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Imager-1.021
⭐ Starred 27 / Imager::Transform
Security Advisories (4)
CVE-2024-53901 (2024-11-17)

"invalid next size" backtrace on use of trim on certain images

CVE-2026-8669 (2026-05-15)

Imager versions through 1.030 for Perl allow a heap out of bounds (OOB) write on crafted multi-frame GIF files. Imager::File::GIF's i_readgif_multi_low allocates a single per-row buffer GifRow sized for the GIF's global screen width 'SWidth' and reuses it across every image in the file. The page-match branch validates Image.Width + Image.Left > SWidth before each DGifGetLine write, but the parallel skip-image branch at imgif.c:790-805 calls DGifGetLine(GifFile, GifRow, Width) with no such check.

CVE-2026-13705 (2026-07-06)

Imager versions before 1.032 for Perl have a heap out-of-bounds read in the bundled Imager::File::SGI reader via a 16-bit RLE literal run in read_rgb_16_rle. read_rgb_16_rle guards each literal run with if (count > data_left), but count is a pixel count while every 16-bit sample consumes two bytes. The copy loop reads inp[0] * 256 + inp[1] and advances two bytes per pixel, so a run with data_left / 2 < count <= data_left passes the guard yet consumes 2 * count bytes and reads past the end of the buffer. The 8-bit path is unaffected because there one pixel is one byte. Reading a crafted SGI image through Imager->read triggers the over-read before the parser rejects the malformed image, which can crash the process.

CVE-2026-14454 (2026-07-08)

Imager versions before 1.033 for Perl treat unsigned EXIF IFD entry counts as signed. Imager mishandled large EXIF IFD entry count values, treating them as negative numbers. This could lead to an attempt to allocate a block nearly the size of the address space, which fails and kills the process. An attacker could craft an image with EXIF data that terminates a worker process.

NAME

Imager::Transform - a library of register machine image transformations

SYNOPSIS

# get a list of transformations
my @funcs = Imager::Transform->list;
# create a transformation object
my $tran = Imager::Transform->new($name);
# describe it
print $tran->describe;
# a list of constant names
my @constants = $tran->constants;
# information about some of the constants
my @info = $tran->constants(@constants);

DESCRIPTION

This module provides a library of transformations that use the Imager transform2() function.

The aim is to provide a place to collect these transformations.

At some point there might be an interface to add new functions, but there's not a whole lot of point to that.

The interface is a little sparse as yet.

METHODS

my @names = Imager::Transform->list

Returns a list of the transformations.

my $desc = Imager::Transform->describe($name);
my $desc = $tran->describe()

Describes a transformation specified either by name (as a class method) or by reference (as an instance method).

The class method returns undef if there is no such transformation.

my $tran = Imager::Transform->new($name)

Create a new transformation object. Returns undef if there is no such transformation.

my @inputs = $tran->inputs;
my $inputs = $tran->inputs;

Returns a list of input image descriptions, or the number of them, depending on content.

The list contains hash references, which current contain only one member, desc, a description of the use of the input image.

$tran->constants

Returns a list of names of constants that can be set for the transformation.

$tran->constants($name, $name, ...)

Returns a hashref for each named constant, which contains the default in key default and a description in key desc.

my $out = $tran->transform(\%opts, \%constants, @imgs)

Perform the image transformation.

Returns the new image on success, or undef on failure, in which case you can use $tran->errstr to get an error message.

$tran->errstr

The error message, if any from the last image transformation.

BUGS

Needs more transformations.

SEE ALSO

Imager(3), transform.perl

AUTHOR

Tony Cook <tonyc@cpan.org>