CVE-2026-73639
Published: September 17th, 2026
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.
CRITICAL
CVSS v3: 9.1
CVSS v3: 9.1
Status
| DocFilters Release | Package | State | Justification | Comment |
|---|---|---|---|---|
| daily | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 26.3 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 26.2 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 26.1 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 25.4 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 25.3 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 25.2 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 25.1 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 24.4 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 24.4.0 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 24.3 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 24.2 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 24.1 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 23.3 | libpng (1.6.40) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 23.2 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 23.1 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 22.4 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 22.3 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 22.2 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 22.1 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 21.11 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 21.8 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 21.5.0 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 21.2.0 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.19.3667 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.18.3599 | libpng (1.6.37) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.16.3445 | libpng (1.6.28) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.15.3368 | libpng (1.6.28) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.14.3263 | libpng (1.6.28) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.13.3179 | libpng (1.6.28) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.12.3054 | libpng (1.6.28) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.11.3040 | libpng (1.6.28) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.11.2990 | libpng (1.6.28) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.10.2934 | libpng (1.6.28) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.9.2878 | libpng (1.6.28) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. | |
| 11.4.8.2822 | libpng (1.6.28) | False Positive | The flaw is in the Imager Perl module’s PNG reader (read_direct8), not in libpng. Document Filters does not ship or use Imager. |
Severity score breakdown
Attack Complexity
LOW
Attack Vector
NETWORK
Availability Impact
HIGH
Base Score
9.1
Base Severity
CRITICAL
Confidentiality Impact
HIGH
Integrity Impact
NONE
Privileges Required
NONE
Scope
UNCHANGED
User Interaction
NONE
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Version
3.1