{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-81869", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-27T17:48:42.120Z", "datePublished": "2026-09-16T20:41:15.806Z", "dateUpdated": "2026-09-17T14:15:51.501Z"}, "containers": {"cna": {"title": "OpenTelemetry-Go: UTF-8 replacement rune bypasses attribute length truncation", "problemTypes": [{"descriptions": [{"cweId": "CWE-176", "lang": "en", "description": "CWE-176: Improper Handling of Unicode Encoding", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 5.1, "baseSeverity": "MEDIUM", "vectorString": "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", "version": "4.0"}}], "references": [{"name": "https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-p9f8-wvj8-2fg8", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-p9f8-wvj8-2fg8"}, {"name": "https://github.com/open-telemetry/opentelemetry-go/issues/5996", "tags": ["x_refsource_MISC"], "url": "https://github.com/open-telemetry/opentelemetry-go/issues/5996"}, {"name": "https://github.com/open-telemetry/opentelemetry-go/pull/5997", "tags": ["x_refsource_MISC"], "url": "https://github.com/open-telemetry/opentelemetry-go/pull/5997"}, {"name": "https://github.com/open-telemetry/opentelemetry-go/commit/e016a78c9f5b24a1c2beeaad47686c2f2213f49a", "tags": ["x_refsource_MISC"], "url": "https://github.com/open-telemetry/opentelemetry-go/commit/e016a78c9f5b24a1c2beeaad47686c2f2213f49a"}, {"name": "https://github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/v1.33.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/v1.33.0"}], "affected": [{"vendor": "open-telemetry", "product": "opentelemetry-go", "versions": [{"version": ">= 1.10.0, < 1.33.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-16T20:41:15.806Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-p9f8-wvj8-2fg8", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-p9f8-wvj8-2fg8", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-17T14:15:41.862542Z", "id": "CVE-2026-81869", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-17T14:15:51.501Z"}}]}}

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{}

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