Upstream information
Description
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.SUSE information
Overall state of this security issue: Resolved
This issue is currently rated as having moderate severity.
| CVSS detail | SUSE |
|---|---|
| Base Score | 4.4 |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality Impact | None |
| Integrity Impact | Low |
| Availability Impact | Low |
| CVSSv3 Version | 3.1 |
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 2 | 2 |
| Vector | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N |
| Attack Vector | Local | Local |
| Attack Complexity | Low | Low |
| Attack Requirements | Present | Present |
| Privileges Required | None | None |
| User Interaction | Passive | Passive |
| Vulnerable System Confidentiality Impact | None | None |
| Vulnerable System Integrity Impact | Low | Low |
| Vulnerable System Availability Impact | Low | Low |
| Subsequent System Confidentiality Impact | None | None |
| Subsequent System Integrity Impact | None | None |
| Subsequent System Availability Impact | None | None |
| CVSSv4 Version | 4.0 | 4.0 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP7 | capstone | Not affected |
| SUSE Linux Enterprise Micro 5.5 | capstone | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | capstone | Not affected |
| SUSE Linux Enterprise Server 15 SP7 | capstone | Not affected |
| SUSE Linux Enterprise Server 16.0 | capstone | Not affected |
| SUSE Linux Enterprise Server 16.1 | capstone | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | capstone | Not affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | capstone | Not affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | capstone | Not affected |
| SUSE Linux Micro 6.0 | capstone | Not affected |
| SUSE Linux Micro 6.1 | capstone | Not affected |
| SUSE Linux Micro 6.2 | capstone | Not affected |
| openSUSE Leap 16.0 | capstone | Not affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP5 | capstone | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | capstone | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP5 | capstone | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP6 | capstone | Not affected |
| SUSE Linux Enterprise Server 15 SP5 | capstone | Not affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | capstone | Not affected |
| SUSE Linux Enterprise Server 15 SP6 | capstone | Not affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | capstone | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | capstone | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | capstone | Not affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | capstone | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | capstone | Not affected |
| openSUSE Leap 15.5 | capstone | Not affected |
| openSUSE Leap 15.6 | capstone | Not affected |
| openSUSE Leap Micro 5.5 | capstone | Not affected |
SUSE Timeline for this CVE
CVE page created: Mon Aug 17 16:46:41 2026CVE page last modified: Tue Aug 18 11:36:00 2026