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Medium

OpenTelemetry-Go: UTF-8 replacement rune bypasses attribute length truncation

Type: advisorySources: OSV

OpenTelemetry-Go is the Go implementation of OpenTelemetry. From version 1.10.0 until 1.33.0, the sdk/trace/span.go attribute truncation path can fail to enforce AttributeValueLengthLimit for string and string-slice attributes containing the valid Unicode replacement character U+FFFD. safeTruncateValidUTF8 treats the valid replacement rune as invalid UTF-8 and returns the original input, while strings.ToValidUTF8 leaves that valid rune unchanged, so a second safeTruncate attempt can also return the oversized value. An attacker who controls span attribute content can retain values longer than the configured limit, increasing per-span memory use and weakening denial-of-service protection in the instrumented process. This issue is fixed in version 1.33.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-81869
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 03:34 UTC · Revision 1

Source evidence

OpenTelemetry-Go: UTF-8 replacement rune bypasses attribute length truncation

core-osv · Original source

Published 16 Sept 2026, 20:41 UTC

OpenTelemetry-Go is the Go implementation of OpenTelemetry. From version 1.10.0 until 1.33.0, the sdk/trace/span.go attribute truncation path can fail to enforce AttributeValueLengthLimit for string and string-slice attributes containing the valid Unicode replacement character U+FFFD. safeTruncateValidUTF8 treats the valid replacement rune as invalid UTF-8 and returns the original input, while strings.ToValidUTF8 leaves that valid rune unchanged, so a second safeTruncate attempt can also return the oversized value. An attacker who controls span attribute content can retain values longer than the configured limit, increasing per-span memory use and weakening denial-of-service protection in the instrumented process. This issue is fixed in version 1.33.0.

osv:CVE-2026-81869
Complete source record
{
  "id": "d31c33d1a0048eb6e283620b1cb8e0b8de747c9dfa1f44563e71d8f3dd4bbfe5",
  "url": "https://osv.dev/vulnerability/CVE-2026-81869",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OpenTelemetry-Go: UTF-8 replacement rune bypasses attribute length truncation",
    "summary": "OpenTelemetry-Go is the Go implementation of OpenTelemetry. From version 1.10.0 until 1.33.0, the sdk/trace/span.go attribute truncation path can fail to enforce AttributeValueLengthLimit for string and string-slice attributes containing the valid Unicode replacement character U+FFFD. safeTruncateValidUTF8 treats the valid replacement rune as invalid UTF-8 and returns the original input, while strings.ToValidUTF8 leaves that valid rune unchanged, so a second safeTruncate attempt can also return the oversized value. An attacker who controls span attribute content can retain values longer than the configured limit, increasing per-span memory use and weakening denial-of-service protection in the instrumented process. This issue is fixed in version 1.33.0.",
    "evidence": "osv:CVE-2026-81869",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-81869",
      "aliases": [
        "CVE-2026-81869",
        "GHSA-p9f8-wvj8-2fg8",
        "GO-2026-6616"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open-telemetry/opentelemetry-go",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0e6f9c29c10d6078e8131418e1d1d166c7195d61"
                },
                {
                  "fixed": "8c38f80ec37ca5f5ef037c6b19997764926ba049"
                },
                {
                  "fixed": "e016a78c9f5b24a1c2beeaad47686c2f2213f49a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.10.0"
                      },
                      {
                        "fixed": "1.33.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e016a78c9f5b24a1c2beeaad47686c2f2213f49a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81869.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.846577952Z",
      "provider": "osv",
      "references": [
        "https://github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/v1.33.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81869.json",
        "https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-p9f8-wvj8-2fg8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-81869",
        "https://github.com/open-telemetry/opentelemetry-go/issues/5996",
        "https://github.com/open-telemetry/opentelemetry-go/commit/e016a78c9f5b24a1c2beeaad47686c2f2213f49a",
        "https://github.com/open-telemetry/opentelemetry-go/pull/5997"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-176",
          "CWE-400"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81869.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-81869",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500040,
  "published_at": "2026-09-16T20:41:15.806+00:00"
}