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DFVULN-839 - Use-After-Free in MessagePack::Buffer#clear Enables Cross-Buffer Disclosure

🗓️ 09 Jun 2026 00:00:00Reported by RubySecType 
rubygems
 rubygems
🔗 rubysec.com👁 39 Views

MessagePack::Buffer#clear frees a 4 KiB page, leaves rmem pointers, enabling use-after-free disclosure.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-54522
30 Jul 202616:33
–attackerkb
cbl_mariner
CBLMariner
CVE-2026-54522 affecting package rubygem-msgpack for versions less than 1.8.4-1
11 Sep 202623:52
–cbl_mariner
cgr
Chainguard
CVE-2026-54522 vulnerabilities
5 Aug 202620:23
–cgr
circl
Circl
CVE-2026-54522
30 Jul 202617:31
–circl
cve
CVE
CVE-2026-54522
30 Jul 202616:33
–cve
cvelist
Cvelist
CVE-2026-54522 MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure
30 Jul 202616:33
–cvelist
debiancve
Debian CVE
CVE-2026-54522
30 Jul 202616:33
–debiancve
euvd
EUVD
EUVD-2026-51235
30 Jul 202616:33
–euvd
github
Github Security Blog
MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure
30 Jul 202616:33
–github
mend
Mend
CVE-2026-54522
30 Jul 202616:33
–mend
Rows per page
Vulners
Node
rubymsgpackRange≤1.8.2

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09 Jun 2026 00:00Current
6.5Medium risk
Vulners AI Score6.5
CVSS 3.15.4
CVSS 42.1
EPSS0.00227
SSVC
39