CVE-2026-54058Public exploitNetwork attack vector

Memory disclosure via undersized mmap row stride

Published Jul 14, 2026 · Updated Jul 14, 2026

Out-of-bounds read in Pillow before 12.3.0 allows remote attackers to disclose process memory via a crafted McIdas AREA image. McIdasImagePlugin derives dimensions, offset, and row stride from header words, while PyImaging_MapBuffer maps rows without requiring the stride to span a full pixel row. Exposure requires an application to open the file by path through the mmap raw codec and access decoded pixels; the read can leak adjacent memory or fault the worker.

CVSS severity8.3
High
EPSS probability0.52%
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 Pillow before 12.3.0 allows remote attackers to disclose process memory via a crafted McIdas AREA image. McIdasImagePlugin derives dimensions, offset, and row stride from header words, while PyImaging_MapBuffer maps rows without requiring the stride to span a full pixel row. Exposure requires an application to open the file by path through the mmap raw codec and access decoded pixels; the read can leak adjacent memory or fault the worker.

The record

CVE
CVE-2026-54058
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Pillow
Product
Pillow
Classifications
CWE-125, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record 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=< 12.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pillow · Pillowversion=< 12.3.0

Published CVSS scores

7.4Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
9.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
8.3GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N

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 exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1190Exploit Public-Facing Application

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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