DEBIAN-CVE-2026-49263
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.
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/versions4.0.2-5.1Source reference:
/affected/0/versions5.0-1~exp1Source reference:
/affected/0/versions5.0.1-1~exp1Source reference:
/affected/0/versions5.0.3-1Source reference:
/affected/0/versions5.0.5-1Source reference:
/affected/0/versions5.0.6-1Source reference:
/affected/0/versions5.0.7-1Source reference:
/affected/0/versions5.0.7-1~deb13u1Source reference:
/affected/0/versions5.0.7-2Source reference:
/affected/0/versions5.0.9-1Source 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/versions5.0.7-1Source reference:
/affected/1/versions5.0.7-1~deb13u1Source reference:
/affected/1/versions5.0.7-2Source reference:
/affected/1/versions5.0.9-1Source 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/versions5.0.7-1Source reference:
/affected/2/versions5.0.7-1~deb13u1Source reference:
/affected/2/versions5.0.7-2Source reference:
/affected/2/versions5.0.9-1Source 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
- Added to Heist Feed
- Publisher date