PT-2026-28435 · Pypi · Msgpack

Athuljayaram · Published 2026-03-16 · Updated 2026-03-27 · CVE-2026-32284

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions msgpack (affected versions not specified)

Description The msgpack decoder does not correctly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can result in an out-of-bounds read and a runtime panic, potentially leading to a denial of service attack.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-32284

GHSA-H9Q6-HC68-35RP

GO-2026-4513

GO-2026-4740

SUSE-SU-2026:1135-1

Affected Products

Msgpack

References · 151

• 🔥 https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026 · Exploit
• https://github.com/shamaton/msgpack/issues/59 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-32284 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:1135-1 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4513 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4740 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-h9q6-hc68-35rp · Vendor Advisory
• https://github.com/golang/vulndb/issues/4513 · Note
• https://github.com/shamaton/msgpack · Note
• https://suse.com/security/cve/CVE-2026-33679 · Note
• https://suse.com/security/cve/CVE-2026-33320 · Note
• https://suse.com/security/cve/CVE-2026-33529 · Note
• https://suse.com/security/cve/CVE-2026-32750 · Note
• https://suse.com/security/cve/CVE-2026-32828 · Note
• https://suse.com/security/cve/CVE-2026-33623 · Note