CVE-2026-58063

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% 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
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In Bouncy Castle for Java before 1.85, BCFKS keystore load honours unbounded KDF cost from untrusted file. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

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
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 4, 2026

Advisory Details (2)

Auto-updated Aug 3, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit 81737a56ef44 (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 81737a56ef44 — awaiting tagged release

https://github.com/bcgit/bc-java/commit/81737a56ef4489da1f849cf549df95e338ea6b06
generic

Home · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE-2026-58063

Vendor Advisories for CVE-2026-58063(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 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
bouncycastle1.68-2 ... 1.80-3 (12 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
bouncycastle1.72-2, 1.77-1, 1.80-1, 1.80-2, 1.80-3——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
bouncycastle1.80-3——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
bouncycastle1.80-3——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 56× 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.

  1. 2026-08-21 06:35 UTCEG score recompute
  2. 2026-08-21 06:35 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 05:36 UTCEG score recompute
  5. 2026-08-20 05:36 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 04:37 UTCEG score recompute
  8. 2026-08-19 04:37 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 03:38 UTCEG score recompute
  11. 2026-08-18 03:38 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 02:39 UTCEG score recompute
  14. 2026-08-17 02:39 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-16 01:40 UTCEG score recompute
  18. 2026-08-16 01:40 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-15 00:41 UTCGHSA enrichment
  21. 2026-08-13 23:42 UTCEG score recompute
  22. 2026-08-13 23:42 UTCGHSA enrichment
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-12 22:43 UTCEG score recompute
  25. 2026-08-12 22:43 UTCGHSA enrichment
Show 31 more
  1. 2026-08-12 13:51 UTCEPSS rescore
  2. 2026-08-11 21:44 UTCEG score recompute
  3. 2026-08-11 21:44 UTCGHSA enrichment
  4. 2026-08-11 00:00 UTCEPSS rescore
  5. 2026-08-10 20:46 UTCGHSA enrichment
  6. 2026-08-09 19:47 UTCEG score recompute
  7. 2026-08-09 19:47 UTCGHSA enrichment
  8. 2026-08-09 13:46 UTCEPSS rescore
  9. 2026-08-08 18:49 UTCEG score recompute
  10. 2026-08-08 18:49 UTCGHSA enrichment
  11. 2026-08-08 16:37 UTCEPSS rescore
  12. 2026-08-07 17:50 UTCEG score recompute
  13. 2026-08-07 17:50 UTCGHSA enrichment
  14. 2026-08-06 16:51 UTCEG score recompute
  15. 2026-08-06 16:51 UTCGHSA enrichment
  16. 2026-08-06 13:47 UTCEPSS rescore
  17. 2026-08-05 19:17 UTCEPSS rescore
  18. 2026-08-05 15:52 UTCEG score recompute
  19. 2026-08-05 15:52 UTCGHSA enrichment
  20. 2026-08-04 15:10 UTCEPSS rescore
  21. 2026-08-04 14:54 UTCEG score recompute
  22. 2026-08-04 14:54 UTCGHSA enrichment
  23. 2026-08-04 10:39 UTCEPSS rescore
  24. 2026-08-03 17:40 UTCEG score recompute
  25. 2026-08-03 17:40 UTCGHSA enrichment
  26. 2026-08-03 16:19 UTCEG score recompute
  27. 2026-08-03 16:19 UTCGHSA enrichment
  28. 2026-08-03 07:29 UTCGHSA enrichment
  29. 2026-08-03 03:24 UTCEG score recompute
  30. 2026-08-03 02:44 UTCEG score recompute
  31. 2026-08-03 02:43 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-58063?
CVE-2026-58063 is a medium vulnerability published on August 3, 2026. In Bouncy Castle for Java before 1.85, BCFKS keystore load honours unbounded KDF cost from untrusted file. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).
When was CVE-2026-58063 disclosed?
CVE-2026-58063 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58063 actively exploited?
CVE-2026-58063 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 74.1% of all scored CVEs.
What is the CVSS score of CVE-2026-58063?
CVE-2026-58063 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-58063?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58063, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-58063

Explore →

Is Your Infrastructure Affected by CVE-2026-58063?

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

Start Free Scan →Browse All CVEs