CVE-2026-58063: bouncycastle bc-java
CVSS: 5.3v4.0MediumAnalyzed
AliasesUBUNTU-CVE-2026-58063DEBIAN-CVE-2026-58063CGA-cmp6-7rx3-5ghmCGA-m92c-673v-fp2q
Published 03-08-2026Last modified 03-08-2026
Vulnerability summary
CVE-2026-58063 is a medium (CVSS 5.3) vulnerability in bouncycastle bc-java. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 35.1% of scored vulnerabilities.
CVSS score
5.3/10
010
Medium · v4.0 (CVE.org)EPSS score
0.42%
0%100%
Low · +0.06 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 6Timeline
- 03-08-2026PublishedVulnerability first disclosed.
- 03-08-2026Last modifiedVulnerability information updated.
Description
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 metrics
7 scores · 5 sources · 2 versionsMedium 5.3Preferred score · CVE.org (CNA)
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:AmberSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS: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
- OSV · ChainguardEcosystem advisory · calculated5.3MediumCVSS: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
- NVDNIST5.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/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
Medium 5.3Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LSourcesAll 3 agree
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS trend
Probability
0.42%
Chance of exploitation in the next 30 days
Percentile
35%
Versus all other CVEs
30-day change
+0.06 pp
From 0.36% on 18-09-2026
18-09-202618-10-2026
EPSS score0.42%
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
- bouncy_castle_for_java_lts≤ 2.73.11
- fips_java_api≥ 1.0.0, < 1.0.2.7 | ≥ 2.0.0, < 2.0.2 | ≥ 2.1.0, < 2.1.3
Legion of the bouncy castle inc.3 products
- bc-fja≥ 1.0.0, < 1.0.2.7 | ≥ 2.0.0, < 2.0.2 | ≥ 2.1.0, < 2.1.3
- bc-java< 1.85
- bc-lts-java≥ 2.73.0, < 2.73.12
Chainguard1 product
- bouncycastle-fips< 2.1.3-r0
Debian1 product
- bouncycastleAll versions (No fix recorded) | < 1.86-1
Ubuntu1 product
- bouncycastleAll versions (No fix recorded)
5 vendors · 9 products
References
12 links- github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9058063Vendor AdvisoryREPORTAdvisoryThird Party AdvisoryPatch
Show all 12 references
- github.com/bcgit/bc-javaPACKAGE
- github.com/bcgit/bc-lts-javaPACKAGE