CVE-2026-19082
Received Received - Intake

Heap Over-read in Imager via Zero-Length EXIF Tags

Publication date: 2026-08-07

Last updated on: 2026-08-07

Assigner: CPANSec

Description
Imager versions from 0.45_02 before 1.034 for Perl may expose adjacent heap bytes via strlen() over-read from zero-count ASCII EXIF entries in copy_string_tags. copy_string_tags() computes an ASCII EXIF tag's length as `entry->size - 1` to strip the trailing NUL. A zero-count ASCII entry sets `entry->size` to 0, and the derived length reaches i_tags_add() as -1, which is interpreted as a request to call strlen(), scanning past the entry to the next NUL and copying those bytes into the tag. JPEG reaches this path via im_decode_exif(), as does the separate Imager::File::WEBP distribution, which is fixed by upgrading Imager. Any caller of Imager->read() on an attacker-supplied image with such an entry may receive an exif_* tag holding adjacent heap bytes instead of an empty string.

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Meta Information

Published
2026-08-07
Last Modified
2026-08-07
Generated
2026-08-07
AI Q&A
2026-08-07
EPSS Evaluated
N/A
NVD
CVE-2026-19082
EUVD
EUVD-2026-54561

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
tonycoz imager to 1.033 (inc)
tonycoz imager to 1.034 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

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Executive Summary

This vulnerability affects the Perl Imager library versions from 0.45_02 before 1.034. It involves a flaw in handling zero-count ASCII EXIF entries where a miscalculation leads to a strlen() over-read, exposing adjacent heap bytes. The issue occurs in the copy_string_tags() function when processing malformed EXIF data in images.

Detection Guidance

This vulnerability is triggered by malformed EXIF data in JPEG images processed by Imager versions before 1.034. To detect it, inspect JPEG files for EXIF segments with zero-count ASCII tags. Use tools like exiftool to analyze EXIF data in images on your system. Commands: exiftool -a -u -g1 image.jpg or file -i image.jpg to check for malformed EXIF segments.

Impact Analysis

An attacker could exploit this by providing a crafted JPEG or WEBP image with a malformed EXIF segment. This may result in disclosure of adjacent process memory or cause program instability when the library reads the image. Users processing untrusted images are at risk.

Compliance Impact

This vulnerability may expose adjacent heap bytes via memory over-read, which could lead to unintended data disclosure. For compliance with GDPR, this could violate principles of data minimization and security. Under HIPAA, it might risk unauthorized access to protected health information if such data is processed by the affected library.

Mitigation Strategies

Upgrade Imager to version 1.034 or later. If using Perl's CPAN Imager package, run cpan Imager or cpanm Imager to update. For applications using Imager::File::WEBP, ensure the same upgrade is applied. Remove or quarantine any suspicious JPEG files with malformed EXIF data until patched.

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