CVE-2025-58050Public exploitNetwork attack vector

Memory disclosure via stale substring boundary

Published Aug 27, 2025 · Updated Aug 27, 2025

A heap-buffer-overflow read in PCRE2 10.45's matching engine allows remote attackers to disclose memory via a crafted regex pattern. An immediate (*ACCEPT) inside (*scs:...) leaves end_subject shortened, so unsigned bounds arithmetic lets match_ref pass and memcmp read beyond the heap allocation. Exploitation requires control of the regular expression pattern; crafted subject text alone cannot trigger the flaw, and consequences are bounded to information disclosure or a process crash.

CVSS severity6.9
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A heap-buffer-overflow read in PCRE2 10.45's matching engine allows remote attackers to disclose memory via a crafted regex pattern. An immediate (*ACCEPT) inside (*scs:...) leaves end_subject shortened, so unsigned bounds arithmetic lets match_ref pass and memcmp read beyond the heap allocation. Exploitation requires control of the regular expression pattern; crafted subject text alone cannot trigger the flaw, and consequences are bounded to information disclosure or a process crash.

The record

CVE
CVE-2025-58050
Published
Aug 27, 2025
Updated
Aug 27, 2025
Vendor
PCRE2 Project
Product
PCRE2
Classifications
CWE-122, CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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== 10.45

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PCRE2 Project · PCRE2version== 10.45

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
6.9GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:L/SI:N/SA:L

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 exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-125Out-of-bounds Read

Public exploit references

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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