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🛡️ CVE-2026-5598 — bcprov-jdk14

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-385 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Bouncy Castle Has Covert Timing Channel Vulnerability

Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). This vulnerability is associated with program files FrodoEngine.Java.

This issue only affects users of the FrodoKEM algorithm involved in the decryption of encapsulations.

This issue affects BC-JAVA: from 1.71 to 1.80.1, 1.81, 1.82 to 1.83.

Fixed versions: 1.80.2, 1.81.1, 1.84

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

CVE-2026-5598 is classified as CWE-385: Covert Timing Channel. Covert timing channels convey information by modulating some aspect of system behavior over time, so that the program receiving the information can observe system behavior and infer protected information.

Affected software

CVE-2026-5598 is recorded against 4 packages.

  • org.bouncycastle:bcprov-jdk14 (from 1.81 up to 1.81.1)
  • org.bouncycastle:bcprov-jdk15to18 (from 1.71 up to 1.80.2)
  • org.bouncycastle:bcprov-jdk18on (from 1.82 up to 1.84)
  • unknown

Timeline and source

Published on 17 April 2026 and last revised on 19 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)
github.com (Web)

Other advisories for this package

org.bouncycastle:bcprov-jdk14 has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-385: Covert Timing Channel) in other software:

CVE-2026-5598 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-385
Public Exploit ✅ No
Source NVD
Published 2026-04-17
Updated 2026-08-20
Modified 2026-06-19
Fix URL N/A

Affected Packages

Software From version Fixed in
org.bouncycastle:bcprov-jdk14 1.81 1.81.1
org.bouncycastle:bcprov-jdk15to18 1.71 1.80.2
org.bouncycastle:bcprov-jdk18on 1.82 1.84
unknown — —

Site Security Check

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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