{"id":"CVE-2026-29181","title":"OpenTelemetry-Go is the Go implementation of OpenTelemetry","summary":"OpenTelemetry-Go is the Go implementation of OpenTelemetry. From 1.36.0 to 1.40.0, multi-value baggage: header extraction parses each header field-value independently and aggregates members across values. This allows an attacker to ampli…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"vendor":"opentelemetry","product":"opentelemetry","affected":["opentelemetry >= 1.36.0, < 1.41.0"],"patched":["opentelemetry 1.41.0"],"published":"2026-04-07","updated":"2026-09-11","sourceUpdated":"2026-09-11T13:17:25.487","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-29181","references":[{"url":"https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:25271","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:47735","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:61314","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:63140","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:66521","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-29181","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2456252","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29181.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-29181"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29181"},{"url":"https://access.redhat.com/errata/RHSA-2026:68349"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-04-08T15:36:53.783712Z"},"epss":0.0079,"epssPercentile":0.54751,"ingestedAt":"2026-07-20T12:38:40.826Z","slug":"CVE-2026-29181","body":"## Overview\n\nOpenTelemetry-Go is the Go implementation of OpenTelemetry. From 1.36.0 to 1.40.0, multi-value baggage: header extraction parses each header field-value independently and aggregates members across values. This allows an attacker to amplify cpu and allocations by sending many baggage: header lines, even when each individual value is within the 8192-byte per-value parse limit. This vulnerability is fixed in 1.41.0.\n\n## Affected\n\n- `opentelemetry >= 1.36.0, < 1.41.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `opentelemetry 1.41.0`\n\n## Vendor advisories\n\n- **RHSA-2026:61314** · Red Hat · fixed in: Cluster Observability Operator 1.5.0 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61314)\n- **RHSA-2026:25271** · Red Hat · fixed in: multicluster engine for Kubernetes 2.11 · released 2026-06-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:25271)\n- **RHSA-2026:47735** · Red Hat · fixed in: multicluster engine for Kubernetes 2.8 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47735)\n- **Red Hat VEX** · Important · affected: cert-manager Operator for Red Hat OpenShift, Multicluster Engine for Kubernetes, Red Hat Advanced Cluster Management for Kubernetes 2 · no fix planned: Red Hat Advanced Cluster Management for Kubernetes 2, cert-manager Operator for Red Hat OpenShift, Multicluster Engine for Kubernetes · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29181.json)\n- **RHSA-2026:63140** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.19 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63140)\n- **RHSA-2026:66521** · Red Hat · fixed in: Logging Subsystem for Red Hat OpenShift 6.6 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66521)\n- **RHSA-2026:68349** · Red Hat · fixed in: Logging Subsystem for Red Hat OpenShift 6.2 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68349)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":12,"ransomware":0},"changes":[{"seq":201594,"id":"CVE-2026-29181","ts":1789399511433,"field":"exploit_available","old":"false","new":"true"},{"seq":200326,"id":"CVE-2026-29181","ts":1789397086864,"field":"exploit_available","old":"true","new":"false"},{"seq":198250,"id":"CVE-2026-29181","ts":1789391749861,"field":"exploit_available","old":"false","new":"true"},{"seq":196043,"id":"CVE-2026-29181","ts":1789383399954,"field":"exploit_available","old":"true","new":"false"},{"seq":194972,"id":"CVE-2026-29181","ts":1789380300975,"field":"exploit_available","old":"false","new":"true"},{"seq":193759,"id":"CVE-2026-29181","ts":1789378269472,"field":"exploit_available","old":"true","new":"false"},{"