{"schemaVersion":3,"id":"CVE-2026-81869","aliases":["UBUNTU-CVE-2026-81869","DEBIAN-CVE-2026-81869","GHSA-p9f8-wvj8-2fg8","GO-2026-6616","CGA-457m-89jc-pq3g","CGA-76gm-w799-vgvf","CGA-76qv-f999-2hj5","CGA-7jwm-4qc4-7rfw","CGA-884g-r74v-8w74","CGA-c865-j42m-6757","CGA-fxm4-mc2v-g924","CGA-j224-m5jc-hq3c","CGA-jm9w-8q52-m8m9","CGA-rqff-g4r4-cpj2","CGA-wr7r-cgp5-43jq","CGA-xpgf-gfjp-6749"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-09-16T20:41:15.806Z","modified":"2026-09-17T14:15:51.501Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.1,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":5.1,"severity":"medium","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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":5.1,"severity":"medium","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","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · 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