[NEW] [medium] Bouncy Castle for Java FIPS: Multiple vulnerabilities enable denial of service

mediumCVE-2026-13505 CVE-2026-8798

A remote, anonymous attacker can exploit multiple vulnerabilities in Bouncy Castle for Java FIPS to conduct a denial of service attack.

CSIRTS triage

vendor: Bouncy Castle product: Bouncy Castle for Java FIPS Denial of service

What: Multiple vulnerabilities enable remote denial of service attacks against Bouncy Castle for Java FIPS.
Who is affected: Java applications using Bouncy Castle for Java FIPS cryptographic operations are vulnerable.
Urgency: Medium severity with remote denial of service attacks possible; cryptographic availability is important.
Action: Update Bouncy Castle for Java FIPS to patched version in all dependent applications.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-08-10
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2709

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-135050.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-87980.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-13505	coverage & exploitation status	NVD · CVE.org
CVE-2026-8798	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Bouncy Castle for

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] Bouncy Castle: Multiple vulnerabilitiescert-bund · 2026-08-17
high[UPDATE] [high] Bouncy Castle BC-JAVA: Multiple vulnerabilitiescert-bund · 2026-08-12
unknownCVE-2026-13505: In Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X se…nvd · 2026-08-08
unknownCVE-2026-8798: In Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 2.1.3, the native entropy source used on…nvd · 2026-08-08
unknownCVE-2026-14682: In Bouncy Castle for Java before 1.85, Possible OOM from unbounded up-front allocation on a de…nvd · 2026-08-03
unknownCVE-2026-13586: In Bouncy Castle for Java before 1.85, PKCS#12 MAC and bag-decryption KDF iteration-count boun…nvd · 2026-08-03