{"answers":{"affected":"3 open source packages ship an affected version, including go.opentelemetry.io/otel/sdk.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81869 exists.","fix":"Upgrade go.opentelemetry.io/otel/sdk to 1.33.0 or later.","what":"CVE-2026-81869 is a medium-severity denial of service vulnerability in open-telemetry opentelemetry-go, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-81869 and fix it if it is affected.\n\nWhat it is: CVE-2026-81869 is a medium-severity denial of service vulnerability in open-telemetry opentelemetry-go, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81869 exists.\n\nAffected packages and fixed versions:\n- go.opentelemetry.io/otel/sdk (Go): affected from 1.10.0; fixed in 1.33.0\n- go.opentelemetry.io/otel/sdk (Go): affected from 1.10.0; fixed in 1.33.0\n- go.opentelemetry.io/otel/sdk (Go): affected from 1.10.0; fixed in 1.33.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-81869/ (Markdown: https://insights.sbomify.com/CVE-2026-81869/index.md)","id":"CVE-2026-81869","markdown":"https://insights.sbomify.com/CVE-2026-81869/index.md","name":"CVE-2026-81869","record":{"aliases":["AZL-103073","AZL-103131","AZL-103143","AZL-103149","AZL-103155","AZL-103161","AZL-103170","AZL-103179","AZL-103191","AZL-103221","AZL-103233","AZL-103239","AZL-103245","AZL-103248","AZL-103257","DEBIAN-CVE-2026-81869","ECHO-86a3-f4f3-560d","GHSA-p9f8-wvj8-2fg8","GO-2026-6616","MINI-22j5-pjw7-mpf9","MINI-22p2-2w8h-f2cv","MINI-26rx-hv4q-c3r8","MINI-27h3-83wj-8jx5","MINI-2f9g-4m2j-6r46","MINI-2xpw-2fj9-9m46","MINI-35j6-6mwh-qrjw","MINI-37cp-64fx-29p2","MINI-3p9h-r852-8j7m","MINI-3qwf-v5fj-h32p","MINI-3wjr-4442-fjf9","MINI-42jp-3pqc-63v5","MINI-445m-f89f-ch4m","MINI-47p3-x874-h5qw","MINI-4mh6-2p63-p4v6","MINI-4pcm-3h3j-3p89","MINI-577c-hqhw-wcwj","MINI-579w-8fw9-x759","MINI-57m6-38c7-w34x","MINI-59rf-554c-3fqh","MINI-5f6h-vhpc-vm59","MINI-5q5j-72x5-rq57","MINI-5rg3-qv9x-rh94","MINI-5x48-7xj2-87g4","MINI-6657-gmwv-vg34","MINI-66p4-9667-x68g","MINI-6hwv-9chg-9h9h","MINI-6jx9-g5px-m46p","MINI-6mxg-v2xx-7f8r","MINI-6vxr-936q-fv3g","MINI-735w-3qjh-qcjx","MINI-792h-q4v5-436p","MINI-797m-fj23-m6m8","MINI-7p5p-vf2g-rjw6","MINI-7r6v-8jf4-469p","MINI-7ww7-cwh3-2f2r","MINI-829c-8m6w-59rq","MINI-832f-w4g5-98v4","MINI-8728-f3wr-chrf","MINI-8xxw-jqfw-95m3","MINI-948h-g35v-f752","MINI-99h8-9w88-cfpm","MINI-9fwv-pmp8-fx84","MINI-9hgv-xj76-hf37","MINI-9j4h-fgf8-mr3j","MINI-9p36-xpc7-8p78","MINI-c372-x523-vr38","MINI-c4w8-283g-hh75","MINI-c9xm-p8vq-f7x8","MINI-cmp4-39ww-q5r6","MINI-cq24-jr9r-g6x9","MINI-crc9-ffqc-78hg","MINI-crwr-65fm-99vm","MINI-cw2x-rgfm-jh3q","MINI-cwmx-xvvf-vmjp","MINI-f497-xq62-247x","MINI-f52j-cjwm-gqjf","MINI-ffgg-qqwv-24cp","MINI-fj35-cq2c-hxfr","MINI-fjm9-wfc2-wjq6","MINI-fpvm-cfmm-84xq","MINI-fxwp-53gp-qhpq","MINI-g2rf-ff2p-j3vr","MINI-g7qw-8rhp-vr6v","MINI-gjqm-5gf2-qq27","MINI-grq8-qpxg-822m","MINI-h465-6574-592v","MINI-h62p-4c7j-8pfv","MINI-h69c-qpg3-cxwm","MINI-