{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:go:*:*",
            "extracted_events": [
              {
                "introduced": "1.36.0"
              },
              {
                "fixed": "1.41.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE"
            ]
          },
          "events": [
            {
              "introduced": "a85ae98dcedc0761078518a715dea53e519b4846"
            },
            {
              "fixed": "4575a9774dd9415ffc858dd34955493b0031065a"
            }
          ],
          "repo": "https://github.com/open-telemetry/opentelemetry-go",
          "type": "GIT"
        },
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:go:*:*",
            "extracted_events": [
              {
                "introduced": "1.36.0"
              },
              {
                "fixed": "1.41.0"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "934fb13b40419cc512bb56556f77d29a2f29d202"
            },
            {
              "fixed": "07fa42463ccd05b067b0939aa4f1c57673ac6d6d"
            }
          ],
          "repo": "https://github.com/open-telemetry/opentelemetry-go-contrib",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-mh2q-q3fh-2475"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29181.json"
  },
  "details": "OpenTelemetry-Go is the Go implementation of OpenTelemetry. From 1.36.0 to 1.40.0, multi-value baggage: header extraction parses each header field-value independently and aggregates members across values. This allows an attacker to amplify cpu and allocations by sending many baggage: header lines, even when each individual value is within the 8192-byte per-value parse limit. This vulnerability is fixed in 1.41.0.",
  "id": "CVE-2026-29181",
  "modified": "2026-07-27T03:56:37.765629819Z",
  "published": "2026-04-07T20:29:13.933Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29181.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:25271"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-29181"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29181.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29181"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456252"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)"
}