CVE-2026-72854Proof of concept (PoC) published · CISA

msgpack-c Integer Overflow in msgpack_unpacker_expand_buffer Causes a False-Success Undersized Reservation

CVSS score

5.3

EPSS probability

%0.2

Risk score

0.0

Published

1 mo ago

Vulnerability Timeline (Change History)

CVE-2026-72854 historical changes made to the vulnerability by NVD, CISA and MITRE:

Date	Actor / Source	Action / Description	Type	Previous value	New value
18.10.2026	nvd@nist.gov	Initial Analysis & CVSS Vector Assignment	CVSS V3.1	—	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L
20.08.2026	CISA Coordinator	SSVC Risk Re-assessment	SSVC / KEV	exploitation: none	exploitation: none
20.08.2026	MITRE / NVD	New CVE Record Received & Ingested	CVE Created	—	CVE-2026-72854

6.9

Patch status unknownEPSS %11 mo ago

7.5

Patch verifiedEPSS %03 mo ago

6.9

Patch status unknownEPSS %01 mo ago

5.4

Patch verified Public Exploits:1EPSS %02 mo ago

Affected products, version ranges, exploitation status and patch information in a single request, with a free key.

curl -H "x-api-key: $DAYBREACH_API_KEY" \
  "https://api.daybreach.dev/api/v1/intel/cves/CVE-2026-72854"