Quick answers
- Is CVE-2026-78660 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-78660 being exploited in the wild.
- How severe is CVE-2026-78660?
- High severity, with a CVSS score of 7.5, published 8 October 2026.
- Which products and versions are affected?
- go (Go) <UNKNOWN>.
- Is there a fix for CVE-2026-78660?
- 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-2026-78660 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-78660?
- Check whether you run go (Go) 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 vulnerability exists in Go's net/http package where the HTTP/2 transport fails to properly validate framing-related headers, allowing malformed headers to pass through without rejection. An attacker on the network can send crafted HTTP/2 frames with invalid headers to exploit this weakness. The impact depends on downstream services' behavior when receiving such malformed input.
Affected products
- Go Go <UNKNOWN>
Identifiers
- CVE-2026-78660
- GO-2026-6610
Timeline
- 2026-10-08: disclosed