CVE-2026-29181
OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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 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.
| CWE | CWE-770 |
| Vendor | open-telemetry |
| Product | opentelemetry-go |
| Published | Apr 7, 2026 |
| Last Updated | Jul 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
open-telemetry / opentelemetry-go
>= 1.36.0, < 1.41.0
References
github.com: https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-29181 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2456252 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29181.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:25271