{"id":"CVE-2026-29181","summary":"OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)","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.","aliases":["GHSA-mh2q-q3fh-2475","GO-2026-5506"],"modified":"2026-07-24T19:11:21.784076941Z","published":"2026-04-07T20:29:13.933Z","related":["CGA-82cw-rccf-76r2","SUSE-SU-2026:2493-1","openSUSE-SU-2026:11173-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29181.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-770"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/open-telemetry/opentelemetry-go","events":[{"introduced":"a85ae98dcedc0761078518a715dea53e519b4846"},{"fixed":"4575a9774dd9415ffc858dd34955493b0031065a"}],"database_specific":{"source":["AFFECTED_FIELD","CPE_RANGE"],"cpe":"cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:go:*:*","extracted_events":[{"introduced":"1.36.0"},{"fixed":"1.41.0"}]}},{"type":"GIT","repo":"https://github.com/open-telemetry/opentelemetry-go-contrib","events":[{"introduced":"934fb13b40419cc512bb56556f77d29a2f29d202"},{"fixed":"07fa42463ccd05b067b0939aa4f1c57673ac6d6d"}],"database_specific":{"cpe":"cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:go:*:*","extracted_events":[{"introduced":"1.36.0"},{"fixed":"1.41.0"}],"source":"CPE_RANGE"}}],"versions":["v1.40.0","trace/v1.40.0","sdk/v1.40.0","sdk/metric/v1.40.0","sdk/log/v0.16.0","sdk/log/logtest/v0.16.0","metric/v1.40.0","log/v0.16.0","log/logtest/v0.16.0","exporters/zipkin/v1.40.0","exporters/stdout/stdouttrace/v1.40.0","exporters/stdout/stdoutmetric/v1.40.0","exporters/stdout/stdoutlog/v0.16.0","exporters/prometheus/v0.62.0","exporters/otlp/otlptrace/v1.40.0","exporters/otlp/otlptrace/otlptracehttp/v1.40.0","exporters/otlp/otlptrace/otlptracegrpc/v1.40.0","exporters/otlp/otlpmetric/otlpmetrichttp/v1.40.0","exporters/otlp/otlpmetric/otlpmetricgrpc/v1.40.0","exporters/otlp/otlplog/otlploghttp/v0.16.0","exporters/otlp/otlplog/otlploggrpc/v0.16.0","bridge/opentracing/v1.40.0","bridge/opencensus/v1.40.0","bridge/opencensus/test/v1.40.0","v1.39.0","trace/v1.39.0","sdk/v1.39.0","sdk/metric/v1.39.0","sdk/log/v0.15.0","sdk/log/logtest/v0.15.0","schema/v0.0.14","metric/v1.39.0","log/v0.15.0","log/logtest/v0.15.0","exporters/zipkin/v1.39.0","exporters/stdout/stdouttrace/v1.39.0","exporters/stdout/stdoutmetric/v1.39.0","exporters/stdout/stdoutlog/v0.15.0","exporters/prometheus/v0.61.0","exporters/otlp/otlptrace/v1.39.0","exporters/otlp/otlptrace/otlptracehttp/v1.39.0","exporters/otlp/otlptrace/otlptracegrpc/v1.39.0","exporters/otlp/otlpmetric/otlpmetrichttp/v1.39.0","exporters/otlp/otlpmetric/otlpmetricgrpc/v1.39.0","exporters/otlp/otlplog/otlploghttp/v0.15.0","exporters/otlp/otlplog/otlploggrpc/v0.15.0","bridge/opentracing/v1.39.0","bridge/opencensus/v1.39.0","bridge/opencensus/test/v1.39.0","v1.38.0","trace/v1.38.0","sdk/v1.38.0","sdk/metric/v1.38.0","sdk/log/v0.14.0","sdk/log/logtest/v0.14.0","schema/v0.0.13","metric/v1.38.0","log/v0.14.0","log/logtest/v0.14.0","exporters/zipkin/v1.38.0","exporters/stdout/stdouttrace/v1.38.0","exporters/stdout/stdoutmetric/v1.38.0","exporters/stdout/stdoutlog/v0.14.0","exporters/prometheus/v0.60.0","exporters/otlp/otlptrace/v1.38.0","exporters/otlp/otlptrace/otlptracehttp/v1.38.0","exporters/otlp/otlptrace/otlptracegrpc/v1.38.0","exporters/otlp/otlpmetric/otlpmetrichttp/v1.38.0","exporters/otlp/otlpmetric/otlpmetricgrpc/v1.38.0","exporters/otlp/otlplog/otlploghttp/v0.14.0","exporters/otlp/otlplog/otlploggrpc/v0.14.0","bridge/opentracing/v1.38.0","bridge/opencensus/v1.38.0","bridge/opencensus/test/v1.38.0","exporters/prometheus/v0.59.1","v1.37.0","trace/v1.37.0","sdk/v1.37.0","sdk/metric/v1.37.0","sdk/log/v0.13.0","sdk/log/logtest/v0.13.0","metric/v1.37.0","log/v0.13.0","log/logtest/v0.13.0","exporters/zipkin/v1.37.0","exporters/stdout/stdouttrace/v1.37.0","exporters/stdout/stdoutmetric/v1.37.0","exporters/stdout/stdoutlog/v0.13.0","exporters/prometheus/v0.59.0","exporters/otlp/otlptrace/v1.37.0","exporters/otlp/otlptrace/otlptracehttp/v1.37.0","exporters/otlp/otlptrace/otlptracegrpc/v1.37.0","exporters/otlp/otlpmetric/otlpmetrichttp/v1.37.0","exporters/otlp/otlpmetric/otlpmetricgrpc/v1.37.0","exporters/otlp/otlplog/otlploghttp/v0.13.0","exporters/otlp/otlplog/otlploggrpc/v0.13.0","bridge/opentracing/v1.37.0","bridge/opencensus/v1.37.0","bridge/opencensus/test/v1.37.0","sdk/log/v0.12.2","log/v0.12.2","exporters/stdout/stdoutlog/v0.12.2","exporters/otlp/ot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