CVE-2018-6548

CRITICAL 9.8CVE-2018-6548 · Published 02/02/2018 · updated 17/06/2026

In short

CVE-2018-6548 is a CRITICAL (CVSS 9.8) vulnerability affecting libwebm (webmproject).
Chance of exploitation in the next 30 days (EPSS): 1.4%, higher than 72.3% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
libwebm webmproject	`≤ 1.0.0.27`	No fix yet

Description

A use-after-free issue was discovered in libwebm through 2018-02-02. If a Vp9HeaderParser was initialized once before, its property frame_ would not be changed because of code in vp9parser::Vp9HeaderParser::SetFrame. Its frame_ could be freed while the corresponding pointer would not be updated, leading to a dangling pointer. This is related to the function OutputCluster in webm_info.cc.

References

bugs.chromium.org/p/webm/issues/detail · Permissions Required
dwfault/PoCs · Exploit

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