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CVE-2026-13586

PKCS#12 MAC and bag-decryption KDF iteration-count bound (DoS)

HIGH
7.5
CVSS Score
Published: August 3, 2026 at 02:58 AM UTC
Updated: August 28, 2026 at 05:02 PM UTC
5 products affected across 2 vendorsBc JavaBouncy Castle for Java LtsFips Java API

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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

In Bouncy Castle for Java before 1.85, PKCS#12 MAC and bag-decryption KDF iteration-count bound (DoS). 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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Bc Java· Bouncycastle
95%
v < 1.85
Affected range stops below 1.85, so it looks safe — our inference, not a vendor statement
Bouncy Castle for Java Lts· Bouncycastle
95%
v ≤ 2.73.11
Fips Java API· Bouncycastle
95%
1.0.0 ≤ v < 1.0.2.72.0.0 ≤ v < 2.0.22.1.0 ≤ v < 2.1.3
Affected range stops below 1.0.2.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.3, so it looks safe — our inference, not a vendor statement
Bouncy Castle for Java FIPS (BC-FJA)· Legion of Bouncy Castlemaven
60%
1.0.0 ≤ v < 1.0.2.72.0.0 ≤ v < 2.0.22.1.0 ≤ v < 2.1.31.0.02.0.02.1.0
Affected range stops below 1.0.2.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.3, so it looks safe — our inference, not a vendor statement
BC Java· Legion of Bouncy Castlemaven
60%
v < 1.852.73.0 ≤ v < 2.73.122.73.0
Affected range stops below 1.85, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.73.12, so it looks safe — our inference, not a vendor statement

References (4)

Source: cverecord
https://github.com/bcgit/bc-java/wiki/CVE-2026-13586
Patch
Source: cverecord
https://github.com/bcgit/bc-java/commit/fa59cc23502f73def89d94374540cc92af647b96
Patch
Source: cverecord
https://github.com/bcgit/bc-java/commit/75d60dfb4ca72bea6da96234138bc9b1556ef5b0
Vendor AdvisoryThird Party Advisory
Source: cverecord
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9013586

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-770

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