Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-29181
open-telemetry opentelemetry-go — OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U N N H 7.5 .0087 57.5 —
AFFECTED
Product Versions Fixed
opentelemetry-go >= 1.36.0, < 1.41.0 – —
TIMELINE
Mar 4 Reserved by GitHub_M
Apr 7 Published (CNA: GitHub_M)
Aug 20 EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added.
Aug 25 EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added.
Aug 27 EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added.
Aug 31 EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added.
Sep 4 EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added.
Sep 9 EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added.
Sep 11 EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added.
Description
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.
Lifecycle
Complete event history — 9 events, chronological
| Date | Event | Detail |
|---|
| March 4, 2026 | Reserved | Reserved by GitHub_M |
| April 7, 2026 | Published | Published (CNA: GitHub_M) |
| August 20, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added. |
| August 25, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added. |
| August 27, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added. |
| August 31, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added. |
| September 4, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added. |
| September 9, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added. |
| September 11, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| open-telemetry | opentelemetry-go | — | >= 1.36.0, < 1.41.0 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-29181 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
