# CVE-2026-4775: libtiff signed integer overflow in putcontig8bitYCbCr44tile

Source: https://junglewise.ai/threats/cve-2026-4775-libtiff-signed-integer-overflow-in-putcontig8bitycbcr44tile  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-24. Updated: 2026-05-19  
License: CC BY 4.0 with a link back

CVE-2026-4775 · Severity: high · CVSS 7.8 · Published 2026-03-24

A vulnerability has been identified in libtiff, a widely used library for processing TIFF image files. An attacker could exploit this flaw by tricking a user into opening a specially crafted image file, potentially leading to a complete system takeover or a service crash. This impact is significant for any application or server that automatically processes user-uploaded images.

Technologies: [Debian Linux](https://junglewise.ai/threats/technologies/debian). Vendors: [Debian](https://junglewise.ai/threats/vendors/debian).

## Quick answers

**Is CVE-2026-4775 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-4775 being exploited in the wild.

**How severe is CVE-2026-4775?** High severity, with a CVSS score of 7.8, published 24 March 2026.

**Which products and versions are affected?** Debian Linux 11.0.

**Is there a fix for CVE-2026-4775?** A patch was published on 2026-04-30: Red Hat released security updates for RHEL 9 and 10 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-4775 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-4775?** Check whether you run Debian Linux 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

A signed integer overflow vulnerability exists in the putcontig8bitYCbCr44tile function within libtiff. The flaw is triggered during the processing of specially crafted TIFF files, leading to incorrect memory pointer calculations. This results in an out-of-bounds (OOB) heap write. An attacker can leverage this to achieve arbitrary code execution or cause a denial of service (application crash). The attack requires a user to open a malicious file (User Interaction: Required). Patches have been released by Red Hat and Debian for various enterprise distributions.

## Affected products

- libtiff libtiff 4.4.0, 4.6.0
- Red Hat Enterprise Linux 6.0, 7.0, 8.0, 9.0, 10.0
- Debian Debian Linux 11.0

## Timeline

- 2026-03-24: disclosed: Initial disclosure of CVE-2026-4775
- 2026-03-24: advisory: NVD publication date
- 2026-04-30: patched: Red Hat released security updates for RHEL 9 and 10

## References

- [https://access.redhat.com/errata/RHSA-2026:12265](https://access.redhat.com/errata/RHSA-2026:12265)
- [https://access.redhat.com/errata/RHSA-2026:12271](https://access.redhat.com/errata/RHSA-2026:12271)
- [https://access.redhat.com/errata/RHSA-2026:14929](https://access.redhat.com/errata/RHSA-2026:14929)
- [https://access.redhat.com/errata/RHSA-2026:16055](https://access.redhat.com/errata/RHSA-2026:16055)
- [https://access.redhat.com/errata/RHSA-2026:19150](https://access.redhat.com/errata/RHSA-2026:19150)
- [https://access.redhat.com/security/cve/CVE-2026-4775](https://access.redhat.com/security/cve/CVE-2026-4775)
- [https://bugzilla.redhat.com/show_bug.cgi?id=2450768](https://bugzilla.redhat.com/show_bug.cgi?id=2450768)

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