---
title: "CVE-2026-73639: Imager::File::PNG - Buffer Overflow"
description: "Imager::File::PNG < 1.004 for Perl contains a buffer overflow caused by incorrect row buffer sizing when reading PNGs with tRNS transparency chunk in read_direct8, letting attackers cause heap corruption and crash the process, exploit requires crafted PNG input."
url: https://panop.io/threat-heartbeat/CVE-2026-73639/
---

# CVE-2026-73639 Imager::File::PNG - Buffer Overflow

Imager::File::PNG < 1.004 for Perl contains a buffer overflow caused by incorrect row buffer sizing when reading PNGs with tRNS transparency chunk in read\_direct8, letting attackers cause heap corruption and crash the process, exploit requires crafted PNG input.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.70% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-73639)

## Details

Type

Buffer Overflow

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Published

17 September 2026

Updated

15 October 2026

Weakness

[CWE-787](https://cwe.mitre.org/data/definitions/787.html)

## Vendor fix

Update to version 1.004 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-73639](https://nvd.nist.gov/vuln/detail/CVE-2026-73639)
- [https://github.com/tonycoz/imager/pull/567](https://github.com/tonycoz/imager/pull/567)
- [https://github.com/tonycoz/imager/security/advisories/GHSA-jhx5-34j8-9g88](https://github.com/tonycoz/imager/security/advisories/GHSA-jhx5-34j8-9g88)
- [https://metacpan.org/release/TONYC/Imager-1.035/changes](https://metacpan.org/release/TONYC/Imager-1.035/changes)
- [https://metacpan.org/release/TONYC/Imager-File-PNG-1.004/changes](https://metacpan.org/release/TONYC/Imager-File-PNG-1.004/changes)
- [http://www.openwall.com/lists/oss-security/2026/09/17/6](http://www.openwall.com/lists/oss-security/2026/09/17/6)
- [https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b.patch](https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b.patch)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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