CVE-2026-78660

CVE Enrichment

CVSS: 7.5 HIGH
EPSS: 0.30%
EPSS Percentile: 21.34%
CISA KEV: Not listed

Description

Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing. However, this makes it possible for our HTTP/2 implementation to forward responses containing such headers to an HTTP/1 client when acting as a reverse proxy. If the HTTP/1 client also does not behave strictly enough, this can result in response smuggling.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: security@golang.org
Published: 09-Oct-2026 06:17
Last Modified: 10-Oct-2026 00:16
EPSS Date: 2026-10-13
CWE: CWE-444

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:N /
                            I:H /
                            A:N

References

Last enrichment sync: 14-Oct-2026 21:00
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

CVE-2026-78660 Microsoft October 2026 Updates Fix 1,411 Flaws, Including Three Zero-Days

CVE (1235)

People (2)

MITRE ATT&CK (1)

Vendors (14)

Products (87)

Tools (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.