# CVE-2026-10758: Esri LERC heap overflow via integer overflow in image encoding

Source: https://junglewise.ai/threats/cve-2026-10758-esri-lerc-is-an-open-source-image-or-raster-format-which-supports  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-25. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-10758 · Severity: high · CVSS 7.5 · Published 2026-09-25

Esri LERC is an open-source library for rapidly encoding and decoding raster image data. A heap-based buffer overflow triggered by specially crafted image files could allow remote attackers to crash applications that use LERC, causing service disruptions or potential data loss during processing.

Vendors: [Esri](https://junglewise.ai/threats/vendors/esri).

## Quick answers

**Is CVE-2026-10758 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-10758 being exploited in the wild.

**How severe is CVE-2026-10758?** High severity, with a CVSS score of 7.5, published 25 September 2026.

**Which products and versions are affected?** Esri LERC 4.1.0 and earlier.

**Is there a fix for CVE-2026-10758?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-10758 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-10758?** Check whether you run Esri LERC at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An integer overflow vulnerability in LERC's image decoding logic leads to a heap-based buffer write, allowing remote unauthenticated attackers to trigger the flaw by submitting specially crafted raster imagery. Exploitation requires only that an application processes untrusted LERC-formatted files; no user interaction or privileges are needed. Successful exploitation results in application crash and denial of service.

## Affected products

- Esri LERC 4.1.0 and earlier

## Timeline

- 2026-09-25: disclosed

## References

- [https://github.com/Esri/lerc/security/advisories/GHSA-cw29-mw7w-pj37](https://github.com/Esri/lerc/security/advisories/GHSA-cw29-mw7w-pj37)