Vulnerability-Lookup

CVE-2026-3549 (GCVE-0-2026-3549)

Vulnerability from cvelistv5 – Published: 2026-03-19 20:09 – Updated: 2026-03-24 01:38

Title

ECH parsing heap buffer overflow

Summary

Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving.

Severity ?

8.3 (High)


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

CWE

CWE-122 - Heap-based buffer overflow

Assigner

wolfSSL

References

URL

Tags

https://github.com/wolfSSL/wolfssl/pull/9817

Impacted products

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

Credits

Oleh Konko for independently reporting after internal wolfSSL findings and testing wolfSSL's fix

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-3549

Vulnerability from fkie_nvd - Published: 2026-03-19 21:17 - Updated: 2026-03-26 18:21

Severity ?

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

Summary

References

	URL	Tags
	facts@wolfssl.com	https://github.com/wolfSSL/wolfssl/pull/9817	Issue Tracking, Patch

Impacted products

	Vendor	Product	Version
	wolfssl	wolfssl	*

JSON

To clipboard

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MSRC_CVE-2026-3549

Vulnerability from csaf_microsoft - Published: 2026-03-02 00:00 - Updated: 2026-03-27 01:42

Summary

ECH parsing heap buffer overflow

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-3549

CWE-122 - Heap-based Buffer Overflow

References

URL

Category

	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
	https://support.microsoft.com/lifecycle	external
	https://www.first.org/cvss	external
	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

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        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 mariadb 10.11.16-1 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cbl2 mariadb 10.6.24-1 as a component of CBL Mariner 2.0",
          "product_id": "17086-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "17086"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-3549",
      "cwe": {
        "id": "CWE-122",
        "name": "Heap-based Buffer Overflow"
      },
      "flags": [
        {
          "label": "component_not_present",
          "product_ids": [
            "17084-1",
            "17086-2"
          ]
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "wolfSSL",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_not_affected": [
          "17084-1",
          "17086-2"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-3549 ECH parsing heap buffer overflow - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-3549.json"
        }
      ],
      "title": "ECH parsing heap buffer overflow"
    }
  ]
}

GHSA-J2G5-52P7-MFPC

Vulnerability from github – Published: 2026-03-19 21:30 – Updated: 2026-03-26 18:31

Details

Severity ?

9.8 (Critical)


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

8.3 (High)


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

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-3549"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-122"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-19T21:17:12Z",
    "severity": "HIGH"
  },
  "details": "Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving.",
  "id": "GHSA-j2g5-52p7-mfpc",
  "modified": "2026-03-26T18:31:27Z",
  "published": "2026-03-19T21:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3549"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wolfSSL/wolfssl/pull/9817"
    }
  ],
  "schema_version": "1.4.0",
  "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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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

CVE-2026-3549 (GCVE-0-2026-3549)

FKIE_CVE-2026-3549

MSRC_CVE-2026-3549

GHSA-J2G5-52P7-MFPC

Tags

Sightings

Nomenclature