CVE catalog

CVE-2026-55894

Capstone is a disassembly framework. In 6.0.0-Alpha9…

[CVE catalog]

Capstone is a disassembly framework. In 6.0.0-Alpha9 and earlier, Capstone's arch/SH/SHDisassembler.c sh_disassemble() function computes an idx value from a raw 16-bit instruction without ensuring it is within the active mode-specific decode[] function-pointer table. An application using CS_ARCH_SH with CS_MODE_SH2A or CS_MODE_SH4A and CS_MODE_SHFPU can pass crafted bytecode through cs_disasm_iter() or cs_disasm(), causing the decode[idx] test to read outside the table and terminate the process with a segmentation fault. No code execution or information disclosure was demonstrated. This issue is fixed in version 6.0.0-Alpha10.

Severity
Medium · CVSS 6.8CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/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
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.19% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [
    {
      "name": "capstone",
      "status": "vulnerable",
      "release": "sid",
      "version": "5.0.9-1"
    },
    {
      "name": "capstone",
      "status": "vulnerable",
      "release": "forky",
      "version": "5.0.9-1"
    },
    {
      "name": "capstone",
      "status": "vulnerable",
      "release": "trixie",
      "version": "5.0.7-1~deb13u1"
    },
    {
      "name": "capstone",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "4.0.2-5"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1145195,
      "name": "capstone",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1145195,
      "name": "capstone",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1145195,
      "name": "capstone",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1145195,
      "name": "capstone",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": []
}

[Debian bug #1145195]

Publisher notes

[trixie] capstone: Minor issue [bookworm] capstone: Minor issue

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [capstone-tool]Unknown

    Source package: [capstone]

    Details (2)

    • 4.0.2-5 · amd64 · bookworm

      Affected

      nvd · capstone · debian · bookworm; nvd · capstone · debian · 12

    • 4.0.2-5 · arm64 · bookworm

      Affected

      nvd · capstone · debian · bookworm; nvd · capstone · debian · 12

  • [libcapstone4]Unknown

    Source package: [capstone]

    Details (2)

    • 4.0.2-5 · amd64 · bookworm

      Affected

      nvd · capstone · debian · bookworm; nvd · capstone · debian · 12

    • 4.0.2-5 · arm64 · bookworm

      Affected

      nvd · capstone · debian · bookworm; nvd · capstone · debian · 12

  • [libcapstone-dev]Unknown

    Source package: [capstone]

    Details (2)

    • 4.0.2-5 · amd64 · bookworm

      Affected

      nvd · capstone · debian · bookworm; nvd · capstone · debian · 12

    • 4.0.2-5 · arm64 · bookworm

      Affected

      nvd · capstone · debian · bookworm; nvd · capstone · debian · 12

  • [python3-capstone]Unknown

    Source package: [capstone]

    Details (2)

    • 4.0.2-5 · amd64 · bookworm

      Affected

      nvd · capstone · debian · bookworm; nvd · capstone · debian · 12

    • 4.0.2-5 · arm64 · bookworm

      Affected

      nvd · capstone · debian · bookworm; nvd · capstone · debian · 12

[Debian 13 (Trixie)]

  • [capstone-tool]Unknown

    Source package: [capstone]

    Details (2)

    • 5.0.7-1~deb13u1 · amd64 · trixie

      Affected

      nvd · capstone · debian · 13

    • 5.0.7-1~deb13u1 · arm64 · trixie

      Affected

      nvd · capstone · debian · 13

  • [libcapstone5]Unknown

    Source package: [capstone]

    Details (2)

    • 5.0.7-1~deb13u1 · amd64 · trixie

      Affected

      nvd · capstone · debian · 13

    • 5.0.7-1~deb13u1 · arm64 · trixie

      Affected

      nvd · capstone · debian · 13

  • [libcapstone-dev]Unknown

    Source package: [capstone]

    Details (2)

    • 5.0.7-1~deb13u1 · amd64 · trixie

      Affected

      nvd · capstone · debian · 13

    • 5.0.7-1~deb13u1 · arm64 · trixie

      Affected

      nvd · capstone · debian · 13

  • [python3-capstone]Unknown

    Source package: [capstone]

    Details (2)

    • 5.0.7-1~deb13u1 · amd64 · trixie

      Affected

      nvd · capstone · debian · 13

    • 5.0.7-1~deb13u1 · arm64 · trixie

      Affected

      nvd · capstone · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]