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DEBIAN-CVE-2026-34757

Type: advisorySource: OSV1 source record

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer, which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata) or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This vulnerability is fixed in 1.6.57.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-34757

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-34757

libpng1.6

Source reference: /affected/0/package/name

Affected versions
1.6.39-2

Source reference: /affected/0/versions

1.6.39-2+deb12u1

Source reference: /affected/0/versions

1.6.39-2+deb12u2

Source reference: /affected/0/versions

1.6.39-2+deb12u3

Source reference: /affected/0/versions

1.6.39-2+deb12u4

Source reference: /affected/0/versions

Fixed versions
1.6.39-2+deb12u5

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

libpng1.6

Source reference: /affected/1/package/name

Affected versions
1.6.48-1

Source reference: /affected/1/versions

1.6.48-1+deb13u1

Source reference: /affected/1/versions

1.6.48-1+deb13u2

Source reference: /affected/1/versions

1.6.48-1+deb13u3

Source reference: /affected/1/versions

1.6.48-1+deb13u4

Source reference: /affected/1/versions

Fixed versions
1.6.48-1+deb13u5

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

libpng1.6

Source reference: /affected/2/package/name

Affected versions
1.6.48-1

Source reference: /affected/2/versions

1.6.49-1~exp1

Source reference: /affected/2/versions

1.6.50-1

Source reference: /affected/2/versions

1.6.50-1~exp1

Source reference: /affected/2/versions

1.6.51-1

Source reference: /affected/2/versions

1.6.52-1

Source reference: /affected/2/versions

1.6.53-1

Source reference: /affected/2/versions

1.6.54-1

Source reference: /affected/2/versions

1.6.55-1

Source reference: /affected/2/versions

1.6.56-1

Source reference: /affected/2/versions

Fixed versions
1.6.57-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.6.39-2+deb12u5"
          }
        ]
      }
    ],
    "package": {
      "name": "libpng1.6",
      "purl": "pkg:deb/debian/libpng1.6?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1.6.39-2",
      "1.6.39-2+deb12u1",
      "1.6.39-2+deb12u2",
      "1.6.39-2+deb12u3",
      "1.6.39-2+deb12u4"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34757.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.6.48-1+deb13u5"
          }
        ]
      }
    ],
    "package": {
      "name": "libpng1.6",
      "purl": "pkg:deb/debian/libpng1.6?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.6.48-1",
      "1.6.48-1+deb13u1",
      "1.6.48-1+deb13u2",
      "1.6.48-1+deb13u3",
      "1.6.48-1+deb13u4"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34757.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.6.57-1"
          }
        ]
      }
    ],
    "package": {
      "name": "libpng1.6",
      "purl": "pkg:deb/debian/libpng1.6?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.6.48-1",
      "1.6.49-1~exp1",
      "1.6.50-1",
      "1.6.50-1~exp1",
      "1.6.51-1",
      "1.6.52-1",
      "1.6.53-1",
      "1.6.54-1",
      "1.6.55-1",
      "1.6.56-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34757.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56823 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-34757 · Revision 1Source updated