Quick answers
- Is CVE-2026-124579 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124579 being exploited in the wild.
- How severe is CVE-2026-124579?
- High severity, with a CVSS score of 7.4, published 9 November 2026.
- Which products and versions are affected?
- aaPanel BillionMail up to 4.9.
- Is there a fix for CVE-2026-124579?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-124579 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-124579?
- Check whether you run aaPanel BillionMail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The Relay Configuration API in core/api/relay/v1/relay.go fails to properly sanitize the helo_name parameter, allowing injection of newlines that can arbitrary service definitions into the Postfix master.cf configuration file. An authenticated attacker can chain this with automatic Postfix reload operations to achieve remote code execution as the "nobody" user. The vulnerability requires valid authentication and a relay with configured sender domains to trigger payload execution.
Affected products
- aaPanel BillionMail up to 4.9
Timeline
- 2026-11-09: disclosed
- other: Vendor contacted early but did not respond