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Vulnerability Details :

CVE-2026-33416

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-26 Mar, 2026 | 16:48
Updated At-01 Apr, 2026 | 03:55
Rejected At-
Credits

LIBPNG has use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE`

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng 1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS` sets `png_ptr->trans_alpha = info_ptr->trans_alpha` (256-byte buffer) and `png_set_PLTE` sets `info_ptr->palette = png_ptr->palette` (768-byte buffer). In both cases, calling `png_free_data` (with `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr` pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes the issue.

Vendors
-
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:26 Mar, 2026 | 16:48
Updated At:01 Apr, 2026 | 03:55
Rejected At:
▼CVE Numbering Authority (CNA)
LIBPNG has use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE`

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng 1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS` sets `png_ptr->trans_alpha = info_ptr->trans_alpha` (256-byte buffer) and `png_set_PLTE` sets `info_ptr->palette = png_ptr->palette` (768-byte buffer). In both cases, calling `png_free_data` (with `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr` pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes the issue.

Affected Products
Vendor
pnggroup
Product
libpng
Versions
Affected
  • >= 1.2.1, < 1.6.56
Problem Types
TypeCWE IDDescription
CWECWE-416CWE-416: Use After Free
Type: CWE
CWE ID: CWE-416
Description: CWE-416: Use After Free
Metrics
VersionBase scoreBase severityVector
3.17.5HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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-m4pc-p4q3-4c7j
x_refsource_CONFIRM
https://github.com/pnggroup/libpng/pull/824
x_refsource_MISC
https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb
x_refsource_MISC
https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667
x_refsource_MISC
https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25
x_refsource_MISC
https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1
x_refsource_MISC
Hyperlink: https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7j
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/pnggroup/libpng/pull/824
Resource:
x_refsource_MISC
Hyperlink: https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb
Resource:
x_refsource_MISC
Hyperlink: https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667
Resource:
x_refsource_MISC
Hyperlink: https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25
Resource:
x_refsource_MISC
Hyperlink: https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
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
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:26 Mar, 2026 | 17:16
Updated At:02 Apr, 2026 | 20:28

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng 1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS` sets `png_ptr->trans_alpha = info_ptr->trans_alpha` (256-byte buffer) and `png_set_PLTE` sets `info_ptr->palette = png_ptr->palette` (768-byte buffer). In both cases, calling `png_free_data` (with `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr` pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 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
Secondary3.17.5HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Type: Secondary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CPE Matches
libpng
libpng
>>libpng>>Versions from 1.2.1(inclusive) to 1.6.56(exclusive)
cpe:2.3:a:libpng:libpng:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-416Primarysecurity-advisories@github.com
CWE ID: CWE-416
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820ebsecurity-advisories@github.com
Patch
https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667security-advisories@github.com
Patch
https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25security-advisories@github.com
Patch
https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1security-advisories@github.com
Patch
https://github.com/pnggroup/libpng/pull/824security-advisories@github.com
Issue Tracking
Exploit
https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7jsecurity-advisories@github.com
Patch
Vendor Advisory
Hyperlink: https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/pnggroup/libpng/pull/824
Source: security-advisories@github.com
Resource:
Issue Tracking
Exploit
Hyperlink: https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7j
Source: security-advisories@github.com
Resource:
Patch
Vendor Advisory

Change History

0
Information is not available yet

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