Quick answers
- Is CVE-2026-78002 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-78002 being exploited in the wild.
- How severe is CVE-2026-78002?
- High severity, with a CVSS score of 7.5, published 27 August 2026.
- Which products and versions are affected?
- rsyslog rsyslog.
- Is there a fix for CVE-2026-78002?
- 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-2026-78002 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-78002?
- Check whether you run Rsyslog. 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 vulnerability is a heap buffer overflow in the RainerScript `replace()` function, triggered by incorrect buffer size calculation during string replacement operations. An unauthenticated remote attacker can exploit this by sending specially crafted syslog messages over the network to a system running vulnerable rsyslog. The flaw leads to memory corruption that crashes the rsyslog daemon, resulting in denial of service. The attack vector is network-based with no authentication requirement, though no active exploitation in the wild has been reported. Patches addressing the buffer size calculation are expected from the rsyslog project.
Affected products
- rsyslog rsyslog
Timeline
- 2026-08-27: disclosed