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CVE-2026-15997

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

LOW
1.7
CVSS Score
Published: July 16, 2026 at 10:17 PM UTC
Updated: October 24, 2026 at 08:10 PM UTC
1 product affected across 1 vendorBouncy Castle for Java LTS (BC-LTS)

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Severity
LOW1.7
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Bouncy Castle for Java LTS (BC-LTS)· Legion of Bouncy Castlemaven
90%
2.73.0 ≤ v < 2.73.12.12.73.0
Affected range stops below 2.73.12.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

1.7LOWbcorg
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-787

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