Vulnerability-Lookup

CNVD-2026-21719

Vulnerability from cnvd - Published: 2026-05-27

Title

wolfSSL存在未明漏洞（CNVD-2026-21719）

Description

wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL存在安全漏洞，该漏洞源于sp_256_get_entry_256_9中的恒定时间掩码逻辑被GCC优化为条件分支，破坏了ECC标量乘法的侧信道抵抗能力，攻击者可利用该漏洞通过时序分析恢复密钥。

Severity

低

Patch Name

wolfSSL存在未明漏洞（CNVD-2026-21719）的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/wolfSSL/wolfssl/releases

Reference

https://github.com/wolfSSL/wolfssl/pull/9855

Impacted products

Name
wolfSSL WolfSSL <5.9.0

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-3580",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-3580"
    }
  },
  "description": "wolfSSL\uff08CyaSSL\uff09\u662f\u7f8e\u56fdwolfSSL\u516c\u53f8\u7684\u4e00\u4e2a\u9488\u5bf9\u5d4c\u5165\u5f0f\u7cfb\u7edf\u5f00\u53d1\u4eba\u5458\u4f7f\u7528\u7684\u5c0f\u7684\u3001\u53ef\u79fb\u690d\u7684\u5d4c\u5165\u5f0fSSL\u7f16\u7a0b\u5e93\u3002\n\nwolfSSL\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8esp_256_get_entry_256_9\u4e2d\u7684\u6052\u5b9a\u65f6\u95f4\u63a9\u7801\u903b\u8f91\u88abGCC\u4f18\u5316\u4e3a\u6761\u4ef6\u5206\u652f\uff0c\u7834\u574f\u4e86ECC\u6807\u91cf\u4e58\u6cd5\u7684\u4fa7\u4fe1\u9053\u62b5\u6297\u80fd\u529b\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u65f6\u5e8f\u5206\u6790\u6062\u590d\u5bc6\u94a5\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/wolfSSL/wolfssl/releases",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-21719",
  "openTime": "2026-05-27",
  "patchDescription": "wolfSSL\uff08CyaSSL\uff09\u662f\u7f8e\u56fdwolfSSL\u516c\u53f8\u7684\u4e00\u4e2a\u9488\u5bf9\u5d4c\u5165\u5f0f\u7cfb\u7edf\u5f00\u53d1\u4eba\u5458\u4f7f\u7528\u7684\u5c0f\u7684\u3001\u53ef\u79fb\u690d\u7684\u5d4c\u5165\u5f0fSSL\u7f16\u7a0b\u5e93\u3002\r\n\r\nwolfSSL\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8esp_256_get_entry_256_9\u4e2d\u7684\u6052\u5b9a\u65f6\u95f4\u63a9\u7801\u903b\u8f91\u88abGCC\u4f18\u5316\u4e3a\u6761\u4ef6\u5206\u652f\uff0c\u7834\u574f\u4e86ECC\u6807\u91cf\u4e58\u6cd5\u7684\u4fa7\u4fe1\u9053\u62b5\u6297\u80fd\u529b\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u65f6\u5e8f\u5206\u6790\u6062\u590d\u5bc6\u94a5\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "wolfSSL\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff08CNVD-2026-21719\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "wolfSSL WolfSSL \u003c5.9.0"
  },
  "referenceLink": "https://github.com/wolfSSL/wolfssl/pull/9855",
  "serverity": "\u4f4e",
  "submitTime": "2026-03-26",
  "title": "wolfSSL\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff08CNVD-2026-21719\uff09"
}

CVE-2026-3580 (GCVE-0-2026-3580)

Vulnerability from cvelistv5 – Published: 2026-03-19 19:46 – Updated: 2026-03-19 20:25

Title

Compiler-induced timing leak in sp_256_get_entry_256_9 on RISC-V

Summary

In wolfSSL 5.8.4, constant-time masking logic in sp_256_get_entry_256_9 is optimized into conditional branches (bnez) by GCC when targeting RISC-V RV32I with -O3. This transformation breaks the side-channel resistance of ECC scalar multiplication, potentially allowing a local attacker to recover secret keys via timing analysis.

Severity

2.1 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-19 20:25 UTC

CWE

CWE-203 - Observable Discrepancy

Assigner

wolfSSL icscert root Scorecard

References

1 reference

URL	Tags
https://github.com/wolfSSL/wolfssl/pull/9855

Impacted products

1 product

Vendor	Product	Version
wolfSSL	wolfSSL	Affected: 0 , < 5.9.0 (semver)

Credits

Wind Wong

Show details on NVD website

JSON

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  "containers": {
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      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-3580",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-19T20:25:11.122057Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          ],
          "product": "wolfSSL",
          "vendor": "wolfSSL",
          "versions": [
            {
              "lessThan": "5.9.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
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          ]
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          "type": "finder",
          "value": "Wind Wong"
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      "descriptions": [
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          "supportingMedia": [
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              "value": "In wolfSSL 5.8.4, constant-time masking logic in sp_256_get_entry_256_9 is optimized into conditional branches (bnez) by GCC when targeting RISC-V RV32I with -O3. This transformation breaks the side-channel resistance of ECC scalar multiplication, potentially allowing a local attacker to recover secret keys via timing analysis."
            }
          ],
          "value": "In wolfSSL 5.8.4, constant-time masking logic in sp_256_get_entry_256_9 is optimized into conditional branches (bnez) by GCC when targeting RISC-V RV32I with -O3. This transformation breaks the side-channel resistance of ECC scalar multiplication, potentially allowing a local attacker to recover secret keys via timing analysis."
        }
      ],
      "metrics": [
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          "cvssV4_0": {
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 2.1,
            "baseSeverity": "LOW",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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        "dateUpdated": "2026-03-19T19:46:58.783Z",
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          "url": "https://github.com/wolfSSL/wolfssl/pull/9855"
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        "discovery": "EXTERNAL"
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    "assignerShortName": "wolfSSL",
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    "datePublished": "2026-03-19T19:46:58.783Z",
    "dateReserved": "2026-03-05T00:16:16.057Z",
    "dateUpdated": "2026-03-19T20:25:20.427Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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CNVD-2026-21719

CVE-2026-3580 (GCVE-0-2026-3580)

Tags

Sightings

Nomenclature

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