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DEBIAN-CVE-2026-49263

Type: advisorySource: OSV1 source record

Capstone is a disassembly framework. Prior to version 6.0.0-Alpha9, Capstone's WebAssembly backend accepts attacker-controlled raw WASM instruction bytes through the public `cs_disasm()` and `cs_disasm_iter()` APIs. For a large but well-formed `br_table` instruction, the WASM decoder accumulates the immediate length in a wider local variable but returns it through a `uint16_t` instruction-size path. When the encoded instruction length is exactly 65,536 bytes, the size wraps to zero and `cs_disasm()` can repeatedly decode the same instruction without advancing. For larger lengths, `cs_disasm_iter()` advances into the middle of the `br_table` payload and decodes target bytes as subsequent instructions. This is an availability and parser-integrity issue. Version 6.0.0-Alpha9 patches the issue.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-49263

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-2026-49263

capstone

Source reference: /affected/0/package/name

Affected versions
4.0.2-5

Source reference: /affected/0/versions

4.0.2-5.1

Source reference: /affected/0/versions

5.0-1~exp1

Source reference: /affected/0/versions

5.0.1-1~exp1

Source reference: /affected/0/versions

5.0.3-1

Source reference: /affected/0/versions

5.0.5-1

Source reference: /affected/0/versions

5.0.6-1

Source reference: /affected/0/versions

5.0.7-1

Source reference: /affected/0/versions

5.0.7-1~deb13u1

Source reference: /affected/0/versions

5.0.7-2

Source reference: /affected/0/versions

5.0.9-1

Source reference: /affected/0/versions

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

capstone

Source reference: /affected/1/package/name

Affected versions
5.0.6-1

Source reference: /affected/1/versions

5.0.7-1

Source reference: /affected/1/versions

5.0.7-1~deb13u1

Source reference: /affected/1/versions

5.0.7-2

Source reference: /affected/1/versions

5.0.9-1

Source reference: /affected/1/versions

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

capstone

Source reference: /affected/2/package/name

Affected versions
5.0.6-1

Source reference: /affected/2/versions

5.0.7-1

Source reference: /affected/2/versions

5.0.7-1~deb13u1

Source reference: /affected/2/versions

5.0.7-2

Source reference: /affected/2/versions

5.0.9-1

Source reference: /affected/2/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": "capstone",
      "purl": "pkg:deb/debian/capstone?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "4.0.2-5",
      "4.0.2-5.1",
      "5.0-1~exp1",
      "5.0.1-1~exp1",
      "5.0.3-1",
      "5.0.5-1",
      "5.0.6-1",
      "5.0.7-1",
      "5.0.7-1~deb13u1",
      "5.0.7-2",
      "5.0.9-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49263.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "capstone",
      "purl": "pkg:deb/debian/capstone?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "5.0.6-1",
      "5.0.7-1",
      "5.0.7-1~deb13u1",
      "5.0.7-2",
      "5.0.9-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49263.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "capstone",
      "purl": "pkg:deb/debian/capstone?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "5.0.6-1",
      "5.0.7-1",
      "5.0.7-1~deb13u1",
      "5.0.7-2",
      "5.0.9-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49263.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57734 · Revision 1
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Publisher date
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