Vulnerability-Lookup

GHSA-24VQ-QFC5-QRMJ

Vulnerability from github – Published: 2026-03-19 18:31 – Updated: 2026-04-29 21:31

Details

A heap-buffer-overflow vulnerability exists in wolfSSL's wolfSSL_d2i_SSL_SESSION() function. When deserializing session data with SESSION_CERTS enabled, certificate and session id lengths are read from an untrusted input without bounds validation, allowing an attacker to overflow fixed-size buffers and corrupt heap memory. A maliciously crafted session would need to be loaded from an external source to trigger this vulnerability. Internal sessions were not vulnerable.

Severity

8.1 (High)


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

5.0 (Medium)


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

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  "affected": [],
  "aliases": [
    "CVE-2026-2646"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-122",
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-19T18:16:22Z",
    "severity": "MODERATE"
  },
  "details": "A heap-buffer-overflow vulnerability exists in wolfSSL\u0027s wolfSSL_d2i_SSL_SESSION() function. When deserializing session data with SESSION_CERTS enabled, certificate and session id lengths are read from an untrusted input without bounds validation, allowing an attacker to overflow fixed-size buffers and corrupt heap memory. A maliciously crafted session would need to be loaded from an external source to trigger this vulnerability. Internal sessions were not vulnerable.",
  "id": "GHSA-24vq-qfc5-qrmj",
  "modified": "2026-04-29T21:31:19Z",
  "published": "2026-03-19T18:31:19Z",
  "references": [
    {
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2646"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wolfSSL/wolfssl/pull/9748"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wolfSSL/wolfssl/pull/9949"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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"
    }
  ]
}

CVE-2026-2646 (GCVE-0-2026-2646)

Vulnerability from cvelistv5 – Published: 2026-03-19 17:25 – Updated: 2026-03-19 17:44

Title

Heap buffer overflow in session parsing with wolfSSL_d2i_SSL_SESSION() function

Summary

Severity

5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-19 17:43 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

wolfSSL icscert root

References

2 references

URL	Tags
https://github.com/wolfSSL/wolfssl/pull/9748
https://github.com/wolfSSL/wolfssl/pull/9949

Impacted products

1 product

Vendor	Product	Version
wolfssl	wolfssl	Affected: 0 , ≤ 5.8.4 (semver)

Credits

Jonathan Bar Or (@yo_yo_yo_jbo) Haruto Kimura (Stella)

Show details on NVD website

JSON

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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.

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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GHSA-24VQ-QFC5-QRMJ

CVE-2026-2646 (GCVE-0-2026-2646)

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