Vulnerability-Lookup

GHSA-3C8F-QQ7H-7QV6

Vulnerability from github – Published: 2026-06-09 18:30 – Updated: 2026-06-10 09:31

Details

Impact summary: The heap buffer over-read may crash the application (Denial of Service) or to load into the decoded ASN.1 object contents of memory beyond the end of the input buffer. More typically such ASN.1 elements would instead be truncated.

An integer truncation in OpenSSL's ASN.1 decoder causes the content length of an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the worst case the truncated length is treated as a request to scan the binary content for a terminating zero byte, possibly causing OpenSSL to read either less than or beyond the end of the allocated buffer.

Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or any other d2i_* decoding function are affected. OpenSSL's own command-line tools are not vulnerable, as data read through the BIO layer is checked before it reaches the affected code. The issue only affects 64-bit Unix and Unix-like platforms; 32-bit platforms and 64-bit Windows are not affected.

The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

Severity

7.5 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-34180"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-09T17:17:04Z",
    "severity": "HIGH"
  },
  "details": "Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive\nelement whose content exceeds 2 gigabytes in length may cause a heap buffer\nover-read on 64-bit Unix and Unix-like platforms.\n\nImpact summary: The heap buffer over-read may crash the application (Denial of\nService) or to load into the decoded ASN.1 object contents of memory beyond the\nend of the input buffer.  More typically such ASN.1 elements would instead be\ntruncated.\n\nAn integer truncation in OpenSSL\u0027s ASN.1 decoder causes the content length of\nan ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the\nworst case the truncated length is treated as a request to scan the binary\ncontent for a terminating zero byte, possibly causing OpenSSL to read either\nless than or beyond the end of the allocated buffer.\n\nApplications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or\nany other d2i_* decoding function are affected. OpenSSL\u0027s own command-line\ntools are not vulnerable, as data read through the BIO layer is checked before\nit reaches the affected code. The issue only affects 64-bit Unix and Unix-like\nplatforms; 32-bit platforms and 64-bit Windows are not affected.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue,\nas the affected code is outside the OpenSSL FIPS module boundary.",
  "id": "GHSA-3c8f-qq7h-7qv6",
  "modified": "2026-06-10T09:31:56Z",
  "published": "2026-06-09T18:30:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34180"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/1c6908e4fa5fa568752221d8eaf561a809751e5d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/cbe418ae978539cf14a398a207dba834c0e93e83"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/d93853c42110d6319e3df07842b488cb9f7ac5ff"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/f696c73c3e61b8c502d040af62e690c060908a16"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/security/commit/1c6908e4fa5fa568752221d8eaf561a809751e5d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/security/commit/cbe418ae978539cf14a398a207dba834c0e93e83"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/security/commit/d93853c42110d6319e3df07842b488cb9f7ac5ff"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/security/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/security/commit/f696c73c3e61b8c502d040af62e690c060908a16"
    },
    {
      "type": "WEB",
      "url": "https://openssl-library.org/news/secadv/20260609.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-34180 (GCVE-0-2026-34180)

Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 07:47

Title

Heap Buffer Over-read in ASN.1 Content Parsing

Summary

Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive element whose content exceeds 2 gigabytes in length may cause a heap buffer over-read on 64-bit Unix and Unix-like platforms. Impact summary: The heap buffer over-read may crash the application (Denial of Service) or to load into the decoded ASN.1 object contents of memory beyond the end of the input buffer. More typically such ASN.1 elements would instead be truncated. An integer truncation in OpenSSL's ASN.1 decoder causes the content length of an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the worst case the truncated length is treated as a request to scan the binary content for a terminating zero byte, possibly causing OpenSSL to read either less than or beyond the end of the allocated buffer. Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or any other d2i_* decoding function are affected. OpenSSL's own command-line tools are not vulnerable, as data read through the BIO layer is checked before it reaches the affected code. The issue only affects 64-bit Unix and Unix-like platforms; 32-bit platforms and 64-bit Windows are not affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

openssl

References

6 references

URL	Tags
https://openssl-library.org/news/secadv/20260609.txt	vendor-advisory
https://github.com/openssl/openssl/commit/f696c73…	patch
https://github.com/openssl/openssl/commit/d93853c…	patch
https://github.com/openssl/openssl/commit/da5d62a…	patch
https://github.com/openssl/openssl/commit/1c6908e…	patch
https://github.com/openssl/openssl/commit/cbe418a…	patch

Impacted products

1 product

Vendor	Product	Version
OpenSSL	OpenSSL	Affected: 4.0.0 , < 4.0.1 (semver) Affected: 3.6.0 , < 3.6.3 (semver) Affected: 3.5.0 , < 3.5.7 (semver) Affected: 3.4.0 , < 3.4.6 (semver) Affected: 3.0.0 , < 3.0.21 (semver) Affected: 1.1.1 , < 1.1.1zh (custom) Affected: 1.0.2 , < 1.0.2zq (custom)

Date Public

2026-06-09 14:00

Credits

Frank Buss Viktor Dukhovni

Show details on NVD website

JSON

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              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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                  }
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                "timestamp": "2026-06-09T19:00:59.503895Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "OpenSSL",
          "vendor": "OpenSSL",
          "versions": [
            {
              "lessThan": "4.0.1",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.6.3",
              "status": "affected",
              "version": "3.6.0",
              "versionType": "semver"
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              "lessThan": "3.5.7",
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            {
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            {
              "lessThan": "1.1.1zh",
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        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Viktor Dukhovni"
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      ],
      "datePublic": "2026-06-09T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
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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.

Detection rules are retrieved from Rulezet.

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GHSA-3C8F-QQ7H-7QV6

CVE-2026-34180 (GCVE-0-2026-34180)

Tags

Sightings

Nomenclature