CVE-2026-54496

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 78% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad 5.0.0, halo2_gadgets 0.5.0, orchard 0.14.0, zcash_primitives 0.28.0, and zcashd 6.20.0, the variable-base scalar multiplication gadget in halo2_gadgets/src/ecc/chip/mul/incomplete.rs used assign_advice() for the base point without a copy constraint tying it to the actual base, allowing a malicious prover to produce a valid proof for an Orchard Action with an under-constrained base point and bypass the diversified-address-integrity check that binds pk_d, g_d, ivk, the nullifier (nf), and the spend validating key (ak) to the note being spent. This issue is fixed in zebrad 5.0.0, halo2_gadgets 0.5.0, orchard 0.14.0, zcash_primitives 0.28.0, and zcashd 6.20.0.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

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
Severity93% × 45%
Exploitation0% × 40%
Automatability100% × 15%
EPSS PROB
0.3%
EPSS %ILE
22nd
KEV
Not listed

Published

July 6, 2026

Last Modified

July 17, 2026

Advisory Details (4)

Auto-updated Oct 8, 2026
Patch available. Sources: github_release, github.
generic

Zebra 4.5.3 and 5.0.0: Emergency Soft Fork and NU6.2 Activation - Zcash Foundation

https://zfnd.org/zebra-4-5-3-and-5-0-0-emergency-soft-fork-and-nu6-2-activation
github_release Patch Available

v6.20.0

Patch available: zcash/zcash v6.20.0

https://github.com/zcash/zcash/releases/tag/v6.20.0
githubMentions a patch (unverified)

Missing copy constraint in halo2_gadgets variable-base scalar multiplication allows under-constrained base, breaking Orchard Action circuit soundness · Advisory · ZcashFoundation/zebra · GitHub

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-ww9q-8r59-xv46
github_release Patch Available

Zebra 5.0.0 (NU6.2)

Patch available: ZcashFoundation/zebra v5.0.0

https://github.com/ZcashFoundation/zebra/releases/tag/v5.0.0

Vendor Advisories for CVE-2026-54496(1)