h858-8v8f-p339","MINI-hhf6-hj56-w79q","MINI-hvwp-p4hx-wh7f","MINI-j2wq-8p9r-gjvp","MINI-j48f-rqg7-jrqh","MINI-jcfh-h8fv-hjg4","MINI-jrgw-mj96-9rf8","MINI-jxjj-7447-gr69","MINI-m2rq-xv49-hvp8","MINI-mcrm-4w6x-pq7r","MINI-mgpv-g2xv-x7gc","MINI-mjh7-58v7-j825","MINI-mrc9-2v6p-4f4x","MINI-mxmx-7q8j-rg36","MINI-pcr3-3v58-xgqj","MINI-prxv-23m4-3qj7","MINI-pwqx-5pwr-4vqj","MINI-q463-8774-xgp4","MINI-q726-hxgm-68jm","MINI-qh22-g2j2-5cqr","MINI-qhrr-9pwj-72xq","MINI-r3wj-qxvh-j7cq","MINI-r886-pq3j-w35g","MINI-v283-hj73-7fhg","MINI-vp76-gvf9-v7w5","MINI-vv5f-5hq2-rcv6","MINI-w4g5-j3rj-fxf8","MINI-w532-4873-8jf4","MINI-w589-mhmw-2j4m","MINI-w62x-46wj-mh28","MINI-w928-8v5f-wpj2","MINI-wr7f-frgr-xm3j","MINI-x3jr-9jj3-68h6","MINI-x5jh-gpww-fmxc","MINI-x8rh-h2j7-62x2","MINI-x9h9-6c94-6rhj","MINI-xh4f-hp44-247q","MINI-xmp7-9h65-cpxj","MINI-xmr9-5m4j-xgpw","MINI-xpq6-rw7r-hx6x","MINI-xqfp-rfxh-2855","MINI-xqg8-php4-62cf","UBUNTU-CVE-2026-81869"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Go tracing library","requires_auth":"none","summary":"Attackers can bypass attribute length limits in OpenTelemetry-Go by using Unicode replacement characters, causing excessive memory consumption and potential denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.1,"severity":"medium","source":"cna","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","version":"4.0"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"},{"id":"CWE-176","name":"Improper Handling of Unicode Encoding"}],"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.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"OpenTelemetry-Go: UTF-8 replacement rune bypasses attribute length truncation","id":"CVE-2026-81869","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":5,"next":{"headline":"OpenTelemetry-Go: Exporter config logging may leak endpoint URLs in info logs","id":"CVE-2026-81870"},"packages":[{"ecosystem":"Go","fixed":["1.33.0"],"introduced":["1.10.0"],"last_affected":[],"package":"go.opentelemetry.io/otel/sdk","purl":null,"source":"GHSA-p9f8-wvj8-2fg8"},{"ecosystem":"Go","fixed":["1.33.0"],"introduced":["1.10.0"],"last_affected":[],"package":"go.opentelemetry.io/otel/sdk","purl":"pkg:golang/go.opentelemetry.io/otel/sdk","source":"GHSA-p9f8-wvj8-2fg8"},{"ecosystem":"Go","fixed":["1.33.0"],"introduced":["1.10.0"],"last_affected":[],"package":"go.opentelemetry.io/otel/sdk","purl":"pkg:golang/go.opentelemetry.io/otel/sdk","source":"GO-2026-6616"}],"prev":{"headline":"Steeltoe: Header-forwarded client cert lacks proof of private-key possession","id":"CVE-2026-81868"},"products":["opentelemetry-go"],"published":"2026-09-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-17","vendors":["open-telemetry"]},"summary":"Attackers can bypass attribute length limits in OpenTelemetry-Go by using Unicode replacement characters, causing excessive memory consumption and potential denial of service.","url":"https://insights.sbomify.com/CVE-2026-81869/"}