Vulnerability-Lookup

GHSA-FGX8-Q3CF-P457

Vulnerability from github – Published: 2026-04-10 00:30 – Updated: 2026-04-29 15:30

Details

A stack buffer overflow exists in wolfSSL's PKCS7 implementation in the wc_PKCS7_DecryptOri() function in wolfcrypt/src/pkcs7.c. When processing a CMS EnvelopedData message containing an OtherRecipientInfo (ORI) recipient, the function copies an ASN.1-parsed OID into a fixed 32-byte stack buffer (oriOID[MAX_OID_SZ]) via XMEMCPY without first validating that the parsed OID length does not exceed MAX_OID_SZ. A crafted CMS EnvelopedData message with an ORI recipient containing an OID longer than 32 bytes triggers a stack buffer overflow. Exploitation requires the library to be built with --enable-pkcs7 (disabled by default) and the application to have registered an ORI decrypt callback via wc_PKCS7_SetOriDecryptCb().

Severity

8.0 (High)


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

5.9 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-5295"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-09T23:17:01Z",
    "severity": "MODERATE"
  },
  "details": "A stack buffer overflow exists in wolfSSL\u0027s PKCS7 implementation in the wc_PKCS7_DecryptOri() function in wolfcrypt/src/pkcs7.c. When processing a CMS EnvelopedData message containing an OtherRecipientInfo (ORI) recipient, the function copies an ASN.1-parsed OID into a fixed 32-byte stack buffer (oriOID[MAX_OID_SZ]) via XMEMCPY without first validating that the parsed OID length does not exceed MAX_OID_SZ. A crafted CMS EnvelopedData message with an ORI recipient containing an OID longer than 32 bytes triggers a stack buffer overflow. Exploitation requires the library to be built with --enable-pkcs7 (disabled by default) and the application to have registered an ORI decrypt callback via wc_PKCS7_SetOriDecryptCb().",
  "id": "GHSA-fgx8-q3cf-p457",
  "modified": "2026-04-29T15:30:34Z",
  "published": "2026-04-10T00:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5295"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wolfSSL/wolfssl/pull/10116"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:H/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-2026-5295 (GCVE-0-2026-5295)

Vulnerability from cvelistv5 – Published: 2026-04-09 22:53 – Updated: 2026-04-14 14:32

Title

Stack Buffer Overflow in wolfSSL PKCS7 wc_PKCS7_DecryptOri() via Oversized OID

Summary

Severity

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-14 14:32 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

wolfSSL CNA under the icscert root

CNA scorecard B 80/100 over 52 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/wolfSSL/wolfssl/pull/10116

Impacted products

1 product

Vendor	Product	Version
wolfSSL	wolfSSL	Affected: 0 , < 5.9.1 (semver)

Credits

Sunwoo Lee, (Korea Institute of Energy Technology, KENTECH) Woohyun Choi, (Korea Institute of Energy Technology, KENTECH) Seunghyun Yoon, (Korea Institute of Energy Technology, KENTECH)

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5295",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-14T14:32:50.288335Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-14T14:32:57.454Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "wolfSSL",
          "programFiles": [
            "wolfcrypt/src/pkcs7.c"
          ],
          "repo": "https://github.com/wolfSSL/wolfssl",
          "vendor": "wolfSSL",
          "versions": [
            {
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
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          "type": "finder",
          "value": "Sunwoo Lee, (Korea Institute of Energy Technology, KENTECH)"
        },
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          "type": "finder",
          "value": "Woohyun Choi, (Korea Institute of Energy Technology, KENTECH)"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Seunghyun Yoon, (Korea Institute of Energy Technology, KENTECH)"
        }
      ],
      "descriptions": [
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        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
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            "attackVector": "ADJACENT",
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            "exploitMaturity": "NOT_DEFINED",
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            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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          "descriptions": [
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      "references": [
        {
          "url": "https://github.com/wolfSSL/wolfssl/pull/10116"
        }
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        "discovery": "EXTERNAL"
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      "title": "Stack Buffer Overflow in wolfSSL PKCS7 wc_PKCS7_DecryptOri() via Oversized OID",
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    "datePublished": "2026-04-09T22:53:10.635Z",
    "dateReserved": "2026-03-31T23:22:25.201Z",
    "dateUpdated": "2026-04-14T14:32:57.454Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

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GHSA-FGX8-Q3CF-P457

CVE-2026-5295 (GCVE-0-2026-5295)

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