CVE-2026-59642: bouncycastle bc-java
CVSS: 8.7v4.0HighAnalyzed
AliasesUBUNTU-CVE-2026-59642DEBIAN-CVE-2026-59642
Published 03-08-2026Last modified 03-08-2026
Vulnerability summary
CVE-2026-59642 is a high (CVSS 8.7) vulnerability in bouncycastle bc-java. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21.6% of scored vulnerabilities.
CVSS score
8.7/10
010
High · v4.0 (CVE.org)EPSS score
0.30%
0%100%
Low · +0.16 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 5 · Related 5Timeline
- 03-08-2026PublishedVulnerability first disclosed.
- 03-08-2026Last modifiedVulnerability information updated.
Description
In Bouncy Castle for Java before 1.85, CMS AuthenticatedData content not bound to MAC when authAttrs present. 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).
CVSS metrics
6 scores · 4 sources · 2 versionsHigh 8.7Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:AmberSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber
- NVDNIST8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber
High 7.5Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NSourcesAll 3 agree
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
0.30%
Chance of exploitation in the next 30 days
Percentile
22%
Versus all other CVEs
30-day change
+0.16 pp
From 0.15% on 19-09-2026
19-09-202619-10-2026
EPSS score0.30%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Bouncycastle3 products
- bc-java< 1.85
- bcpkix-fips< 1.0.12 | ≥ 2.0.7, < 2.0.12 | ≥ 2.1.8, < 2.1.12
- bouncy_castle_for_java_lts≤ 2.73.11
Legion of the bouncy castle inc.3 products
- bc-fja≥ 1.0.0, < 1.0.12 | ≥ 2.0.0, < 2.0.12 | ≥ 2.1.0, < 2.1.12
- bc-java< 1.85
- bc-lts-java≥ 2.73.0, < 2.73.12
Debian1 product
- bouncycastleAll versions (No fix recorded) | < 1.86-1
Ubuntu1 product
- bouncycastleAll versions (No fix recorded)
4 vendors · 8 products
References
5 links- github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059642Vendor AdvisoryREPORTThird Party Advisory
