1.7

CVE-2026-15997: legion of the bouncy castle inc. bc-lts Out-of-bounds Write

CVSS: 1.7v4.0LowDeferred
AliasesUBUNTU-CVE-2026-15997
Published 16-07-2026Last modified 17-07-2026
Open JSON

Vulnerability summary

CVE-2026-15997 is a low (CVSS 1.7) Out-of-bounds Write vulnerability in legion of the bouncy castle inc. bc-lts. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.7% of scored vulnerabilities.

Overall risk
7/100
0100
Minimal · default modelHow is this calculated?
CVSS score
1.7/10
010
Low · v4.0 (CVE.org)
EPSS score
0.14%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 16-07-2026
    PublishedVulnerability first disclosed.
  2. 17-07-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

0.00 pp

From 0.14% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.14%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Legion of the bouncy castle inc.1 product
Ubuntu1 product
  • bouncycastleAll versions (No fix recorded)

2 vendors · 2 products

References

3 links