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DEBIAN-CVE-2026-32853

Type: advisorySource: OSV1 source record

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-32853

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-2026-32853

libvncserver

Source reference: /affected/0/package/name

Affected versions
0.9.14+dfsg-1

Source reference: /affected/0/versions

Fixed versions
0.9.14+dfsg-1+deb12u1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

libvncserver

Source reference: /affected/1/package/name

Affected versions
0.9.15+dfsg-1

Source reference: /affected/1/versions

Fixed versions
0.9.15+dfsg-1+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

libvncserver

Source reference: /affected/2/package/name

Affected versions
0.9.15+dfsg-1

Source reference: /affected/2/versions

0.9.15+dfsg-2

Source reference: /affected/2/versions

Fixed versions
0.9.15+dfsg-3

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": "0.9.14+dfsg-1+deb12u1"
          }
        ]
      }
    ],
    "package": {
      "name": "libvncserver",
      "purl": "pkg:deb/debian/libvncserver?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "0.9.14+dfsg-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-32853.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.9.15+dfsg-1+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "libvncserver",
      "purl": "pkg:deb/debian/libvncserver?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "0.9.15+dfsg-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-32853.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.9.15+dfsg-3"
          }
        ]
      }
    ],
    "package": {
      "name": "libvncserver",
      "purl": "pkg:deb/debian/libvncserver?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "0.9.15+dfsg-1",
      "0.9.15+dfsg-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-32853.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56836 · Revision 1
Added to Heist Feed
Publisher date
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