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

Affected Packages

(4 across 1 ecosystem)
crates.io(4)
PackageVulnerable rangeFix by version rangeDependents
halo2_gadgets—
  • every version up to 0.5.0: fixed in 0.5.0
—
orchard—
  • every version up to 0.14.0: fixed in 0.14.0
—
zcash_primitives—
  • every version up to 0.28.0: fixed in 0.28.0
—
zebrad—
  • every version up to 5.0.0: fixed in 5.0.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 119 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-03 14:26 UTCEPSS rescore
  7. 2026-10-02 17:56 UTCEPSS rescore
  8. 2026-10-01 19:50 UTCEPSS rescore
  9. 2026-09-30 15:03 UTCEPSS rescore
  10. 2026-09-29 15:22 UTCEPSS rescore
  11. 2026-09-28 13:51 UTCEPSS rescore
  12. 2026-09-28 13:40 UTCEG score recompute
  13. 2026-09-27 13:48 UTCEPSS rescore
  14. 2026-09-26 15:59 UTCEPSS rescore
  15. 2026-09-24 14:04 UTCEPSS rescore
  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-23 06:21 UTCEG score recompute
  18. 2026-09-20 20:16 UTCEPSS rescore
  19. 2026-09-18 19:28 UTCEPSS rescore
  20. 2026-09-18 05:57 UTCEG score recompute
  21. 2026-09-17 19:31 UTCEPSS rescore
  22. 2026-09-16 14:08 UTCEPSS rescore
  23. 2026-09-16 05:15 UTCEPSS rescore
  24. 2026-09-15 03:11 UTCEPSS rescore
  25. 2026-09-13 23:55 UTCEG score recompute
Show 75 more
  1. 2026-09-13 16:47 UTCEPSS rescore
  2. 2026-09-13 08:36 UTCEG score recompute
  3. 2026-09-12 03:48 UTCEG score recompute
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-10 09:35 UTCEPSS rescore
  6. 2026-09-08 22:01 UTCEPSS rescore
  7. 2026-09-07 16:01 UTCEPSS rescore
  8. 2026-09-06 14:10 UTCEG score recompute
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-05 22:57 UTCEG score recompute
  11. 2026-09-04 05:06 UTCEPSS rescore
  12. 2026-09-02 14:12 UTCEPSS rescore
  13. 2026-09-01 13:54 UTCEPSS rescore
  14. 2026-09-01 04:40 UTCEPSS rescore
  15. 2026-08-30 20:45 UTCEG score recompute
  16. 2026-08-30 19:17 UTCEPSS rescore
  17. 2026-08-30 07:58 UTCEG score recompute
  18. 2026-08-30 01:22 UTCEPSS rescore
  19. 2026-08-28 21:41 UTCEPSS rescore
  20. 2026-08-27 21:57 UTCEG score recompute
  21. 2026-08-27 14:25 UTCEPSS rescore
  22. 2026-08-27 02:05 UTCEG score recompute
  23. 2026-08-26 14:46 UTCEPSS rescore
  24. 2026-08-25 15:59 UTCEG score recompute
  25. 2026-08-25 13:49 UTCEPSS rescore
  26. 2026-08-24 20:44 UTCEG score recompute
  27. 2026-08-24 09:54 UTCEG score recompute
  28. 2026-08-23 01:57 UTCEG score recompute
  29. 2026-08-23 00:19 UTCEPSS rescore
  30. 2026-08-22 04:46 UTCEG score recompute
  31. 2026-08-21 23:49 UTCEPSS rescore
  32. 2026-08-20 23:22 UTCEG score recompute
  33. 2026-08-20 22:55 UTCEPSS rescore
  34. 2026-08-20 02:24 UTCEG score recompute
  35. 2026-08-19 17:04 UTCEPSS rescore
  36. 2026-08-18 20:48 UTCEG score recompute
  37. 2026-08-18 13:48 UTCEPSS rescore
  38. 2026-08-17 14:54 UTCEG score recompute
  39. 2026-08-17 13:47 UTCEPSS rescore
  40. 2026-08-16 15:47 UTCEG score recompute
  41. 2026-08-16 14:56 UTCEPSS rescore
  42. 2026-08-16 04:15 UTCEG score recompute
  43. 2026-08-16 02:14 UTCEPSS rescore
  44. 2026-08-15 05:04 UTCEG score recompute
  45. 2026-08-15 01:30 UTCEPSS rescore
  46. 2026-08-14 01:46 UTCEG score recompute
  47. 2026-08-13 22:00 UTCEPSS rescore
  48. 2026-08-12 15:08 UTCEG score recompute
  49. 2026-08-12 13:51 UTCEPSS rescore
  50. 2026-08-11 15:59 UTCEG score recompute
  51. 2026-08-11 00:35 UTCEG score recompute
  52. 2026-08-11 00:00 UTCEPSS rescore
  53. 2026-08-09 16:28 UTCEG score recompute
  54. 2026-08-09 13:46 UTCEPSS rescore
  55. 2026-08-08 17:23 UTCEG score recompute
  56. 2026-08-08 16:37 UTCEPSS rescore
  57. 2026-08-07 18:19 UTCEG score recompute
  58. 2026-08-06 15:07 UTCEG score recompute
  59. 2026-08-06 13:47 UTCEPSS rescore
  60. 2026-08-05 19:48 UTCEG score recompute
  61. 2026-08-05 19:17 UTCEPSS rescore
  62. 2026-08-04 18:16 UTCEG score recompute
  63. 2026-08-04 15:10 UTCEPSS rescore
  64. 2026-08-04 13:47 UTCEG score recompute
  65. 2026-08-04 10:39 UTCEPSS rescore
  66. 2026-08-03 12:57 UTCEG score recompute
  67. 2026-08-03 10:36 UTCEPSS rescore
  68. 2026-08-02 04:53 UTCEG score recompute
  69. 2026-08-02 02:27 UTCEPSS rescore
  70. 2026-08-01 05:47 UTCEG score recompute
  71. 2026-08-01 04:16 UTCEPSS rescore
  72. 2026-07-30 17:16 UTCEG score recompute
  73. 2026-07-30 16:28 UTCEPSS rescore
  74. 2026-07-30 12:52 UTCEG score recompute
  75. 2026-07-30 05:08 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-54496?
CVE-2026-54496 is a critical vulnerability published on July 6, 2026. ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad 5.0.0, halo2gadgets 0.5.0, orchard 0.14.0, zcashprimitives 0.28.0, and zcashd 6.20.0, the variable-base scalar multiplication gadget in halo2gadgets/src/ecc/chip/mul/incomplete.rs used assignadvice() for the base point without a copy…
When was CVE-2026-54496 disclosed?
CVE-2026-54496 was first published on July 6, 2026, with the most recent update on July 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54496 actively exploited?
CVE-2026-54496 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54496?
CVE-2026-54496 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54496?
A fix for CVE-2026-54496 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54496 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-54496

Explore →

Is Your Infrastructure Affected by CVE-2026-54496?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs