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  4. CVE 2026 78660 http2 transport accepts malformed framing related
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-78660

HTTP/2 transport accepts malformed framing-related headers in net/httpCVE-2026-78660

Answer in brief

CVE-2026-78660 records a Unknown severity vulnerability in HTTP/2 transport accepts malformed framing-related headers in net/http. The current sources do not mark it as known exploited. The current feed maps golang.org/x/net/golang.org/x/net/http2 (generic), Go standard library/net/http (generic), Go standard library/net/http/internal/http2 (generic), golang.org/x/net (go) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 8, 2026Updated Oct 8, 2026Source checked Oct 9, 2026First seen by HOL Oct 8, 2026Material review Oct 8, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
6 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps golang.org/x/net/golang.org/x/net/http2 (generic), Go standard library/net/http (generic), Go standard library/net/http/internal/http2 (generic), golang.org/x/net (go) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
golang.org/x/net/golang.org/x/net/http2generic>=0 <0.60.00.60.0
Go standard library/net/httpgeneric>=0 <1.26.91.26.9
Go standard library/net/http/internal/http2generic>=1.27.0-0 <1.27.21.27.2
golang.org/x/netgo>=0 <0.60.00.60.0
stdlibgo>=0 <1.26.91.26.9
stdlibgo>=1.27.0-0 <1.27.21.27.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for golang.org/x/net/golang.org/x/net/http2, Go standard library/net/http, Go standard library/net/http/internal/http2.
  2. 2Review the reported fix. Update golang.org/x/net/golang.org/x/net/http2 to 0.60.0; Go standard library/net/http to 1.26.9; Go standard library/net/http/internal/http2 to 1.27.2; golang.org/x/net to 0.60.0; stdlib to 1.26.9; stdlib to 1.27.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 8, 2026

Sources and claim methodology

  • Source referencego.dev
  • Source referencego.dev
  • Source referencego.dev
  • Source referencegroups.google.com
  • Source referencepkg.go.dev
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Root.Mkdir(All) can follow junctions out of the root on Windows in osSame stdlib package
  • HTTP/1 client connection desynchronization after CONNECT rejection in net/httpSame go standard library/net/http package
  • HTTP/2 server memory exhaustion due to Trailer headers in net/httpSame golang.org/x/net/golang.org/x/net/http2 package
  • Double flow control refund on HTTP/2 server streams in net/httpSame golang.org/x/net/golang.org/x/net/http2 package
  • Lack of limit on size of parsed Range headers in net/httpSame go standard library/net/http package
  • Excessive CPU consumption from repeated initial window changes in net/httpSame golang.org/x/net/golang.org/x/net/http2 package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-444
Source
CVE List V5
Source checked
Oct 9, 2026
References
5 linked sources
Open source record