{"answers":{"affected":"3 open source packages ship an affected version, including go.opentelemetry.io/otel/sdk/log.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81872 exists.","fix":"Upgrade go.opentelemetry.io/otel/sdk/log to 0.21.0 or later.","what":"CVE-2026-81872 is a medium-severity denial of service vulnerability in open-telemetry opentelemetry-go, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-81872 and fix it if it is affected.\n\nWhat it is: CVE-2026-81872 is a medium-severity denial of service vulnerability in open-telemetry opentelemetry-go, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81872 exists.\n\nAffected packages and fixed versions:\n- go.opentelemetry.io/otel/sdk/log (Go): affected all versions; fixed in 0.21.0\n- go.opentelemetry.io/otel/sdk/log (Go): affected all versions; fixed in 0.21.0\n- go.opentelemetry.io/otel/sdk/log (Go): affected all versions; fixed in 0.21.0\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-2026-81872/ (Markdown: https://insights.sbomify.com/CVE-2026-81872/index.md)","id":"CVE-2026-81872","markdown":"https://insights.sbomify.com/CVE-2026-81872/index.md","name":"CVE-2026-81872","record":{"aliases":["AZL-103058","AZL-103113","CLEANSTART-2026-GU78315","CLEANSTART-2026-PZ05319","CLEANSTART-2026-RX61384","CLEANSTART-2026-XR03943","DEBIAN-CVE-2026-81872","ECHO-ba37-d18b-1de7","GHSA-hjf4-fphr-2h65","GO-2026-6615","MINI-22jf-rxjf-p9g5","MINI-2684-7h88-9p78","MINI-26fm-f43f-rpgh","MINI-2fh4-8j84-3gcv","MINI-38f2-6h2x-522j","MINI-3f6x-3c7x-wqjj","MINI-3fm9-5w8r-8hcq","MINI-3fph-g242-29wj","MINI-3g9r-xp3v-85hc","MINI-3h94-cjgv-pg32","MINI-3xxr-v8q5-vcp4","MINI-42mr-fxxc-c5jj","MINI-42q9-g53m-wc6x","MINI-43c5-h3rq-hjrm","MINI-46h8-q863-pj3r","MINI-47f6-m94h-p8rx","MINI-48fv-336w-f3fj","MINI-49p7-fgqx-wp2v","MINI-4hm8-cmmf-7383","MINI-4j7c-7485-qcp7","MINI-4q8r-pjjm-cpf4","MINI-4rmr-h5q6-g6w5","MINI-4xxw-vj83-9p3m","MINI-536m-6hf5-x82c","MINI-585m-qg8r-m56m","MINI-5fgg-2725-54hj","MINI-5hgj-86h4-97pj","MINI-5pvc-r2g4-2jqm","MINI-5q32-p6m8-cpmh","MINI-5r4v-7569-q8cr","MINI-6964-jr4w-x7mh","MINI-6f3p-jv45-r5f2","MINI-6jq8-rw9f-g8hp","MINI-6jr4-w9w5-vpcm","MINI-7556-3vm3-63jv","MINI-76f9-4xc6-rjpg","MINI-7cw2-cpm3-6h7v","MINI-7g4g-429f-j4jh","MINI-7h66-hvfr-597m","MINI-7hfg-hwxx-233j","MINI-7q6r-6r8j-xpmr","MINI-7v67-8qmx-2wv3","MINI-8qxf-w9cw-8jwp","MINI-92fp-26q7-23vp","MINI-97v5-w237-gfrx","MINI-98jp-fvhw-g86w","MINI-9g2c-m79x-x2wc","MINI-9jvh-76wm-xrxm","MINI-9jvw-rjqg-7qjf","MINI-9mfw-8g8p-9v76","MINI-9wj5-hphw-2x24","MINI-c33w-c37f-3663","MINI-cgrc-7rx5-75g7","MINI-crj8-85fh-7cgf","MINI-cv7p-5wj7-fwgm","MINI-f37j-wxf4-m8gr","MINI-f3hv-m77h-9vvp","MINI-fcvv-w24w-m3jc","MINI-fh28-27fp-4x8v","MINI-fh6g-gmp9-3hc5","MINI-fm75-jxg4-gjhq","MINI-fpmf-qg98-pqjv","MINI-g9rf-x4x8-29p9","MINI-g9xq-rmc9-p42p","MINI-gjvp-cq8x-jhfg","MINI-gxg8-mhv2-83xv","MINI-h48g-5p8q-372w","MINI-h928-9rvj-5qc6","MINI-hh5p-56mw-6h95","MINI-j3cw-jf8w-g5qf","MINI-jc56-h9hq-xj3x","MINI-jqqf-xp63-r84m","MINI-m2rx-hm9w-q2cx","MINI-mfpm-h9g8-39qf","MINI-mg85-8hqc-2gjx","MINI-mhwj-2j43-5w3g","MINI-mhx2-2xv4-289g","MINI-mjhw-w28v-3fhr","MINI-mv74-xp8p-gpwg","MINI-p5rw-r7gf-8vwr","MINI-p6j2-7vgj-gwxw","MINI-pjgw-7ph3-5rq3","MINI-pqp2-vhp7-7pfm","MINI-pwwv-6qq2-r4mm","MINI-q5mm-73jg-wg9v","MINI-qh73-88q4-m2xc","MINI-qqjp-6chq-h7j7","MINI-qw3w-wq8j-757m","MINI-r3w9-fgfw-h6m6","MINI-r5r6-prq4-m52p","MINI-r957-wf6f-2gjg","MINI-rgvj-gj3f-rr7r","MINI-rx6h-m67m-4v8h","MINI-vhmh-gr8j-qf86","MINI-vjf4-2pmv-8f99","MINI-vpg6-7567-jc95","MINI-w245-9vj3-32rq","MINI-w5v8-8pf4-pmxr","MINI-w6ff-mp67-2rjc","MINI-w7vj-chm7-895r","MINI-w93f-9qhv-9v2m","MINI-wfp3-86r9-r756","MINI-wwh9-3crv-g4vg","MINI-x774-hmcp-2x2f","MINI-x8q2-jg5p-w83q","MINI-xfhf-569r-qx3c","MINI-xmf8-qp6m-mhpm","MINI-xv22-5r46-9j7j","UBUNTU-CVE-2026-81872"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Go logging library","requires_auth":"none","summary":"An attacker can cause a denial of service by filling the log export buffer, triggering a CPU busy-spin in the OpenTelemetry-Go BatchProcessor.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-834","name":"Excessive Iteration"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to version 0.21.0, the go.opentelemetry.io/otel/sdk/log BatchingProcessor can enter a tight CPU loop when attacker-driven log emission fills its asynchronous export buffer while the exporter is backpressured. NewBatchingProcessor wraps the exporter with newBufferExporter(exporter, 1), and the poll loop calls queue.TryDequeue and bufferExporter.EnqueueExport before immediately signaling pollTrigger whenever the queue remains at or above batchSize. Because a failed nonblocking EnqueueExport leaves the queue length unchanged, the processor repeatedly retries without waiting for its ticker, exhausting CPU and degrading or denying service in the embedding process. This issue is fixed in version 0.21.0.","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: BatchProcessor can busy-spin when export buffer is full","id":"CVE-2026-81872","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":"HAPI FHIR: SHCParser unbounded DEFLATE decompression causes denial of service","id":"CVE-2026-81875"},"packages":[{"ecosystem":"Go","fixed":["0.21.0"],"introduced":["0"],"last_affected":[],"package":"go.opentelemetry.io/otel/sdk/log","purl":null,"source":"GHSA-hjf4-fphr-2h65"},{"ecosystem":"Go","fixed":["0.21.0"],"introduced":["0"],"last_affected":[],"package":"go.opentelemetry.io/otel/sdk/log","purl":"pkg:golang/go.opentelemetry.io/otel/sdk/log","source":"GHSA-hjf4-fphr-2h65"},{"ecosystem":"Go","fixed":["0.21.0"],"introduced":["0"],"last_affected":[],"package":"go.opentelemetry.io/otel/sdk/log","purl":"pkg:golang/go.opentelemetry.io/otel/sdk/log","source":"GO-2026-6615"}],"prev":{"headline":"OpenTelemetry-Go: Log gRPC exporter ignores env TLS certs, bypassing mTLS/pinning","id":"CVE-2026-81871"},"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":"An attacker can cause a denial of service by filling the log export buffer, triggering a CPU busy-spin in the OpenTelemetry-Go BatchProcessor.","url":"https://insights.sbomify.com/CVE-2026-81872/"}