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Medium

Heap Use-After-Free in PQC Hybrid KeyShare Error Cleanup in wolfSSL TLS 1.3

Type: advisorySources: OSV

A heap use-after-free exists in wolfSSL's TLS 1.3 post-quantum cryptography (PQC) hybrid KeyShare processing. In the error handling path of TLSX_KeyShare_ProcessPqcHybridClient() in src/tls.c, the inner function TLSX_KeyShare_ProcessPqcClient_ex() frees a KyberKey object upon encountering an error. The caller then invokes TLSX_KeyShare_FreeAll(), which attempts to call ForceZero() on the already-freed KyberKey, resulting in writes of zero bytes over freed heap memory.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-5460
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 18:43 UTC · Revision 1

Source evidence

Heap Use-After-Free in PQC Hybrid KeyShare Error Cleanup in wolfSSL TLS 1.3

core-osv · Original source

Published 9 Apr 2026, 23:29 UTC

A heap use-after-free exists in wolfSSL's TLS 1.3 post-quantum cryptography (PQC) hybrid KeyShare processing. In the error handling path of TLSX_KeyShare_ProcessPqcHybridClient() in src/tls.c, the inner function TLSX_KeyShare_ProcessPqcClient_ex() frees a KyberKey object upon encountering an error. The caller then invokes TLSX_KeyShare_FreeAll(), which attempts to call ForceZero() on the already-freed KyberKey, resulting in writes of zero bytes over freed heap memory.

osv:CVE-2026-5460
Complete source record
{
  "id": "f69897248ce001b0ba4b13b524aca2d43925d795884b8e89d77dce7fe8eabe59",
  "url": "https://osv.dev/vulnerability/CVE-2026-5460",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Heap Use-After-Free in PQC Hybrid KeyShare Error Cleanup in wolfSSL TLS 1.3",
    "summary": "A heap use-after-free exists in wolfSSL's TLS 1.3 post-quantum cryptography (PQC) hybrid KeyShare processing. In the error handling path of TLSX_KeyShare_ProcessPqcHybridClient() in src/tls.c, the inner function TLSX_KeyShare_ProcessPqcClient_ex() frees a KyberKey object upon encountering an error. The caller then invokes TLSX_KeyShare_FreeAll(), which attempts to call ForceZero() on the already-freed KyberKey, resulting in writes of zero bytes over freed heap memory.",
    "evidence": "osv:CVE-2026-5460",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-5460",
      "aliases": [
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      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
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              "type": "GIT",
              "events": [
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                {
                  "fixed": "1d363f3adceba9d1478230ede476a37b0dcdef24"
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                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
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                    "cpe": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*",
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          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5460.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.235031153Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5460.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-5460",
        "https://github.com/wolfssl/wolfssl/pull/10092",
        "https://github.com/wolfSSL/wolfssl"
      ],
      "provider_metadata": {
        "cwe_ids": [
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        "cna_assigner": "wolfSSL",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5460.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-5460",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488690,
  "published_at": "2026-04-09T23:29:27.577+00:00"
}