External risk intelligence

Imager TGA Parsing Out-of-Bounds Read Leads to Process Exit.

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-93019

Imager is a Perl library for image processing. It is not an internet-facing appliance or service by default. While it can be used in web applications to process user-uploaded files, internet reachability is entirely dependent on the specific implementation of the host application, making public exposure a possibility rather than a default characteristic of the library itself.

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory concerns a critical vulnerability in an image processing library that could lead to unexpected application termination when processing specially crafted image files. While the library itself is not typically internet-facing, its use in web applications means there's a potential for external manipulation if it handles user-supplied image data. The primary concern at this stage is to determine if this library is in use and if it processes untrusted image inputs.

Affects image processing library, causing unexpected exits.
Consider if this library handles user-uploaded images.
Confirm use and exposure to untrusted image files.

Attack Path

How an attacker could exploit the issue

An attacker could trigger this vulnerability by providing a specially crafted TGA image file to an application that uses the Imager library to process images. The library's image reading function, when encountering a color map length of 32768 or more in the TGA file, mishandles the value, leading to a program exit.

Attacker provides a malicious TGA file.
Imager reads TGA with large color map length.
Application unexpectedly exits.

Live Threat

Current exploitation, exposure, and threat context

When supported by the advisory, an attacker could trigger an uncatchable process exit by providing a specially crafted TGA image file to the Imager library. This could disrupt the normal operation of applications that rely on Imager for image processing.

Application processes could terminate unexpectedly.
Malicious image files could trigger the exit.
Service availability may be impacted.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in the Imager Perl library impacts systems processing TGA image files. Application owners, in coordination with infrastructure or platform teams, should prioritize identifying all instances of the affected library, assessing exposure through image processing functions, and determining business criticality. A risk-based remediation plan, including vendor coordination for updates or alternative controls, should then be developed.

Identify accountable application owners.
Verify TGA file processing exposure.
Plan remediation based on risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the Imager library and how is it used?

Imager is a Perl library designed for image manipulation and processing tasks. Developers incorporate it into software to perform operations like resizing, editing, or converting image formats. Because it handles various file types, it is commonly found in web applications or backend scripts that allow users to upload, manage, or transform graphical content.

What does CVE-2026-93019 mean for an application?

This vulnerability is classified as CWE-196 (Unsigned to Signed Conversion Error) and CWE-789 (Memory Allocation with Excessive Size). When the library processes a TGA file with a very large color map, it misinterprets the data length, causing a memory allocation error. This triggers an uncatchable process exit, which forces the host application to crash and stop functioning.

How can an attacker trigger this vulnerability?

An attacker must provide a specially crafted TGA image file to an application that uses the vulnerable version of the Imager library. If the image contains a color map length of 32,768 or greater, the crash occurs. Simply having the library installed is not enough; the application must actively use it to parse or read an untrusted TGA file provided by a user.

Do I need to worry about this in my environment?

According to Halo Surface Signal, Imager is not an internet-facing appliance by default. Your risk depends on whether your application uses Imager to process images uploaded by users. If your systems handle untrusted file inputs, the possibility of external exposure increases, making it critical to confirm if your specific application implementation exposes this library to external traffic.

When should I prioritize a response to this issue?

Prioritize your response if your applications perform image processing on files sourced from outside your organization. First, identify all systems running the affected Imager version. Once identified, evaluate if those services process TGA files from untrusted sources. If so, coordinate with your technical teams to plan for updates or implement controls to restrict the types of files processed by the application.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.