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Fencer Vulns
medium 5.3

CVE-2026-58063 json

BCFKS keystore load honours unbounded KDF cost from untrusted file

published 2026-08-03 3 mo ago modified 2026-09-02 2 mo ago also EUVD-2026-52088

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

Summary

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).

Patch / fix

  • Legion of the Bouncy Castle Inc. BC-JAVA 1.85
  • Legion of the Bouncy Castle Inc. BC-LTS-JAVA 2.73.12
  • Legion of the Bouncy Castle Inc. BC-FJA 1.0.2.7, 2.0.2, 2.1.3
  • bouncycastle Debian 14 1.86-1

debian advisories DEBIAN-CVE-2026-58063

  • bouncycastle SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.85-150200.3.38.1
  • bouncycastle SLES 16.0, SLES for SAP applications 16.0 1.85-160000.1.1

suse advisories SUSE-SU-2026:3559-1SUSE-SU-2026:23127-1SUSE-SU-2026:23150-1

  • bouncycastle openSUSE Leap 16.0 1.85-160000.1.1
  • bouncycastle openSUSE Tumbleweed 1.85-1.1

opensuse advisories openSUSE-SU-2026:21538-1openSUSE-SU-2026:11445-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-58063 updated cvss 7.5

org.bouncycastle/bcprov-jdk15on: Bouncy Castle for Java: Denial of Service via unbounded KDF cost in BCFKS keystore load

  • Red Hat Enterprise Linux 9 jmc
    affected: workaround, no fix available
  • Red Hat JBoss Enterprise Application Platform 7 bcprov-jdk15on 1.69 Red Hat Single Sign-On 7 bcprov-jdk15on 1.69
    affected: workaround, no fix planned “Will not fix”
  • Red Hat AMQ Clients bcprov-jdk15on 1.69
    not affected: vulnerable code not in execute path
  • Red Hat Enterprise Linux 8 resteasy, resteasy-javadoc Red Hat Enterprise Linux 9 resteasy, pki-resteasy-core, pki-resteasy-client, pki-resteasy-jackson2-provider, pki-resteasy-servlet-initializer
    not affected: vulnerable code not present
  • Red Hat Fuse 7 bcprov-jdk15on 1.69
    not affected: vulnerable code not in execute path

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.3 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
CNA 4.0 5.3 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/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
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

  • Legion of the Bouncy Castle Inc. BC-JAVA
  • Legion of the Bouncy Castle Inc. BC-LTS-JAVA
  • Legion of the Bouncy Castle Inc. BC-FJA

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.