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Vulnerabilities

Vulnerability · CVE-2026-33416

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files.

Published Mar 26, 2026 · catalog updated Jun 17, 2026 · LIBPNG is a reference

Check if you run it

No confirmed exploitation is on record for CVE-2026-33416. EPSS is 1.05%. Act only if a listed version of LIBPNG is a reference is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (LIBPNG is a reference).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.05%
Remediation
Advisory link
Affected products
cpe libpng/libpng

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, and each alias a heap-allocated buffer between and , sharing a single allocation across two structs with independent lifetimes. The aliasing has been present since at least libpng 1.0, and the aliasing since at least 1.2.1. Both affect all prior release lines sets (256-byte buffer) and sets (768-byte buffer). In both cases, calling (with or ) frees the buffer through while the corresponding pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to or has the same effect, because both functions call internally before reallocating the buffer. Version 1.6.56 fixes the issue.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe libpng/libpngversion unspecified

How to fix CVE-2026-33416

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-33416. EPSS is 1.05%. Act only if a listed version of LIBPNG is a reference is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free. EPSS 1.05%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 26, 2026 · NIST NVD

    Detected

    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, and each alias a heap-allocated buffer between and , sharing a single allocation across two structs with independent lifetimes. The aliasing has been present since at least libpng 1.0, and the aliasing since at least 1.2.1. Bo

  2. Jun 17, 2026 · NIST NVD

    Updated

    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, and each alias a heap-allocated buffer between and , sharing a single allocation across two structs with independent lifetimes. The aliasing has been present since at least libpng 1.0, and the aliasing since at least 1.2.1. Bo

Sources

  • CVE.orgVulnerability recordCVE-2026-33416

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33416

    30-day exploitation probability 1.1%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33416

    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, and each alias a heap-allocated buffer between and ,

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.