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CVE-2025-14813: GOSTCTR implementation unable to process more than 255 blocks correctly

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-15 · updated 2026-10-07
• Weakness: CWE-327

Description

: Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcprov on all (core modules). This vulnerability is associated with program files G3413CTRBlockCipher. This issue affects BC-JAVA: from 1.59 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84.

Affected products

• Legion of the Bouncy Castle Inc. BC-JAVA: from 1.59 before 1.80.2; from 1.81 before 1.81.1; from 1.82 before 1.84 — fixed in 1.80.2, 1.81.1, 1.84

How to fix

Upgrade to a fixed version: Legion of the Bouncy Castle Inc. BC-JAVA 1.80.2, 1.81.1, 1.84. Check the vendor advisory for mitigations.

References

• https://github.com/bcgit/bc-java/commit/701686cb0184cd9ae103c801b3581fdf95c6d4f3
• https://github.com/bcgit/bc-java/commit/b42574345414e4b7c8051b16fa1fafe01c29871f
• https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902025%E2%80%9014813
• https://access.redhat.com/errata/RHSA-2026:11720
• https://access.redhat.com/errata/RHSA-2026:11721
• https://access.redhat.com/errata/RHSA-2026:13631
• https://access.redhat.com/errata/RHSA-2026:14272
• https://access.redhat.com/errata/RHSA-2026:14276
• https://access.redhat.com/errata/RHSA-2026:17668
• https://access.redhat.com/errata/RHSA-2026:18054
• https://access.redhat.com/errata/RHSA-2026:18055
• https://access.redhat.com/errata/RHSA-2026:18059

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