CVE-2026-15997

Native ARM SHA3 / SHAKE `restoreFullState` fails to detect size_t underflow in a crafted encoded state

State: Published
Severity: 1.7 Low
Published: Jul 16, 2026
Updated: Jul 17, 2026
Reserved: Jul 16, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	1.7 Low	CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/S:P/AU:N/R:A/V:D/RE:M/U:Amber	bcorg

Weaknesses

CWE-787 Out-of-bounds write

Affected Products

Product	Versions
BC-LTSLegion of the Bouncy Castle Inc.	2.73.0 to before 2.73.12.1Affected

References

https://github.com/bcgit/bc-lts-java/wiki/CVE-2026-15997

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