CVE-2022-31627Network attack vector

Information disclosure or DoS via invalid free

Published Jul 28, 2022 · Updated Sep 16, 2024

A memory corruption flaw in PHP 8.1.0 through 8.1.7 allows remote attackers to disclose information or interrupt service via finfo_buffer. The fileinfo finfo_buffer path frees libmagic-allocated memory with an incompatible allocator operation, corrupting the heap. Exploitation requires a reachable application that invokes fileinfo on attacker-influenced data; outcomes are information disclosure or process failure, not guaranteed code execution.

CVSS severity9.8
Critical
EPSS probability2.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory corruption flaw in PHP 8.1.0 through 8.1.7 allows remote attackers to disclose information or interrupt service via finfo_buffer. The fileinfo finfo_buffer path frees libmagic-allocated memory with an incompatible allocator operation, corrupting the heap. Exploitation requires a reachable application that invokes fileinfo on attacker-influenced data; outcomes are information disclosure or process failure, not guaranteed code execution.

The record

CVE
CVE-2022-31627
Published
Jul 28, 2022
Updated
Sep 16, 2024
Vendor
The PHP Group
Product
PHP
Classifications
CWE-787, CWE-590, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.1.X <8.1.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The PHP Group · PHPversion=8.1.X <8.1.8

Published CVSS scores

7.7PHP GroupCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-590Free of Memory not on the Heap
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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