Vulnerability-Lookup

GHSA-GHM9-CR32-G9QJ

Vulnerability from github – Published: 2026-04-22 21:05 – Updated: 2026-04-22 21:05

Summary

rust-openssl: rustMdCtxRef::digest_final() writes past caller buffer with no length check

Details

EVP_DigestFinal() always writes EVP_MD_CTX_size(ctx) to the out buffer. If out is smaller than that, MdCtxRef::digest_final() writes past its end, usually corrupting the stack. This is reachable from safe Rust.

Severity ?

8.1 (High)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "openssl"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.10.39"
            },
            {
              "fixed": "0.10.78"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41681"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-22T21:05:02Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "`EVP_DigestFinal()` always writes `EVP_MD_CTX_size(ctx)` to the `out` buffer. If `out` is smaller than that, `MdCtxRef::digest_final()` writes past its end, usually corrupting the stack. This is reachable from safe Rust.",
  "id": "GHSA-ghm9-cr32-g9qj",
  "modified": "2026-04-22T21:05:02Z",
  "published": "2026-04-22T21:05:02Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-ghm9-cr32-g9qj"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/pull/2608"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/commit/826c3888b77add418b394770e2b2e3a72d9f92fe"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rust-openssl/rust-openssl"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "rust-openssl: rustMdCtxRef::digest_final() writes past caller buffer with no length check"
}

CVE-2026-41681 (GCVE-0-2026-41681)

Vulnerability from cvelistv5 – Published: 2026-04-24 17:19 – Updated: 2026-04-24 17:42

Title

rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check

Summary

rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.10.39 to before 0.10.78, EVP_DigestFinal() always writes EVP_MD_CTX_size(ctx) to the out buffer. If out is smaller than that, MdCtxRef::digest_final() writes past its end, usually corrupting the stack. This is reachable from safe Rust. This vulnerability is fixed in 0.10.78.

Severity ?

8.1 (High)


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

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

GitHub_M

References

URL

Tags

	https://github.com/rust-openssl/rust-openssl/secu…	x_refsource_CONFIRM
	https://github.com/rust-openssl/rust-openssl/pull/2608	x_refsource_MISC
	https://github.com/rust-openssl/rust-openssl/comm…	x_refsource_MISC
	https://github.com/rust-openssl/rust-openssl/rele…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	rust-openssl	rust-openssl	Affected: >= 0.10.39, < 0.10.78

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-41681",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-24T17:42:49.447277Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-24T17:42:54.765Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "rust-openssl",
          "vendor": "rust-openssl",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.10.39, \u003c 0.10.78"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "rust-openssl provides OpenSSL bindings for the Rust programming language.  From 0.10.39 to before 0.10.78, EVP_DigestFinal() always writes EVP_MD_CTX_size(ctx) to the out buffer. If out is smaller than that, MdCtxRef::digest_final() writes past its end, usually corrupting the stack. This is reachable from safe Rust. This vulnerability is fixed in 0.10.78."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-121",
              "description": "CWE-121: Stack-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T17:21:01.454Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-ghm9-cr32-g9qj",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-ghm9-cr32-g9qj"
        },
        {
          "name": "https://github.com/rust-openssl/rust-openssl/pull/2608",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rust-openssl/rust-openssl/pull/2608"
        },
        {
          "name": "https://github.com/rust-openssl/rust-openssl/commit/826c3888b77add418b394770e2b2e3a72d9f92fe",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rust-openssl/rust-openssl/commit/826c3888b77add418b394770e2b2e3a72d9f92fe"
        },
        {
          "name": "https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78"
        }
      ],
      "source": {
        "advisory": "GHSA-ghm9-cr32-g9qj",
        "discovery": "UNKNOWN"
      },
      "title": "rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-41681",
    "datePublished": "2026-04-24T17:19:15.187Z",
    "dateReserved": "2026-04-22T03:53:24.406Z",
    "dateUpdated": "2026-04-24T17:42:54.765Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-GHM9-CR32-G9QJ

CVE-2026-41681 (GCVE-0-2026-41681)

Tags

Sightings

Nomenclature