CVE-2022-1586Network attack vector

Memory disclosure via incorrect JIT property read

Published May 16, 2022 · Updated Mar 6, 2025

Out-of-bounds read in PCRE2 before 10.40 allows context-dependent attackers to disclose process memory or crash a host application. The compile_xclass_matchingpath() path in pcre2_jit_compile.c reads the wrong property-type byte while compiling caseless Unicode property expressions. An embedding application must accept attacker-controlled expressions and enable JIT; consequences are bounded to memory disclosure or service interruption.

CVSS severity9.1
Critical
EPSS probability3.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in PCRE2 before 10.40 allows context-dependent attackers to disclose process memory or crash a host application. The compile_xclass_matchingpath() path in pcre2_jit_compile.c reads the wrong property-type byte while compiling caseless Unicode property expressions. An embedding application must accept attacker-controlled expressions and enable JIT; consequences are bounded to memory disclosure or service interruption.

The record

CVE
CVE-2022-1586
Published
May 16, 2022
Updated
Mar 6, 2025
Vendor
PCRE2 Project
Product
PCRE2
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=Fixed in pcre2-10.40.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PCRE2 Project · PCRE2version=Fixed in pcre2-10.40.

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P

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.

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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-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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