Vulnerability-Lookup

CVE-2026-31789 (GCVE-0-2026-31789)

Vulnerability from cvelistv5 – Published: 2026-04-07 22:00 – Updated: 2026-05-12 12:09

Title

Heap Buffer Overflow in Hexadecimal Conversion

Summary

Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker can supply a crafted X.509 certificate with an excessively large OCTET STRING value in extensions such as the Subject Key Identifier (SKID) or Authority Key Identifier (AKID) which are being converted to hex, the size of the buffer needed for the result is calculated as multiplication of the input length by 3. On 32 bit platforms, this multiplication may overflow resulting in the allocation of a smaller buffer and a heap buffer overflow. Applications and services that print or log contents of untrusted X.509 certificates are vulnerable to this issue. As the certificates would have to have sizes of over 1 Gigabyte, printing or logging such certificates is a fairly unlikely operation and only 32 bit platforms are affected, this issue was assigned Low severity. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

Severity

5.8 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-09 03:56 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

openssl mitre root

References

7 references

URL	Tags
https://openssl-library.org/news/secadv/20260407.txt	vendor-advisory
https://github.com/openssl/openssl/commit/a242160…	patch
https://github.com/openssl/openssl/commit/945b935…	patch
https://github.com/openssl/openssl/commit/364f095…	patch
https://github.com/openssl/openssl/commit/7a9087e…	patch
https://github.com/openssl/openssl/commit/a91e537…	patch
https://cert-portal.siemens.com/productcert/html/…

Impacted products

2 products

Vendor	Product	Version	CPE status
OpenSSL	OpenSSL	Affected: 3.6.0 , < 3.6.2 (semver) Affected: 3.5.0 , < 3.5.6 (semver) Affected: 3.4.0 , < 3.4.5 (semver) Affected: 3.3.0 , < 3.3.7 (semver) Affected: 3.0.0 , < 3.0.20 (semver)	guessed
Siemens	SIMATIC CN 4100	Affected: 0 , < V5.0 (custom)	guessed

Date Public

2026-04-07 14:00

Credits

Quoc Tran (Xint.io - US Team) Igor Ustinov

Show details on NVD website

JSON

To clipboard

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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"LOW\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-31789\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-09T03:56:05.246752Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-13T13:00:34.871Z\"}}], \"cna\": {\"title\": \"Heap Buffer Overflow in Hexadecimal Conversion\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Quoc Tran (Xint.io - US Team)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Igor Ustinov\"}], \"metrics\": [{\"other\": {\"type\": \"https://openssl-library.org/policies/general/security-policy/\", \"content\": {\"text\": \"Low\"}}, \"format\": \"other\"}], \"affected\": [{\"vendor\": \"OpenSSL\", \"product\": \"OpenSSL\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.6.0\", \"lessThan\": \"3.6.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.5.0\", \"lessThan\": \"3.5.6\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.4.0\", \"lessThan\": \"3.4.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.3.0\", \"lessThan\": \"3.3.7\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.0.0\", \"lessThan\": \"3.0.20\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-04-07T14:00:00.000Z\", \"references\": [{\"url\": \"https://openssl-library.org/news/secadv/20260407.txt\", \"name\": \"OpenSSL Advisory\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/a24216018e1ede8ff01a4ff5afff7dfbd443e2f9\", \"name\": \"3.6.2 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/945b935ac66cc7f1a41f1b849c7c25adb5351f49\", \"name\": \"3.5.6 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/364f095b80601db632b0def6a33316967f863bde\", \"name\": \"3.4.5 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/7a9087efd769f362ad9c0e30c7baaa6bbfa65ecf\", \"name\": \"3.3.7 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/a91e537d16d74050dbde50bb0dfb1fe9930f0521\", \"name\": \"3.0.20 git commit\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Issue summary: Converting an excessively large OCTET STRING value to\\na hexadecimal string leads to a heap buffer overflow on 32 bit platforms.\\n\\nImpact summary: A heap buffer overflow may lead to a crash or possibly\\nan attacker controlled code execution or other undefined behavior.\\n\\nIf an attacker can supply a crafted X.509 certificate with an excessively\\nlarge OCTET STRING value in extensions such as the Subject Key Identifier\\n(SKID) or Authority Key Identifier (AKID) which are being converted to hex,\\nthe size of the buffer needed for the result is calculated as multiplication\\nof the input length by 3. On 32 bit platforms, this multiplication may overflow\\nresulting in the allocation of a smaller buffer and a heap buffer overflow.\\n\\nApplications and services that print or log contents of untrusted X.509\\ncertificates are vulnerable to this issue. As the certificates would have\\nto have sizes of over 1 Gigabyte, printing or logging such certificates\\nis a fairly unlikely operation and only 32 bit platforms are affected,\\nthis issue was assigned Low severity.\\n\\nThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this\\nissue, as the affected code is outside the OpenSSL FIPS module boundary.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: Converting an excessively large OCTET STRING value to\u003cbr\u003ea hexadecimal string leads to a heap buffer overflow on 32 bit platforms.\u003cbr\u003e\u003cbr\u003eImpact summary: A heap buffer overflow may lead to a crash or possibly\u003cbr\u003ean attacker controlled code execution or other undefined behavior.\u003cbr\u003e\u003cbr\u003eIf an attacker can supply a crafted X.509 certificate with an excessively\u003cbr\u003elarge OCTET STRING value in extensions such as the Subject Key Identifier\u003cbr\u003e(SKID) or Authority Key Identifier (AKID) which are being converted to hex,\u003cbr\u003ethe size of the buffer needed for the result is calculated as multiplication\u003cbr\u003eof the input length by 3. On 32 bit platforms, this multiplication may overflow\u003cbr\u003eresulting in the allocation of a smaller buffer and a heap buffer overflow.\u003cbr\u003e\u003cbr\u003eApplications and services that print or log contents of untrusted X.509\u003cbr\u003ecertificates are vulnerable to this issue. As the certificates would have\u003cbr\u003eto have sizes of over 1 Gigabyte, printing or logging such certificates\u003cbr\u003eis a fairly unlikely operation and only 32 bit platforms are affected,\u003cbr\u003ethis issue was assigned Low severity.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this\u003cbr\u003eissue, as the affected code is outside the OpenSSL FIPS module boundary.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-04-07T22:00:54.983Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31789\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-10T20:08:19.604Z\", \"dateReserved\": \"2026-03-09T15:56:53.191Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-04-07T22:00:54.983Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

