CVE-2026-3505Network attack vector

Pre-auth JVM memory exhaustion via AEAD chunk size

Published Apr 15, 2026 · Updated Apr 15, 2026

Uncontrolled resource consumption in Bouncy Castle Java bcpg allows remote attackers to exhaust JVM memory via crafted PGP AEAD data. AEADEncDataPacket accepts an encoded chunk-size byte outside RFC 9580's 0–16 range, while the AEAD helpers derive a chunk length by shifting with that unvalidated value. No credentials or user interaction are required when an application processes attacker-supplied OpenPGP data; exhaustion interrupts the hosting JVM without reported confidentiality or integrity impact.

CVSS severity8.7
High
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Bouncy Castle Java bcpg allows remote attackers to exhaust JVM memory via crafted PGP AEAD data. AEADEncDataPacket accepts an encoded chunk-size byte outside RFC 9580's 0–16 range, while the AEAD helpers derive a chunk length by shifting with that unvalidated value. No credentials or user interaction are required when an application processes attacker-supplied OpenPGP data; exhaustion interrupts the hosting JVM without reported confidentiality or integrity impact.

The record

CVE
CVE-2026-3505
Published
Apr 15, 2026
Updated
Apr 15, 2026
Vendor
Legion of the Bouncy Castle Inc.
Product
Bouncy Castle Java
Classifications
CWE-400, CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.74 <1.84

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Legion of the Bouncy Castle Inc. · Bouncy Castle Javaversion=1.74 <1.84

Published CVSS scores

8.7Legion of the Bouncy Castle Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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