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Vulnerability Details :

CVE-2026-40930

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-04 Jun, 2026 | 14:34
Updated At-04 Jun, 2026 | 15:05
Rejected At-
Credits

LIBPNG: Chunk smuggling in push-mode APNG parser via unconsumed chunk body

LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files. In version 1.8.0, three inter-frame chunk discard paths in the push-mode APNG parser clear the chunk-header flag without consuming the chunk body and CRC, allowing attacker-controlled bytes inside an ignored ancillary chunk to be reinterpreted as a fresh chunk header on the next call to `png_process_data`. Commit faf06924688b62d7c1654b5ceddedbde66ffadb4 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:04 Jun, 2026 | 14:34
Updated At:04 Jun, 2026 | 15:05
Rejected At:
▼CVE Numbering Authority (CNA)
LIBPNG: Chunk smuggling in push-mode APNG parser via unconsumed chunk body

LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files. In version 1.8.0, three inter-frame chunk discard paths in the push-mode APNG parser clear the chunk-header flag without consuming the chunk body and CRC, allowing attacker-controlled bytes inside an ignored ancillary chunk to be reinterpreted as a fresh chunk header on the next call to `png_process_data`. Commit faf06924688b62d7c1654b5ceddedbde66ffadb4 fixes the issue.

Affected Products
Vendor
pnggroup
Product
libpng
Versions
Affected
  • = 1.8.0
Vendor
pnggroup
Product
libpng-apng
Versions
Affected
  • >= 1.6.49, <= 1.6.57
Problem Types
TypeCWE IDDescription
CWECWE-436CWE-436: Interpretation Conflict
Type: CWE
CWE ID: CWE-436
Description: CWE-436: Interpretation Conflict
Metrics
VersionBase scoreBase severityVector
3.15.4MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Version: 3.1
Base score: 5.4
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x
x_refsource_CONFIRM
https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4
x_refsource_MISC
Hyperlink: https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
http://www.openwall.com/lists/oss-security/2026/05/15/21
N/A
Hyperlink: http://www.openwall.com/lists/oss-security/2026/05/15/21
Resource: N/A
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:04 Jun, 2026 | 16:16
Updated At:04 Jun, 2026 | 16:23

LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files. In version 1.8.0, three inter-frame chunk discard paths in the push-mode APNG parser clear the chunk-header flag without consuming the chunk body and CRC, allowing attacker-controlled bytes inside an ignored ancillary chunk to be reinterpreted as a fresh chunk header on the next call to `png_process_data`. Commit faf06924688b62d7c1654b5ceddedbde66ffadb4 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
Secondary3.15.4MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Type: Secondary
Version: 3.1
Base score: 5.4
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-436Primarysecurity-advisories@github.com
CWE ID: CWE-436
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4security-advisories@github.com
N/A
https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2xsecurity-advisories@github.com
N/A
http://www.openwall.com/lists/oss-security/2026/05/15/21af854a3a-2127-422b-91ae-364da2661108
N/A
Hyperlink: https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x
Source: security-advisories@github.com
Resource: N/A
Hyperlink: http://www.openwall.com/lists/oss-security/2026/05/15/21
Source: af854a3a-2127-422b-91ae-364da2661108
Resource: N/A

Change History

0
Information is not available yet

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