SUSE-SU-2026:21186-1

Vulnerability from csaf_suse - Published: 2026-04-13 15:48 - Updated: 2026-04-13 15:48

Summary

Security update for openssl-3

Severity

Important

Scope

7 vulnerabilities in this advisory, including CVE-2026-31789.

CVE-2026-31789

7.3 (High)


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

Recommended: 38 products

Open the full advisory

ubuntu-cve-2026-31789

Vulnerability from osv_ubuntu

Published

2026-04-07 00:00

Modified

2026-09-15 06:14

Summary

Details

Severity

9.8 (Critical)


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

5.8 (Medium)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2026-31789	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-31789	REPORT
	https://www.openwall.com/lists/oss-security/2026/…	REPORT
	https://ubuntu.com/security/notices/USN-8155-1	ADVISORY

JSON

To clipboard

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        "availability": "No subscription required",
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            "binary_name": "libssl3",
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        "priority_reason": "OpenSSL developers have rated this issue as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
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        "purl": "pkg:deb/ubuntu/openssl@3.0.2-0ubuntu1.23?arch=source\u0026distro=jammy"
      },
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  "aliases": [],
  "details": "Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker can supply a crafted X.509 certificate with an excessively large OCTET STRING value in extensions such as the Subject Key Identifier (SKID) or Authority Key Identifier (AKID) which are being converted to hex, the size of the buffer needed for the result is calculated as multiplication of the input length by 3. On 32 bit platforms, this multiplication may overflow resulting in the allocation of a smaller buffer and a heap buffer overflow. Applications and services that print or log contents of untrusted X.509 certificates are vulnerable to this issue. As the certificates would have to have sizes of over 1 Gigabyte, printing or logging such certificates is a fairly unlikely operation and only 32 bit platforms are affected, this issue was assigned Low severity. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.",
  "id": "UBUNTU-CVE-2026-31789",
  "modified": "2026-09-15T06:14:18Z",
  "published": "2026-04-07T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-31789"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31789"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2026/04/07/11"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8155-1"
    }
  ],
  "related": [
    "USN-8155-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-31789"
  ]
}

WID-SEC-W-2026-0995

Vulnerability from csaf_certbund - Published: 2026-04-07 22:00 - Updated: 2026-06-16 22:00

Summary

OpenSSL: Mehrere Schwachstellen

Severity

Mittel

Scope

7 vulnerabilities in this advisory, including CVE-2026-31789.

CVE-2026-31789

Known affected: 25 products

Open the full advisory

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.

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.

Action not permitted

CVE-2026-31789 (GCVE-0-2026-31789)

SUSE-SU-2026:21186-1

ubuntu-cve-2026-31789

Vulnerability from osv_ubuntu

WID-SEC-W-2026-0995

Tags

Sightings

Nomenclature