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Vulnerability Details :

CVE-2026-28231

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-27 Feb, 2026 | 20:13
Updated At-27 Feb, 2026 | 20:13
Rejected At-
Credits

pillow_heif Has Integer Overflow in Encode Path Buffer Validation that Leads to Heap Out-of-Bounds Read

pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of `_pillow_heif.c` allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (process crash). No special configuration is required — this triggers under default settings. Version 1.3.0 fixes the issue.

Vendors
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Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:27 Feb, 2026 | 20:13
Updated At:27 Feb, 2026 | 20:13
Rejected At:
▼CVE Numbering Authority (CNA)
pillow_heif Has Integer Overflow in Encode Path Buffer Validation that Leads to Heap Out-of-Bounds Read

pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of `_pillow_heif.c` allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (process crash). No special configuration is required — this triggers under default settings. Version 1.3.0 fixes the issue.

Affected Products
Vendor
bigcat88
Product
pillow_heif
Versions
Affected
  • < 1.3.0
Problem Types
TypeCWE IDDescription
CWECWE-125CWE-125: Out-of-bounds Read
CWECWE-190CWE-190: Integer Overflow or Wraparound
Type: CWE
CWE ID: CWE-125
Description: CWE-125: Out-of-bounds Read
Type: CWE
CWE ID: CWE-190
Description: CWE-190: Integer Overflow or Wraparound
Metrics
VersionBase scoreBase severityVector
4.05.5MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Version: 4.0
Base score: 5.5
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/bigcat88/pillow_heif/security/advisories/GHSA-5gjj-6r7v-ph3x
x_refsource_CONFIRM
https://github.com/bigcat88/pillow_heif/commit/8305a15d3780c533b762578cbe987d27a2c59c7a
x_refsource_MISC
https://github.com/bigcat88/pillow_heif/releases/tag/v1.3.0
x_refsource_MISC
Hyperlink: https://github.com/bigcat88/pillow_heif/security/advisories/GHSA-5gjj-6r7v-ph3x
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/bigcat88/pillow_heif/commit/8305a15d3780c533b762578cbe987d27a2c59c7a
Resource:
x_refsource_MISC
Hyperlink: https://github.com/bigcat88/pillow_heif/releases/tag/v1.3.0
Resource:
x_refsource_MISC
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:27 Feb, 2026 | 20:21
Updated At:27 Feb, 2026 | 20:21

pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of `_pillow_heif.c` allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (process crash). No special configuration is required — this triggers under default settings. Version 1.3.0 fixes the issue.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.05.5MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 5.5
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-125Primarysecurity-advisories@github.com
CWE-190Primarysecurity-advisories@github.com
CWE ID: CWE-125
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-190
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/bigcat88/pillow_heif/commit/8305a15d3780c533b762578cbe987d27a2c59c7asecurity-advisories@github.com
N/A
https://github.com/bigcat88/pillow_heif/releases/tag/v1.3.0security-advisories@github.com
N/A
https://github.com/bigcat88/pillow_heif/security/advisories/GHSA-5gjj-6r7v-ph3xsecurity-advisories@github.com
N/A
Hyperlink: https://github.com/bigcat88/pillow_heif/commit/8305a15d3780c533b762578cbe987d27a2c59c7a
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/bigcat88/pillow_heif/releases/tag/v1.3.0
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/bigcat88/pillow_heif/security/advisories/GHSA-5gjj-6r7v-ph3x
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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