Vulnerability-Lookup

CVE-2026-81341 (GCVE-0-2026-81341)

Vulnerability from cvelistv5 – Published: 2026-08-28 14:43 – Updated: 2026-08-28 18:17

Title

wolfEngine reuses the AES-CCM nonce on TLS 1.2 / DTLS 1.2 records

Summary

wolfEngine before 1.4.1 sources the explicit AES-CCM nonce for TLS 1.2 and DTLS 1.2 records from the record input buffer instead of the TLS sequence number carried in the additional authenticated data. Because the record layer leaves the explicit-nonce field for the cipher to populate, the value read is constant across records, so every AES-CCM record within a connection is encrypted under an identical key and nonce pair. Reusing a CCM key and nonce weakens confidentiality (identical keystream across records, so a known record recovers the others) and integrity (authentication tag forgery). Only wolfEngine is affected; wolfProvider is not. AES-GCM under wolfEngine is tracked separately. AES-CCM cipher suites are not enabled by default and must be explicitly selected, which limits exposure. TLS 1.3 and non-TLS use of the cipher are not affected.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 18:17 UTC

CWE

CWE-323 - Reusing a Nonce, Key Pair in Encryption

Assigner

wolfSSL icscert root

References

1 reference

URL	Tags
https://www.wolfssl.com/docs/security-vulnerabilities/

Impacted products

1 product

Vendor	Product	Version	CPE status
wolfSSL Inc.	wolfEngine	Affected: 0 , ≤ 1.4.0 (git)	guessed

Credits

wolfSSL security team

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-81341",
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                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-08-28T18:17:28.860432Z",
                "version": "2.0.3"
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          ],
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      "source": {
        "discovery": "UNKNOWN"
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      "title": "wolfEngine reuses the AES-CCM nonce on TLS 1.2 / DTLS 1.2 records",
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FKIE_CVE-2026-81341

Vulnerability from fkie_nvd - Published: 2026-08-28 16:18 - Updated: 2026-08-28 20:20

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Summary

References

	URL	Tags
	facts@wolfssl.com	https://www.wolfssl.com/docs/security-vulnerabilities/

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "wolfEngine",
          "repo": "https://github.com/wolfSSL/wolfengine",
          "vendor": "wolfSSL Inc.",
          "versions": [
            {
              "lessThanOrEqual": "1.4.0",
              "status": "affected",
              "version": "0",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "facts@wolfssl.com"
    }
  ],
  "cveTags": [],
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    {
      "lang": "en",
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    }
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  "lastModified": "2026-08-28T20:20:09.960",
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          "privilegesRequired": "NONE",
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}

GHSA-VF9H-5C79-C2XP

Vulnerability from github – Published: 2026-08-28 18:31 – Updated: 2026-08-28 18:31

Details

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-81341"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-323"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T16:18:29Z",
    "severity": "MODERATE"
  },
  "details": "wolfEngine before 1.4.1 sources the explicit AES-CCM nonce for TLS 1.2 and DTLS 1.2 records from the record input buffer instead of the TLS sequence number carried in the additional authenticated data. Because the record layer leaves the explicit-nonce field for the cipher to populate, the value read is constant across records, so every AES-CCM record within a connection is encrypted under an identical key and nonce pair. Reusing a CCM key and nonce weakens confidentiality (identical keystream across records, so a known record recovers the others) and integrity (authentication tag forgery). Only wolfEngine is affected; wolfProvider is not. AES-GCM under wolfEngine is tracked separately. AES-CCM cipher suites are not enabled by default and must be explicitly selected, which limits exposure. TLS 1.3 and non-TLS use of the cipher are not affected.",
  "id": "GHSA-vf9h-5c79-c2xp",
  "modified": "2026-08-28T18:31:30Z",
  "published": "2026-08-28T18:31:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81341"
    },
    {
      "type": "WEB",
      "url": "https://www.wolfssl.com/docs/security-vulnerabilities"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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-2026-81341 (GCVE-0-2026-81341)

FKIE_CVE-2026-81341

GHSA-VF9H-5C79-C2XP

Tags

Sightings

Nomenclature