{"answers":{"affected":"3 open source packages ship an affected version, including go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc.","exploited":"There is no known exploitation of CVE-2026-81871 in the wild and no public exploit code.","fix":"Upgrade go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc to 0.21.0 or later.","what":"CVE-2026-81871 is a medium-severity 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-2026-81871 and fix it if it is affected.\n\nWhat it is: CVE-2026-81871 is a medium-severity 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: There is no known exploitation of CVE-2026-81871 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc (Go): affected all versions; fixed in 0.21.0\n- go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc (Go): affected all versions; fixed in 0.21.0\n- go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc (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-2026-81871/ (Markdown: https://insights.sbomify.com/CVE-2026-81871/index.md)","id":"CVE-2026-81871","markdown":"https://insights.sbomify.com/CVE-2026-81871/index.md","name":"CVE-2026-81871","record":{"aliases":["AZL-103056","AZL-103110","CLEANSTART-2026-BF89402","CLEANSTART-2026-JK20975","CLEANSTART-2026-LW29584","CLEANSTART-2026-MT48554","CLEANSTART-2026-MX93537","CLEANSTART-2026-ND53090","CLEANSTART-2026-NU58137","CLEANSTART-2026-VN90217","CLEANSTART-2026-ZE06453","DEBIAN-CVE-2026-81871","ECHO-5145-560c-9d8e","GHSA-w34q-cm8f-9c5x","GO-2026-6508","MINI-23jr-6hcq-cpf7","MINI-23wc-95j8-r545","MINI-28pv-pv75-8wjv","MINI-2x2r-9xvg-5gwf","MINI-333c-fqj9-2f8f","MINI-365j-gg9f-r2mc","MINI-36jg-mmvr-3x75","MINI-39rw-8rcg-frrh","MINI-3m32-wvcj-wwjp","MINI-42g6-vr92-rf3v","MINI-4439-9xm8-9pjx","MINI-49gv-c98q-q862","MINI-4cq2-4gfq-4v9v","MINI-4wwh-8jf8-gm89","MINI-58qg-8jwc-mq58","MINI-5c6r-937f-fq6r","MINI-5h9c-8pgf-p94v","MINI-5jph-gppx-v3vx","MINI-64jj-v266-wrpq","MINI-65x6-hxvc-c7cr","MINI-69r7-3h69-qjv7","MINI-6h6f-qgm5-3ffw","MINI-6h95-x7c5-6ccw","MINI-6j5h-wcj7-9fx6","MINI-7469-vg39-mq53","MINI-74m8-m9m6-cj26","MINI-7f8v-v6q2-xjp4","MINI-7g5w-vw66-rqm6","MINI-7hvm-r4w7-9892","MINI-7q4p-4rxx-wr2w","MINI-7rmq-xjv7-5rrf","MINI-7xf9-wj92-3q8p","MINI-84jr-958c-jwgq","MINI-8c4g-8545-7vmf","MINI-8cfh-vhf5-5pp4","MINI-8gmq-h78j-wh59","MINI-8r8g-8m5m-m638","MINI-8v4g-r7c3-f68w","MINI-8vv2-24jx-426j","MINI-98w6-vfp3-pqhc","MINI-9j32-w8mp-4pxp","MINI-9jv6-mjfq-m7pq","MINI-9pwj-589h-2726","MINI-9vj3-3vr9-vrww","MINI-c2j4-9cqv-xchq","MINI-c2wc-7233-g838","MINI-cgpq-487v-3cpp","MINI-cw2p-cg8x-g5x3","MINI-f5xh-8q6w-p4pj","MINI-f963-rcg3-v6xr","MINI-g6jp-2g5r-3w9x","MINI-g7wj-h697-7g48","MINI-gqr8-6387-w9jp","MINI-h22h-gxjc-qmm3","MINI-h8vc-jqx3-cf8m","MINI-hc9x-vcjg-5wh8","MINI-hh55-6cc2-5j76","MINI-hj42-v5g9-xq2c","MINI-hm62-r93x-rfm4","MINI-hpw7-mm85-x2hx","MINI-hq4r-gpjf-g2pr","MINI-j67q-53jq-3whr","MINI-j74f-2fjw-r69f","MINI-j943-7rf6-2gc5","MINI-jhgg-gjc6-rf7h","MINI-jm76-8gqg-p238","MINI-jpxh-rp3p-jp95","MINI-jqgg-5xjf-33ch","MINI-jv92-2f25-x3r6","MINI-jxw5-49xg-cmrq","MINI-mj6j-g85f-r577","MINI-pjhq-hrmc-fcf5","MINI-q2xj-22c5-mfh2","MINI-qfcw-mfpw-h2g3","MINI-qqh9-3gv7-rpjq","MINI-qx2r-4cgg-6hc6","MINI-r3v8-5h36-rg7q","MINI-r6pj-6w3r-2wxw","MINI-r868-r6gx-wp69","MINI-r95m-wr22-93vj","MINI-rcfv-v89r-9hc8","MINI-rh3v-rp2h-p97g","MINI-rjv7-g4p3-q58c","MINI-rjvr-3ph7-fp2g","MINI-rmwr-5747-74rp","MINI-rqcp-fvh9-fw6r","MINI-v2w6-jrx3-5626","MINI-v58c-m7wm-8534","MINI-vw6c-85jh-x592","MINI-w5rp-gvvc-gqxx","MINI-w5wx-p36r-mcwg","MINI-wjvm-cffh-5pf6","MINI-x43v-g67q-qrjg","MINI-x4j4-q724-xr23","MINI-xf69-j572-4j9x","MINI-xjj2-xvqh-6hfr","MINI-xqvx-xvm4-cvhv","MINI-xr2m-mp5q-7jvj","RHSA-2026:68903","RHSA-2026:68912","RHSA-2026:68932","RHSA-2026:68941","RHSA-2026:74865","UBUNTU-CVE-2026-81871"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"yes","non_default_config":true,"product_category":"Go telemetry library","requires_auth":"none","summary":"Attacker can intercept or alter log telemetry by bypassing mTLS and certificate pinning when using environment-based TLS configuration in OpenTelemetry-Go.