CVE-2026-73639 Affecting libimager-perl package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ECHOLATEST-LIBIMAGERPERL-19012623
- published20 Aug 2026
- disclosed17 Sept 2026
Introduced: 20 Aug 2026
CVE-2026-73639 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest libimager-perl.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libimager-perl package and not the libimager-perl package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
Imager::File::PNG versions from 1.003 before 1.004 for Perl write past the end of the row buffer reading a PNG with a tRNS transparency chunk in read_direct8.
With a tRNS chunk, read_direct8() adds an alpha channel to the image it creates but still sizes the row buffer from the original channel count. libpng expands the transparency into that extra channel, so png_read_row() fills one channel more than the buffer holds, at one byte per sample, and writes width bytes past the end of the allocation. Palette images go to read_paletted() and 16-bit images to read_direct16(), which sizes its buffer from png_get_rowbytes() and allocates enough for the expanded row.
The same reader ships bundled in the Imager distribution.
Reading an attacker-supplied PNG through Imager->read() corrupts the heap, which can crash the process.
References
- https://advisory.echohq.com/cve/CVE-2026-73639
- https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b.patch
- https://github.com/tonycoz/imager/pull/567
- 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-File-PNG-1.004/changes
- http://www.openwall.com/lists/oss-security/2026/09/17/6