CVE-2026-13506

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 82% 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
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: 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, Lazy ASN.1 sequence forcing resets nesting-depth guard. 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
8.7
EG Score
8.7(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity87% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
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 77454da9b3dc (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 77454da9b3dc — awaiting tagged release

https://github.com/bcgit/bc-java/commit/77454da9b3dcaaa2991412d1c3c1a6e1a338ff84
generic

Home · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE-2026-13506

Vendor Advisories for CVE-2026-13506(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 25× in last 7d / 73× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 20:31 UTCGHSA enrichment
  3. 2026-08-20 07:58 UTCGHSA enrichment
  4. 2026-08-19 19:26 UTCEG score recompute
  5. 2026-08-19 19:26 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 06:53 UTCGHSA enrichment
  8. 2026-08-18 18:21 UTCEG score recompute
  9. 2026-08-18 18:21 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 05:07 UTCGHSA enrichment
  12. 2026-08-17 16:33 UTCEG score recompute
  13. 2026-08-17 16:33 UTCGHSA enrichment
  14. 2026-08-17 03:48 UTCGHSA enrichment
  15. 2026-08-16 15:15 UTCEG score recompute
  16. 2026-08-16 15:15 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 02:43 UTCEG score recompute
  19. 2026-08-16 02:43 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 14:11 UTCGHSA enrichment
  22. 2026-08-15 01:38 UTCEG score recompute
  23. 2026-08-15 01:38 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 13:06 UTCGHSA enrichment
Show 48 more
  1. 2026-08-14 00:34 UTCEG score recompute
  2. 2026-08-14 00:34 UTCGHSA enrichment
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-13 12:01 UTCGHSA enrichment
  5. 2026-08-12 23:29 UTCEG score recompute
  6. 2026-08-12 23:29 UTCGHSA enrichment
  7. 2026-08-12 13:50 UTCEPSS rescore
  8. 2026-08-12 10:57 UTCGHSA enrichment
  9. 2026-08-11 22:25 UTCEG score recompute
  10. 2026-08-11 22:25 UTCGHSA enrichment
  11. 2026-08-11 13:42 UTCEPSS rescore
  12. 2026-08-11 09:52 UTCEG score recompute
  13. 2026-08-11 09:52 UTCGHSA enrichment
  14. 2026-08-10 23:59 UTCEPSS rescore
  15. 2026-08-10 21:20 UTCGHSA enrichment
  16. 2026-08-10 08:48 UTCGHSA enrichment
  17. 2026-08-09 20:16 UTCEG score recompute
  18. 2026-08-09 20:16 UTCGHSA enrichment
  19. 2026-08-09 13:46 UTCEPSS rescore
  20. 2026-08-09 07:44 UTCGHSA enrichment
  21. 2026-08-08 19:12 UTCEG score recompute
  22. 2026-08-08 19:12 UTCGHSA enrichment
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-08 06:40 UTCGHSA enrichment
  25. 2026-08-07 18:08 UTCEG score recompute
  26. 2026-08-07 18:08 UTCGHSA enrichment
  27. 2026-08-07 05:35 UTCGHSA enrichment
  28. 2026-08-06 17:03 UTCEG score recompute
  29. 2026-08-06 17:03 UTCGHSA enrichment
  30. 2026-08-06 13:46 UTCEPSS rescore
  31. 2026-08-06 04:30 UTCEG score recompute
  32. 2026-08-06 04:30 UTCGHSA enrichment
  33. 2026-08-05 19:17 UTCEPSS rescore
  34. 2026-08-05 15:58 UTCGHSA enrichment
  35. 2026-08-05 03:26 UTCEG score recompute
  36. 2026-08-05 03:26 UTCGHSA enrichment
  37. 2026-08-04 15:09 UTCEPSS rescore
  38. 2026-08-04 14:54 UTCEG score recompute
  39. 2026-08-04 14:54 UTCGHSA enrichment
  40. 2026-08-04 10:38 UTCEPSS rescore
  41. 2026-08-04 05:11 UTCGHSA enrichment
  42. 2026-08-03 16:36 UTCEG score recompute
  43. 2026-08-03 16:36 UTCGHSA enrichment
  44. 2026-08-03 15:28 UTCEG score recompute
  45. 2026-08-03 15:28 UTCGHSA enrichment
  46. 2026-08-03 04:18 UTCEG score recompute
  47. 2026-08-03 04:03 UTCEG score recompute
  48. 2026-08-03 04:03 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-13506?
CVE-2026-13506 is a high vulnerability published on August 3, 2026. In Bouncy Castle for Java before 1.85, Lazy ASN.1 sequence forcing resets nesting-depth guard. 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-2026-13506 disclosed?
CVE-2026-13506 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-2026-13506 actively exploited?
CVE-2026-13506 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 81.8% of all scored CVEs.
What is the CVSS score of CVE-2026-13506?
CVE-2026-13506 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-13506?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13506, 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-2026-13506

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