CVE-2026-27141 (GCVE-0-2026-27141)

Vulnerability from cvelistv5 – Published: 2026-02-26 18:50 – Updated: 2026-02-27 19:11
VLAI
Title
Sending certain HTTP/2 frames can cause a server to panic in golang.org/x/net
Summary
Due to missing nil check, sending 0x0a-0x0f HTTP/2 frames will cause a running server to panic
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-27 19:11 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
golang.org/x/net golang.org/x/net/http2 Affected: 0.50.0 , < 0.51.0 (semver)
guessed Create a notification for this product.
Show details on NVD website
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                {
                  "name": "ConnectionError.Error"
                },
                {
                  "name": "ErrCode.String"
                },
                {
                  "name": "FrameHeader.String"
                },
                {
                  "name": "FrameType.String"
                },
                {
                  "name": "FrameWriteRequest.String"
                },
                {
                  "name": "Framer.ReadFrame"
                },
                {
                  "name": "Framer.ReadFrameForHeader"
                },
                {
                  "name": "Framer.ReadFrameHeader"
                },
                {
                  "name": "Framer.WriteContinuation"
                },
                {
                  "name": "Framer.WriteData"
                },
                {
                  "name": "Framer.WriteDataPadded"
                },
                {
                  "name": "Framer.WriteGoAway"
                },
                {
                  "name": "Framer.WriteHeaders"
                },
                {
                  "name": "Framer.WritePing"
                },
                {
                  "name": "Framer.WritePriority"
                },
                {
                  "name": "Framer.WritePriorityUpdate"
                },
                {
                  "name": "Framer.WritePushPromise"
                },
                {
                  "name": "Framer.WriteRSTStream"
                },
                {
                  "name": "Framer.WriteRawFrame"
                },
                {
                  "name": "Framer.WriteSettings"
                },
                {
                  "name": "Framer.WriteSettingsAck"
                },
                {
                  "name": "Framer.WriteWindowUpdate"
                },
                {
                  "name": "GoAwayError.Error"
                },
                {
                  "name": "ReadFrameHeader"
                },
                {
                  "name": "Server.ServeConn"
                },
                {
                  "name": "Setting.String"
                },
                {
                  "name": "SettingID.String"
                },
                {
                  "name": "SettingsFrame.ForeachSetting"
                },
                {
                  "name": "StreamError.Error"
                },
                {
                  "name": "Transport.CloseIdleConnections"
                },
                {
                  "name": "Transport.NewClientConn"
                },
                {
                  "name": "Transport.RoundTrip"
                },
                {
                  "name": "Transport.RoundTripOpt"
                },
                {
                  "name": "bufferedWriter.Flush"
                },
                {
                  "name": "bufferedWriter.Write"
                },
                {
                  "name": "bufferedWriterTimeoutWriter.Write"
                },
                {
                  "name": "chunkWriter.Write"
                },
                {
                  "name": "clientConnPool.GetClientConn"
                },
                {
                  "name": "connError.Error"
                },
                {
                  "name": "dataBuffer.Read"
                },
                {
                  "name": "duplicatePseudoHeaderError.Error"
                },
                {
                  "name": "gzipReader.Close"
                },
                {
                  "name": "gzipReader.Read"
                },
                {
                  "name": "headerFieldNameError.Error"
                },
                {
                  "name": "headerFieldValueError.Error"
                },
                {
                  "name": "netHTTPClientConn.Close"
                },
                {
                  "name": "netHTTPClientConn.RoundTrip"
                },
                {
                  "name": "noDialClientConnPool.GetClientConn"
                },
                {
                  "name": "noDialH2RoundTripper.NewClientConn"
                },
                {
                  "name": "noDialH2RoundTripper.RoundTrip"
                },
                {
                  "name": "pipe.Read"
                },
                {
                  "name": "priorityWriteSchedulerRFC7540.CloseStream"
                },
                {
                  "name": "priorityWriteSchedulerRFC7540.OpenStream"
                },
                {
                  "name": "priorityWriteSchedulerRFC9218.OpenStream"
                },
                {
                  "name": "pseudoHeaderError.Error"
                },
                {
                  "name": "requestBody.Close"
                },
                {
                  "name": "requestBody.Read"
                },
                {
                  "name": "responseWriter.Flush"
                },
                {
                  "name": "responseWriter.FlushError"
                },
                {
                  "name": "responseWriter.Push"
                },
                {
                  "name": "responseWriter.SetReadDeadline"
                },
                {
                  "name": "responseWriter.SetWriteDeadline"
                },
                {
                  "name": "responseWriter.Write"
                },
                {
                  "name": "responseWriter.WriteHeader"
                },
                {
                  "name": "responseWriter.WriteString"
                },
                {
                  "name": "roundRobinWriteScheduler.OpenStream"
                },
                {
                  "name": "serverConn.CloseConn"
                },
                {
                  "name": "serverConn.Flush"
                },
                {
                  "name": "stickyErrWriter.Write"
                },
                {
                  "name": "transportResponseBody.Close"
                },
                {
                  "name": "transportResponseBody.Read"
                },
                {
                  "name": "unencryptedTransport.RoundTrip"
                },
                {
                  "name": "writeData.String"
                }
              ],
              "vendor": "golang.org/x/net",
              "versions": [
                {
                  "lessThan": "0.51.0",
                  "status": "affected",
                  "version": "0.50.0",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Due to missing nil check, sending 0x0a-0x0f HTTP/2 frames will cause a running server to panic"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "description": "CWE-476: NULL Pointer Dereference",
                  "lang": "en"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-02-26T18:50:31.830Z",
            "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
            "shortName": "Go"
          },
          "references": [
            {
              "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27141"
            },
            {
              "url": "https://go.dev/cl/746180"
            },
            {
              "url": "https://go.dev/issue/77652"
            },
            {
              "url": "https://pkg.go.dev/vuln/GO-2026-4559"
            }
          ],
          "title": "Sending certain HTTP/2 frames can cause a server to panic in golang.org/x/net"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "assignerShortName": "Go",
        "cveId": "CVE-2026-27141",
        "datePublished": "2026-02-26T18:50:31.830Z",
        "dateReserved": "2026-02-17T19:57:28.435Z",
        "dateUpdated": "2026-02-27T19:11:57.260Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.