CVE-2026-14682Network attack vector

Application crash via oversized ASN.1 length allocation

Published Aug 3, 2026 · Updated Aug 3, 2026

Resource exhaustion in affected Bouncy Castle Java libraries allows remote attackers to crash applications via crafted ASN.1 input. DefiniteLengthInputStream.toByteArray() allocates the entire declared definite-length object before reading any content from a raw stream. Reachability requires a consuming application to parse attacker-controlled ASN.1; affected releases are Java before 1.85, Java LTS before 2.73.12, and FIPS bc-fips before 1.0.2.7, 2.0.2, or 2.1.3 and bctls-fips before 1.0.24.

CVSS severity8.7
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in affected Bouncy Castle Java libraries allows remote attackers to crash applications via crafted ASN.1 input. DefiniteLengthInputStream.toByteArray() allocates the entire declared definite-length object before reading any content from a raw stream. Reachability requires a consuming application to parse attacker-controlled ASN.1; affected releases are Java before 1.85, Java LTS before 2.73.12, and FIPS bc-fips before 1.0.2.7, 2.0.2, or 2.1.3 and bctls-fips before 1.0.24.

The record

CVE
CVE-2026-14682
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
Legion of the Bouncy Castle Inc.
Product
Bouncy Castle Java
Classifications
CWE-789, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=0 <1.85

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Legion of the Bouncy Castle Inc. · Bouncy Castle Javaversion=0 <1.85
Legion of the Bouncy Castle Inc. · Bouncy Castle FIPS Java APIversion=1.0.0 <1.0.24; version=1.0.0 <1.0.2.7; version=2.0.0 <2.0.2; version=2.1.0 <2.1.3
Legion of the Bouncy Castle Inc. · Bouncy Castle Java LTSversion=2.73.0 <2.73.12

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
7.5National Vulnerability DatabaseCVSS: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
T1499Endpoint Denial of Service

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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