Legion of the Bouncy Castle BC-LTS up to 2.73.12.0 SHA3 SHAKE native_c/arm/sha/shake.C out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k3.60

Summaryinfo

A vulnerability classified as critical has been found in Legion of the Bouncy Castle BC-LTS up to 2.73.12.0. This vulnerability affects unknown code of the file native_c/arm/sha/shake.C of the component SHA3 SHAKE Handler. The manipulation leads to out-of-bounds write. This vulnerability is traded as CVE-2026-15997. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Legion of the Bouncy Castle BC-LTS up to 2.73.12.0 and classified as critical. This issue affects some unknown processing of the file native_c/arm/sha/shake.C of the component SHA3 SHAKE Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Out-of-bounds write vulnerability in Legion of the Bouncy Castle Inc. BC-LTS bcprov-lts8on on ARM allows Overflow Buffers. This vulnerability is associated with program files https://github.Com/bcgit/bc-lts-java/blob/main/native_c/arm/sha/shake.C, https://github.Com/bcgit/bc-lts-java/blob/main/native_c/arm/sha/sha3.C. This issue affects BC-LTS: from 2.73.0 before 2.73.12.1. Issue is only applicable if application involved is accepting memoable SHA3 / SHAKE states from potentially untrusted sources.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-15997 since 07/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.73.12.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-45068). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: BC-LTS 2.73.12.1

Timelineinfo

07/16/2026 CVE reserved
07/16/2026 +0 days VulDB entry created
07/17/2026 +0 days Advisory disclosed
07/17/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-15997 (🔒)
GCVE (CVE): GCVE-0-2026-15997
GCVE (VulDB): GCVE-100-379679
EUVD: 🔒

Entryinfo

Created: 07/17/2026 00:41
Updated: 07/17/2026 04:48
Changes: 07/17/2026 00:41 (54), 07/17/2026 04:48 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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