ubuntu0.1~esm1",
        "0.17.0-3ubuntu0.1~esm2",
        "0.17.0-3ubuntu0.1~esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "opensc",
            "binary_version": "0.20.0-3ubuntu0.1~esm4"
          },
          {
            "binary_name": "opensc-pkcs11",
            "binary_version": "0.20.0-3ubuntu0.1~esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "opensc",
        "purl": "pkg:deb/ubuntu/opensc@0.20.0-3ubuntu0.1~esm4?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.19.0-2",
        "0.20.0-1",
        "0.20.0-2",
        "0.20.0-3",
        "0.20.0-3ubuntu0.1~esm1",
        "0.20.0-3ubuntu0.1~esm2",
        "0.20.0-3ubuntu0.1~esm3",
        "0.20.0-3ubuntu0.1~esm4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "opensc",
            "binary_version": "0.22.0-1ubuntu2.1+esm1"
          },
          {
            "binary_name": "opensc-pkcs11",
            "binary_version": "0.22.0-1ubuntu2.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "opensc",
        "purl": "pkg:deb/ubuntu/opensc@0.22.0-1ubuntu2.1+esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.21.0-1ubuntu1",
        "0.22.0-1ubuntu2",
        "0.22.0-1ubuntu2+esm1",
        "0.22.0-1ubuntu2.1",
        "0.22.0-1ubuntu2.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "opensc",
            "binary_version": "0.25.0~rc1-1ubuntu0.2+esm1"
          },
          {
            "binary_name": "opensc-pkcs11",
            "binary_version": "0.25.0~rc1-1ubuntu0.2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "opensc",
        "purl": "pkg:deb/ubuntu/opensc@0.25.0~rc1-1ubuntu0.2+esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.23.0-1ubuntu4",
        "0.24.0~rc1-1",
        "0.25.0~rc1-1",
        "0.25.0~rc1-1build1",
        "0.25.0~rc1-1build2",
        "0.25.0~rc1-1ubuntu0.1~esm1",
        "0.25.0~rc1-1ubuntu0.1",
        "0.25.0~rc1-1ubuntu0.2",
        "0.25.0~rc1-1ubuntu0.2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "opensc",
            "binary_version": "0.26.1-3"
          },
          {
            "binary_name": "opensc-pkcs11",
            "binary_version": "0.26.1-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "opensc",
        "purl": "pkg:deb/ubuntu/opensc@0.26.1-3?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.26.1-1",
        "0.26.1-2",
        "0.26.1-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "opensc",
            "binary_version": "0.27.0~rc1-1"
          },
          {
            "binary_name": "opensc-pkcs11",
            "binary_version": "0.27.0~rc1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "opensc",
        "purl": "pkg:deb/ubuntu/opensc@0.27.0~rc1-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.26.1-3",
        "0.26.1-3ubuntu1",
        "0.27.0~rc1-1"
      ]
    }
  ],
  "aliases": [],
  "details": "OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibble). With a 1-byte buffer {0x0A}, the encoded element claims tag=0 and length=10 but no value bytes follow. Calling sc_compacttlv_find_tag with search tag 0x00 returns a pointer equal to buf+1 and outlen=10 without verifying that the claimed value length fits within the remaining buffer. In cases where the sc_compacttlv_find_tag is provided untrusted data (such as being read from cards/files), attackers may be able to influence it to return out-of-bounds pointers leading to downstream memory corruption when subsequent code tries to dereference the pointer. This issue has been patched in version 0.27.0.",
  "id": "UBUNTU-CVE-2025-66038",
  "modified": "2026-05-20T15:22:58Z",
  "published": "2026-03-30T18:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-66038"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-66038"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-66038"
  ]
}

CVE-2025-66038 (GCVE-0-2025-66038)

Vulnerability from cvelistv5 – Published: 2026-03-30 17:03 – Updated: 2026-04-01 18:15

Title

OpenSC: `sc_compacttlv_find_tag` can return out-of-bounds pointers

Summary

Severity

3.9 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-01 18:15 UTC

CWE

CWE-126 - Buffer Over-read

Assigner

GitHub_M mitre root Scorecard

References

3 references

URL	Tags
https://github.com/OpenSC/OpenSC/security/advisor…	x_refsource_CONFIRM
https://github.com/OpenSC/OpenSC/commit/6db171bcb…	x_refsource_MISC
https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66038	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
OpenSC	OpenSC	Affected: < 0.27.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-66038",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-01T18:15:18.318069Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-01T18:15:33.347Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "OpenSC",
          "vendor": "OpenSC",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.27.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibble). With a 1-byte buffer {0x0A}, the encoded element claims tag=0 and length=10 but no value bytes follow. Calling sc_compacttlv_find_tag with search tag 0x00 returns a pointer equal to buf+1 and outlen=10 without verifying that the claimed value length fits within the remaining buffer. In cases where the sc_compacttlv_find_tag is provided untrusted data (such as being read from cards/files), attackers may be able to influence it to return out-of-bounds pointers leading to downstream memory corruption when subsequent code tries to dereference the pointer. This issue has been patched in version 0.27.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "PHYSICAL",
            "availabilityImpact": "LOW",
            "baseScore": 3.9,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-126",
              "description": "CWE-126: Buffer Over-read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-30T17:03:55.914Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/OpenSC/OpenSC/security/advisories/GHSA-72x5-fwjx-2459",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/OpenSC/OpenSC/security/advisories/GHSA-72x5-fwjx-2459"
        },
        {
          "name": "https://github.com/OpenSC/OpenSC/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OpenSC/OpenSC/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c"
        },
        {
          "name": "https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66038",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66038"
        }
      ],
      "source": {
        "advisory": "GHSA-72x5-fwjx-2459",
        "discovery": "UNKNOWN"
      },
      "title": "OpenSC: `sc_compacttlv_find_tag` can return out-of-bounds pointers"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-66038",
    "datePublished": "2026-03-30T17:03:55.914Z",
    "dateReserved": "2025-11-21T01:08:02.615Z",
    "dateUpdated": "2026-04-01T18:15:33.347Z",
    "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.

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.

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Action not permitted

UBUNTU-CVE-2025-66038 (CVE-2025-66038)

CVE-2025-66038 (GCVE-0-2025-66038)

Tags

Sightings

Nomenclature

Related by attack behaviour