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VulnerabilityCVE-2026-15997Published 2026-07-16

CVE-2026-15997 — Legion of the Bouncy Castle Inc. BC-LTS

low (derived)

As of 2026-07-17, CVE-2026-15997 is a Low-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in Legion of the Bouncy Castle Inc. BC-LTS, CVSS v4.0 1.7, EPSS 0.1% (1.0th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-15997 as of 2026-07-17; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v4.0
1.7/10Low (derived)
EPSS
0.1%Higher than 1.0% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
0.9/10Threadlinqs triage score
Published
Updated 2026-07-17
CVSS v4.0 1.7 (Low, derived from score) · EPSS 0.1% (higher than 1.0% of all scored CVEs) · Priority 0.9/10 · Published 2026-07-16

Last updated:

What is CVE-2026-15997?

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.

The record classifies CVE-2026-15997 under weakness class CWE-787. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 81 days ago.

Severity and exploitation probability

CVSS v4.0 base score
1.7 — Low (derived from score)
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
EPSS (FIRST)
0.1% probability of exploitation in the next 30 days, higher than 1.0% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
0.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-07-16, last modified 2026-07-17

Is CVE-2026-15997 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

Affected products and versions

  • Legion of the Bouncy Castle Inc.: BC-LTS

How to fix CVE-2026-15997

No vendor patch reference has been recorded for CVE-2026-15997 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-15997

No threat campaign in the Threadlinqs corpus currently references CVE-2026-15997, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references