CVE-2026-106971 Details
Description
An integer overflow in the MessagePack\BufferUnpacker component of rybakit/msgpack versions prior to 0.11.0 allows attackers to cause a denial of service via crafted MessagePack input when the application runs on 32-bit PHP
A denial-of-service vulnerability has been identified in the MessagePack BufferUnpacker component of rybakit/msgpack version 0.11.0. This issue arises on 32-bit PHP builds, where an integer overflow allows attackers to cause a crash by exhausting process memory with a crafted input. The vulnerability is rooted in how the BufferUnpacker decodes length and size fields using signed shift arithmetic, leading to negative values that can manipulate the decoder into an infinite loop.
Users can upgrade to rybakit/msgpack version 0.11.0 or later, which requires 64-bit PHP and includes fixes to prevent the integer overflow and its associated denial-of-service condition.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 28, 2026CISA-ADP
Assessed Nov 3, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/diptendukar/security-advisories/blob/main/CVE-2026-106971.md | CISA-ADP | AdvisoryExploit |
| https://github.com/diptendukar/security-advisories/blob/main/CVE-2026-106971.md | [email protected] | AdvisoryExploit |
| https://github.com/rybakit/msgpack.php | [email protected] | Vendor |
| https://github.com/rybakit/msgpack.php/releases/tag/v0.11.0 | [email protected] | Release NotesVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-190 | Integer Overflow or Wraparound | CISA-ADP |
| CWE-400 | Uncontrolled Resource Consumption | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| rybakit/msgpack | < 0.11.0 (semver) |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 3, 2026 | CVE Modified | CISA-ADP |
| Oct 29, 2026 | CVE Modified | [email protected] |
| Oct 28, 2026 | New CVE Received | [email protected] |