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DEBIAN-CVE-2026-8720

Type: advisorySource: OSV1 source record

wc_Blake2bHmacFinal and wc_Blake2sHmacFinal discard the message when the key length exceeds the block size, producing a MAC that is independent of the input. When the supplied key is longer than the BLAKE2 block size the key-hashing branch reinitialized the running hash state, discarding the accumulated message data, so the resulting MAC depended only on the key and not on the message being authenticated. This bug is specific to the HMAC-BLAKE2 APIs that were added in wolfSSL version 5.9.0.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-8720

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-2026-8720

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-2026-8720.json"
    },
    "ecosystem_specific": {
      "urgency": "end-of-life"
    }
  },
  {
    "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-2026-8720.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#58498 · Revision 1
Added to Heist Feed
Publisher date
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