CVE-2026-55894

MEDIUMPre-NVD 6.86.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (8th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this weekElevated
6.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity68% × 45%
The EG Score, 6.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 20, 2026

Last Modified

September 18, 2026

Advisory Details (6)

Auto-updated Aug 20, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
GitHub release Patch Available

6.0.0-Alpha10

Patch available: capstone-engine/capstone 6.0.0-Alpha10

https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10
GitHub commit

commit e17ee44a8307 (capstone-engine/capstone)

Fix landed in capstone-engine/capstone commit e17ee44a8307 — awaiting tagged release

https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed
GitHub commit

commit 09e76802380b (capstone-engine/capstone)

Fix landed in capstone-engine/capstone commit 09e76802380b — awaiting tagged release

https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e
GitHub pull request

V5: Fix OOB reads/writes - CVE-2026-55893 & CVE-2026-55894

Fix merged in capstone-engine/capstone PR #2969 on 2026-06-18 — awaiting tagged release

https://github.com/capstone-engine/capstone/pull/2969
GitHub pull request

Fix OOB reads/writes - CVE-2026-55893 & CVE-2026-55894

Fix merged in capstone-engine/capstone PR #2968 on 2026-06-18 — awaiting tagged release

https://github.com/capstone-engine/capstone/pull/2968
GitHub advisoryMentions a patch (unverified)

Capstone SH disassembler `sh_disassemble` out-of-bounds read via crafted SH2A bytecode · Advisory · capstone-engine/capstone · GitHub

https://github.com/capstone-engine/capstone/security/advisories/GHSA-gf2c-xwcp-hvf4

Vendor Advisories for CVE-2026-55894(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatcapstone-main-5.0.8-0.3.hum12026-08-25redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
capstone4.0.2-5 ... 5.0.9-1 (11 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
capstone5.0.6-1, 5.0.7-1, 5.0.7-1~deb13u1, 5.0.7-2, 5.0.9-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
capstone5.0.6-1, 5.0.7-1, 5.0.7-1~deb13u1, 5.0.7-2, 5.0.9-1
  • every version on: no fix on record
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 71× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 132 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 35 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  10. 2026-10-09 08:15 UTCEG score recompute
  11. 2026-10-09 08:15 UTCVendor advisory
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  13. 2026-10-08 05:12 UTCEG score recompute
  14. 2026-10-08 05:12 UTCVendor advisory
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  16. 2026-10-07 03:49 UTCEG score recompute
  17. 2026-10-07 03:49 UTCVendor advisory
  18. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  19. 2026-10-06 03:12 UTCVendor advisory
  20. 2026-10-06 03:12 UTCVendor advisory
  21. 2026-10-06 03:12 UTCVendor advisory
  22. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  23. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  24. 2026-10-04 20:51 UTCVendor advisory
  25. 2026-10-03 16:46 UTCEG score recompute
Show 72 more
  1. 2026-10-03 16:46 UTCVendor advisory
  2. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  3. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  4. 2026-10-02 08:40 UTCEG score recompute
  5. 2026-10-02 08:40 UTCVendor advisory
  6. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  7. 2026-10-01 08:25 UTCEG score recompute
  8. 2026-10-01 08:25 UTCVendor advisory
  9. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  10. 2026-09-30 08:08 UTCEG score recompute
  11. 2026-09-30 08:08 UTCVendor advisory
  12. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  13. 2026-09-29 03:24 UTCEG score recompute
  14. 2026-09-29 03:24 UTCVendor advisory
  15. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  16. 2026-09-28 03:08 UTCEG score recompute
  17. 2026-09-28 03:08 UTCVendor advisory
  18. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  19. 2026-09-27 02:53 UTCEG score recompute
  20. 2026-09-27 02:53 UTCVendor advisory
  21. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  22. 2026-09-25 00:40 UTCEG score recompute
  23. 2026-09-25 00:40 UTCVendor advisory
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  25. 2026-09-23 21:39 UTCEG score recompute
  26. 2026-09-23 21:39 UTCVendor advisory
  27. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  28. 2026-09-22 21:23 UTCEG score recompute
  29. 2026-09-22 21:23 UTCVendor advisory
  30. 2026-09-21 21:07 UTCVendor advisory
  31. 2026-09-20 20:51 UTCEG score recompute
  32. 2026-09-20 20:51 UTCVendor advisory
  33. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  34. 2026-09-19 20:35 UTCEG score recompute
  35. 2026-09-19 20:35 UTCVendor advisory
  36. 2026-09-18 20:19 UTCEG score recompute
  37. 2026-09-18 20:19 UTCVendor advisory
  38. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  39. 2026-09-18 04:16 UTCVendor advisory
  40. 2026-09-17 04:00 UTCEG score recompute
  41. 2026-09-17 04:00 UTCVendor advisory
  42. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  43. 2026-09-16 03:44 UTCVendor advisory
  44. 2026-09-15 03:28 UTCEG score recompute
  45. 2026-09-15 03:28 UTCVendor advisory
  46. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  47. 2026-09-14 03:12 UTCEG score recompute
  48. 2026-09-14 03:12 UTCVendor advisory
  49. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  50. 2026-09-13 02:57 UTCEG score recompute
  51. 2026-09-13 02:57 UTCVendor advisory
  52. 2026-09-12 02:41 UTCEG score recompute
  53. 2026-09-12 02:41 UTCVendor advisory
  54. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  55. 2026-09-11 02:24 UTCEG score recompute
  56. 2026-09-11 02:24 UTCVendor advisory
  57. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  58. 2026-09-10 02:08 UTCVendor advisory
  59. 2026-09-09 01:53 UTCEG score recompute
  60. 2026-09-09 01:53 UTCVendor advisory
  61. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-09-08 00:46 UTCEG score recompute
  63. 2026-09-08 00:46 UTCVendor advisory
  64. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  65. 2026-09-07 00:29 UTCEG score recompute
  66. 2026-09-07 00:29 UTCVendor advisory
  67. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  68. 2026-09-06 00:08 UTCEG score recompute
  69. 2026-09-06 00:08 UTCVendor advisory
  70. 2026-09-04 23:51 UTCEG score recompute
  71. 2026-09-04 23:51 UTCVendor advisory
  72. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile

Related CVEs(same product + same vendor + same CWE)

Same vendor

1 shown

redhat:RHSA-2026:59419

Frequently asked(5)

What is CVE-2026-55894?
CVE-2026-55894 is a medium-severity vulnerability; its CVE record was published on August 20, 2026. Capstone is a disassembly framework. In 6.0.0-Alpha9 and earlier, Capstone's arch/SH/SHDisassembler.c shdisassemble() 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 CSARCHSH…
When was the CVE record for CVE-2026-55894 published?
The CVE record for CVE-2026-55894 was published on August 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-55894 actively exploited?
CVE-2026-55894 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55894?
CVE-2026-55894 has a CVSS base score of 6.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55894?
A fix for CVE-2026-55894 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55894 are linked in the Vendor Advisories panel on this page.

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