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DEBIAN-CVE-2026-5188

Type: advisorySource: OSV1 source record

An integer underflow issue exists in wolfSSL when parsing the Subject Alternative Name (SAN) extension of X.509 certificates. A malformed certificate can specify an entry length larger than the enclosing sequence, causing the internal length counter to wrap during parsing. This results in incorrect handling of certificate data. The issue is limited to configurations using the original ASN.1 parsing implementation which is off by default.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-5188

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-5188

wolfssl

Source reference: /affected/0/package/name

Affected versions
5.5.4-2

Source reference: /affected/0/versions

5.5.4-2+deb12u1

Source reference: /affected/0/versions

5.5.4-2+deb12u2

Source reference: /affected/0/versions

5.5.4-2+deb12u3

Source reference: /affected/0/versions

5.5.4-2.1

Source reference: /affected/0/versions

5.6.4-1

Source reference: /affected/0/versions

5.6.4-2

Source reference: /affected/0/versions

5.6.6-1

Source reference: /affected/0/versions

5.6.6-1.1

Source reference: /affected/0/versions

5.6.6-1.2

Source reference: /affected/0/versions

5.6.6-1.3

Source reference: /affected/0/versions

5.6.6-1.3~exp1

Source reference: /affected/0/versions

5.7.0-0.1

Source reference: /affected/0/versions

5.7.0-0.2

Source reference: /affected/0/versions

5.7.0-0.3

Source reference: /affected/0/versions

5.7.2-0.1

Source reference: /affected/0/versions

5.7.2-0.2

Source reference: /affected/0/versions

5.7.2-0.3

Source reference: /affected/0/versions

5.7.2-0.4

Source reference: /affected/0/versions

5.8.2-1

Source reference: /affected/0/versions

5.8.2-1.1

Source reference: /affected/0/versions

5.8.2-1.2

Source reference: /affected/0/versions

5.8.4-1

Source reference: /affected/0/versions

5.9.0-0.1

Source reference: /affected/0/versions

5.9.0-0.2

Source reference: /affected/0/versions

5.9.1-0.1

Source reference: /affected/0/versions

5.9.2-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

wolfssl

Source reference: /affected/1/package/name

Affected versions
5.7.2-0.1

Source reference: /affected/1/versions

5.7.2-0.1+deb13u1

Source reference: /affected/1/versions

5.7.2-0.1+deb13u2

Source reference: /affected/1/versions

5.7.2-0.2

Source reference: /affected/1/versions

5.7.2-0.3

Source reference: /affected/1/versions

5.7.2-0.4

Source reference: /affected/1/versions

5.8.2-1

Source reference: /affected/1/versions

5.8.2-1.1

Source reference: /affected/1/versions

5.8.2-1.2

Source reference: /affected/1/versions

5.8.4-1

Source reference: /affected/1/versions

5.9.0-0.1

Source reference: /affected/1/versions

5.9.0-0.2

Source reference: /affected/1/versions

5.9.1-0.1

Source reference: /affected/1/versions

5.9.2-1

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "wolfssl",
      "purl": "pkg:deb/debian/wolfssl?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "5.5.4-2",
      "5.5.4-2+deb12u1",
      "5.5.4-2+deb12u2",
      "5.5.4-2+deb12u3",
      "5.5.4-2.1",
      "5.6.4-1",
      "5.6.4-2",
      "5.6.6-1",
      "5.6.6-1.1",
      "5.6.6-1.2",
      "5.6.6-1.3",
      "5.6.6-1.3~exp1",
      "5.7.0-0.1",
      "5.7.0-0.2",
      "5.7.0-0.3",
      "5.7.2-0.1",
      "5.7.2-0.2",
      "5.7.2-0.3",
      "5.7.2-0.4",
      "5.8.2-1",
      "5.8.2-1.1",
      "5.8.2-1.2",
      "5.8.4-1",
      "5.9.0-0.1",
      "5.9.0-0.2",
      "5.9.1-0.1",
      "5.9.2-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5188.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "wolfssl",
      "purl": "pkg:deb/debian/wolfssl?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "5.7.2-0.1",
      "5.7.2-0.1+deb13u1",
      "5.7.2-0.1+deb13u2",
      "5.7.2-0.2",
      "5.7.2-0.3",
      "5.7.2-0.4",
      "5.8.2-1",
      "5.8.2-1.1",
      "5.8.2-1.2",
      "5.8.4-1",
      "5.9.0-0.1",
      "5.9.0-0.2",
      "5.9.1-0.1",
      "5.9.2-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5188.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57253 · Revision 1
Added to Heist Feed
Publisher date
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