Vulnerability-Lookup

GHSA-VXJJ-52H8-95W5

Vulnerability from github – Published: 2026-05-29 15:30 – Updated: 2026-05-29 15:30

Details

OpenSC before 0.27.0, fixed in commit 0358817, contains a stack and heap buffer overrun vulnerability in the do_key_value() function in src/pkcs15init/profile.c that allows attackers to corrupt memory by supplying a crafted profile configuration file. During pkcs15-init invocation, a key value entry beginning with '=' followed by more than sizeof(keybuf) characters is copied into keybuf via memcpy without a length check, causing both stack and heap buffer overruns.

Severity

3.8 (Low)


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

1.0 (Low)


                  
                    CVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-40528"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-29T14:16:26Z",
    "severity": "LOW"
  },
  "details": "OpenSC before 0.27.0, fixed in commit 0358817, contains a stack and heap buffer overrun vulnerability in the do_key_value() function in src/pkcs15init/profile.c that allows attackers to corrupt memory by supplying a crafted profile configuration file. During pkcs15-init invocation, a key value entry beginning with \u0027=\u0027 followed by more than sizeof(keybuf) characters is copied into keybuf via memcpy without a length check, causing both stack and heap buffer overruns.",
  "id": "GHSA-vxjj-52h8-95w5",
  "modified": "2026-05-29T15:30:33Z",
  "published": "2026-05-29T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40528"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpenSC/OpenSC/commit/0358817ec74aeca654f83e7709c7720b14c5db59"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/opensc-buffer-overrun-in-do-key-value-via-profile-c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-40528 (GCVE-0-2026-40528)

Vulnerability from cvelistv5 – Published: 2026-05-29 13:38 – Updated: 2026-07-14 20:00 X_Open Source

Title

OpenSC < 0.27.0 Buffer Overrun in do_key_value() via profile.c

Summary

Severity

1 (Low)


                        
                          CVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

3.8 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-29 13:58 UTC

CWE

CWE-121 - Stack-based Buffer Overflow
CWE-122 - Heap-based Buffer Overflow

Assigner

VulnCheck mitre root Scorecard

References

2 references

URL	Tags
https://github.com/OpenSC/OpenSC/commit/0358817ec…	patch
https://www.vulncheck.com/advisories/opensc-buffe…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
OpenSC	OpenSC	Affected: 0 , < 0.27.0 (semver) Affected: 0 , < 0358817ec74aeca654f83e7709c7720b14c5db59 (git) cpe:2.3:a:opensc_project:opensc:::::::: cpe:2.3:a:opensc_project:opensc::::::::

Date Public

2026-03-30 00:00

Credits

Nicholas Carlini of Anthropic

Show details on NVD website

JSON

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  "containers": {
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      {
        "metrics": [
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            "other": {
              "content": {
                "id": "CVE-2026-40528",
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                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-29T13:58:10.279206Z",
                "version": "2.0.3"
              },
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-29T13:58:18.086Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "affected",
          "packageURL": "pkg:github/OpenSC/OpenSC",
          "product": "OpenSC",
          "repo": "https://github.com/OpenSC/OpenSC",
          "vendor": "OpenSC",
          "versions": [
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              "lessThan": "0.27.0",
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              "version": "0",
              "versionType": "semver"
            },
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              "status": "affected",
              "version": "0",
              "versionType": "git"
            }
          ]
        }
      ],
      "cpeApplicability": [
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              "cpeMatch": [
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                },
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  },
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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.
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GHSA-VXJJ-52H8-95W5

CVE-2026-40528 (GCVE-0-2026-40528)

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Sightings

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