CVE-2025-40930

JSON::SIMD before version 1.07 and earlier for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact

HIGH
7.5
CVSS Score
Published: September 8, 2025 at 03:09 PM UTC
Updated: June 17, 2026 at 09:22 AM UTC
1 product affected across 1 vendorJSON::SIMD

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
PoC

Description

JSON::SIMD before version 1.07 and earlier for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.07
Affected range stops below 1.07, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (4)

Related
Source: 9b29abf9-4ab0-4765-b253-1875cd9b441e
https://metacpan.org/release/PJUHASZ/JSON-SIMD-1.06/source/SIMD.xs#L248
Release Notes
Source: 9b29abf9-4ab0-4765-b253-1875cd9b441e
https://metacpan.org/release/PJUHASZ/JSON-SIMD-1.07/changes
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2025/09/08/3

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-122

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