How severe is CVE-2015-8789?

CVE-2015-8789 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2015-8789 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-8789?

CVE-2015-8789 affects Matroska Libebml. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-8789?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2015-8789 published?

CVE-2015-8789 was published on 2016-01-29 and last updated on 2026-06-17.

CVE-2015-8789

CVE-2015-8789 is a critical-severity vulnerability in Matroska Libebml with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v2: 9.3
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Matroska Libebml
Published: 2016-01-29
Last modified: 2026-06-17

Description

Use-after-free vulnerability in the EbmlMaster::Read function in libEBML before 1.3.3 allows context-dependent attackers to have unspecified impact via a "deeply nested element with infinite size" followed by another element of an upper level in an EBML document.

Frequently asked questions

What is CVE-2015-8789?: Use-after-free vulnerability in the EbmlMaster::Read function in libEBML before 1.3.3 allows context-dependent attackers to have unspecified impact via a "deeply nested element with infinite size" followed by another element of an upper level in an EBML document.
How severe is CVE-2015-8789?: CVE-2015-8789 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-8789 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-8789?: CVE-2015-8789 affects Matroska Libebml. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-8789?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2015-8789 published?: CVE-2015-8789 was published on 2016-01-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:matroska:libebml:*:*:*:*:*:*:*:*

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