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"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:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-923","name":"Improper Restriction of Communication Channel to Intended Endpoints"},{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to version 0.21.0, the exporters/otlp/otlplog/otlploggrpc package loads OTEL_EXPORTER_OTLP_LOGS_CERTIFICATE, OTEL_EXPORTER_OTLP_CERTIFICATE, and related client certificate environment variables through loadEnvTLS into cfg.tlsCfg, but newGRPCDialOptions does not apply cfg.tlsCfg when creating gRPC transport credentials. The environment-only TLS path instead uses credentials.NewTLS with system roots and no configured client certificate, bypassing intended private CA pinning and mutual TLS unless the application also supplies WithTLSCredentials. A network attacker able to intercept or spoof the collector connection with a system-trusted certificate can read or alter log telemetry. This issue is fixed in version 0.21.0.","ecosystems":["Go","Red Hat:hummingbird:1"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"OpenTelemetry-Go: Log gRPC exporter ignores env TLS certs, bypassing mTLS/pinning","id":"CVE-2026-81871","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":12,"n_references":3,"next":{"headline":"OpenTelemetry-Go: BatchProcessor can busy-spin when export buffer is full","id":"CVE-2026-81872"},"packages":[{"ecosystem":"Go","fixed":["0.21.0"],"introduced":["0"],"last_affected":[],"package":"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc","purl":null,"source":"GHSA-w34q-cm8f-9c5x"},{"ecosystem":"Go","fixed":["0.21.0"],"introduced":["0"],"last_affected":[],"package":"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc","purl":"pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc","source":"GHSA-w34q-cm8f-9c5x"},{"ecosystem":"Go","fixed":["0.21.0"],"introduced":["0"],"last_affected":[],"package":"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc","purl":"pkg:golang/go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc","source":"GO-2026-6508"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:2.11.6-0.1.hum1"],"introduced":["0"],"last_affected":[],"package":"caddy","purl":"pkg:rpm/redhat/caddy","source":"RHSA-2026:74865"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:3.6.17-0.2.hum1"],"introduced":["0"],"last_affected":[],"package":"loki3.6","purl":"pkg:rpm/redhat/loki3.6","source":"RHSA-2026:68932"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:3.6.17-0.2.hum1"],"introduced":["0"],"last_affected":[],"package":"loki3.6-canary","purl":"pkg:rpm/redhat/loki3.6-canary","source":"RHSA-2026:68932"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:3.6.17-0.2.hum1"],"introduced":["0"],"last_affected":[],"package":"loki3.6-logcli","purl":"pkg:rpm/redhat/loki3.6-logcli","source":"RHSA-2026:68932"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:3.7.8-0.2.hum1"],"introduced":["0"],"last_affected":[],"package":"loki3.7","purl":"pkg:rpm/redhat/loki3.7","source":"RHSA-2026:68941"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:3.7.8-0.2.hum1"],"introduced":["0"],"last_affected":[],"package":"loki3.7-canary","purl":"pkg:rpm/redhat/loki3.7-canary","source":"RHSA-2026:68941"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:3.7.8-0.2.hum1"],"introduced":["0"],"last_affected":[],"package":"loki3.7-logcli","purl":"pkg:rpm/redhat/loki3.7-logcli","source":"RHSA-2026:68941"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:2.10.8-0.3.hum1"],"introduced":["0"],"last_affected":[],"package":"tempo2.10","purl":"pkg:rpm/redhat/tempo2.10","source":"RHSA-2026:68903"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:3.0.3-0.3.hum1"],"introduced":["0"],"last_affected":[],"package":"tempo3.0","purl":"pkg:rpm/redhat/tempo3.0","source":"RHSA-2026:68912"}],"prev":{"headline":"OpenTelemetry-Go: Exporter config logging may leak endpoint URLs in info logs","id":"CVE-2026-81870"},"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":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-17","vendors":["open-telemetry"]},"summary":"Attacker can intercept or alter log telemetry by bypassing mTLS and certificate pinning when using environment-based TLS configuration in OpenTelemetry-Go.","url":"https://insights.sbomify.com/CVE-2026-81871/"}