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HIGH

CVE-2026-87877

CVSS v3

7.7

HIGH

EPSS Score

0.2 %

exploit probability, as of 2026-09-28

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

zstd-jni versions before 1.5.7-14 fail to validate closed state in setDict, setLongMax, setLevel and setRefMultipleDDicts methods of stream classes. Attackers can call these methods on closed streams to write through freed native pointers, corrupting unrelated objects or crashing the JVM.

Technical details

Published
2026-09-09
Last Modified
2026-09-09

Frequently asked questions

What is CVE-2026-87877?

zstd-jni versions before 1.5.7-14 fail to validate closed state in setDict, setLongMax, setLevel and setRefMultipleDDicts methods of stream classes. Attackers can call these methods on closed streams to write through freed native pointers, corrupting unrelated objects or crashing the JVM.

Is CVE-2026-87877 actively exploited?

Active exploitation of CVE-2026-87877 has not been confirmed. Its EPSS score was 0.2% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-87877?

CVE-2026-87877 has a CVSS v3 base score of 7.7 (HIGH severity).

Is CVE-2026-87877 affecting your environment?

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