seq":192546,"id":"CVE-2026-29181","ts":1789376233841,"field":"exploit_available","old":"false","new":"true"},{"seq":191333,"id":"CVE-2026-29181","ts":1789373127157,"field":"exploit_available","old":"true","new":"false"},{"seq":190118,"id":"CVE-2026-29181","ts":1789369121577,"field":"exploit_available","old":"false","new":"true"},{"seq":188905,"id":"CVE-2026-29181","ts":1789368038918,"field":"exploit_available","old":"true","new":"false"},{"seq":187688,"id":"CVE-2026-29181","ts":1789364997007,"field":"exploit_available","old":"false","new":"true"},{"seq":186475,"id":"CVE-2026-29181","ts":1789363002976,"field":"exploit_available","old":"true","new":"false"},{"seq":185261,"id":"CVE-2026-29181","ts":1789360970213,"field":"exploit_available","old":"false","new":"true"},{"seq":184048,"id":"CVE-2026-29181","ts":1789357943960,"field":"exploit_available","old":"true","new":"false"},{"seq":182300,"id":"CVE-2026-29181","ts":1789354098388,"field":"exploit_available","old":"false","new":"true"},{"seq":181093,"id":"CVE-2026-29181","ts":1789352944043,"field":"exploit_available","old":"true","new":"false"},{"seq":179886,"id":"CVE-2026-29181","ts":1789350001675,"field":"exploit_available","old":"false","new":"true"},{"seq":178679,"id":"CVE-2026-29181","ts":1789347814887,"field":"exploit_available","old":"true","new":"false"},{"seq":177472,"id":"CVE-2026-29181","ts":1789346182185,"field":"exploit_available","old":"false","new":"true"},{"seq":176265,"id":"CVE-2026-29181","ts":1789342752547,"field":"exploit_available","old":"true","new":"false"},{"seq":176049,"id":"CVE-2026-29181","ts":1789342359060,"field":"exploit_available","old":"false","new":"true"},{"seq":175589,"id":"CVE-2026-29181","ts":1789338390550,"field":"exploit_available","old":"true","new":"false"},{"seq":174384,"id":"CVE-2026-29181","ts":1789334605254,"field":"exploit_available","old":"false","new":"true"},{"seq":173179,"id":"CVE-2026-29181","ts":1789333203326,"field":"exploit_available","old":"true","new":"false"},{"seq":171993,"id":"CVE-2026-29181","ts":1789330884990,"field":"exploit_available","old":"false","new":"true"},{"seq":170807,"id":"CVE-2026-29181","ts":1789328399443,"field":"exploit_available","old":"true","new":"false"},{"seq":169602,"id":"CVE-2026-29181","ts":1789326911411,"field":"exploit_available","old":"false","new":"true"},{"seq":168397,"id":"CVE-2026-29181","ts":1789323443929,"field":"exploit_available","old":"true","new":"false"},{"seq":167192,"id":"CVE-2026-29181","ts":1789319376718,"field":"exploit_available","old":"false","new":"true"},{"seq":165987,"id":"CVE-2026-29181","ts":1789318285677,"field":"exploit_available","old":"true","new":"false"},{"seq":164782,"id":"CVE-2026-29181","ts":1789315545736,"field":"exploit_available","old":"false","new":"true"},{"seq":163577,"id":"CVE-2026-29181","ts":1789313263740,"field":"exploit_available","old":"true","new":"false"},{"seq":162372,"id":"CVE-2026-29181","ts":1789311714898,"field":"exploit_available","old":"false","new":"true"},{"seq":161167,"id":"CVE-2026-29181","ts":1789308264945,"field":"exploit_available","old":"true","new":"false"},{"seq":160672,"id":"CVE-2026-29181","ts":1789304196366,"field":"exploit_available","old":"false","new":"true"},{"seq":158510,"id":"CVE-2026-29181","ts":1789299284872,"field":"exploit_available","old":"true","new":"false"},{"seq":157474,"id":"CVE-2026-29181","ts":1789296469205,"field":"exploit_available","old":"false","new":"true"},{"seq":156269,"id":"CVE-2026-29181","ts":1789294386854,"field":"exploit_available","old":"true","new":"false"},{"seq":155064,"id":"CVE-2026-29181","ts":1789292645132,"field":"exploit_available","old":"false","new":"true"},{"seq":153859,"id":"CVE-2026-29181","ts":1789289349992,"field":"exploit_available","old":"true","new":"false"},{"seq":153071,"id":"CVE-2026-29181","ts":1789285261404,"field":"exploit_available","old":"false","new":"true"},{"seq":148005,"id":"CVE-2026-29181","ts":1789270881924,"field":"exploit_available","old":"true","new":"false"},{"seq":146045,"id":"CVE-2026-29181","ts":1789269177966,"field":"exploit_available","old":"false","new":"true"},{"seq":144948,"id":"CVE-2026-29181"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