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CVE-2015-8789

29
FAUCET Score

CVE-2015-8789 is a critical use-after-free vulnerability in the EbmlMaster::Read function of libEBML versions prior to 1.3.3, affecting products like Matroska and libEBML. This flaw allows context-dependent attackers to achieve significant impact by crafting EBML documents with deeply nested elements followed by an upper-level element. With a CVSS score of 9.6, it presents a high-impact, easily exploitable risk (network-based, low complexity, user interaction required, high confidentiality, integrity, and availability impact). While there is no known active exploitation, public exploit code, or Metasploit/Nuclei modules, the vulnerability has garnered significant community discussion, indicating potential interest.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.3.2CPE matchmatch criteria
cpe:2.3:a:matroska:libebml:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.6CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
6.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.13%
Probability of exploitation in next 30 days
EPSS Percentile
80.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0213 is in the 84th percentile among its peer group of 834 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.8 Bluesky, 0.5 Mastodon, and 1.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Vendor Patches (1)

github_advisoryvendor investigatingvia nvd_reference
View patch

References

lists.matroska.org / pipermail/matroska-users/2015-October/006985.html
Vendor Advisory
lists.opensuse.org / opensuse-updates/2016-01/msg00035.html
github.com / Matroska-Org/libebml/blob/release-1.3.3/ChangeLog
Vendor Advisory
github.com / Matroska-Org/libebml/commit/88409e2a94dd3b40ff81d08bf6d92f486d036b24
debian.org / security/2016/dsa-3538
securityfocus.com / bid/94924
talosintelligence.com / reports/TALOS-2016-0037