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CVE-2026-3505: Unbounded PGP AEAD chunk size leads to pre-auth resource exhaustion.

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-15 · updated 2026-10-26
• Weakness: CWE-400

Description

Allocation of resources without limits or throttling, Uncontrolled Resource Consumption vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpg on all (pg modules). This vulnerability is associated with program files AEADEncDataPacket.Java, BcAEADUtil.Java, JceAEADUtil.Java, OperatorHelper.Java. This issue affects BC-JAVA: from 1.74 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 1.74 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/dc7530939ffb6cdb57636f3609d98e23b94e71c1
• https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%903505
• https://access.redhat.com/errata/RHSA-2026:13631
• 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
• https://access.redhat.com/errata/RHSA-2026:53644
• https://access.redhat.com/errata/RHSA-2026:53645
• https://access.redhat.com/errata/RHSA-2026:53646
• https://access.redhat.com/errata/RHSA-2026:60239
• https://access.redhat.com/errata/RHSA-2026:60246

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