{"id":"CVE-2026-81869","revision":"b24c8bd564dc471fba8ee96b59fa9b8a","records":[{"revision":"b24c8bd564dc471fba8ee96b59fa9b8a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-81869","aliases":[],"title":"OpenTelemetry-Go: UTF-8 replacement rune bypasses attribute length truncation","description":"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.","state":0,"publishedAt":"2026-09-16T20:41:15.806+00:00","modifiedAt":"2026-09-17T14:15:51.501+00:00","affected":[{"ecosystem":"Vendor product","name":"opentelemetry-go","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"open-telemetry\",\n                    \"product\": \"opentelemetry-go\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.10.0, < 1.33.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":5.1,"severity":"MEDIUM"}],"references":["https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-p9f8-wvj8-2fg8","https://github.com/open-telemetry/opentelemetry-go/issues/5996","https://github.com/open-telemetry/opentelemetry-go/pull/5997","https://github.com/open-telemetry/opentelemetry-go/commit/e016a78c9f5b24a1c2beeaad47686c2f2213f49a","https://github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/v1.33.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-81869","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-81869","identifiers":["CVE-2026-81869"]},"retained":false,"historicalAffected":[]}],"coverage":[]}