Reference page — cumulative record through Thursday, August 20, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-29181

CVE-2026-29181HIGH

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   .0057   44.8     —

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 19  EXPLOIT PUBLISHED — CVE-2026-29181 (open-telemetry opentelemetry-go). Public exploit reference added.

CWE-770 · CNA: GitHub_M · CVSS v3.1 · 6 references · NVD status: Modified

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 — 3 events, chronological
Date	Event	Detail
March 4, 2026	Reserved	Reserved by GitHub_M
April 7, 2026	Published	Published (CNA: GitHub_M)
August 19, 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	—

Weaknesses

CWE-770

References (6)

https://access.redhat.com/errata/RHSA-2026:25271 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2026:47735 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/security/cve/CVE-2026-29181 [vdb-entry, x_refsource_REDHAT]
https://bugzilla.redhat.com/show_bug.cgi?id=2456252 [issue-tracking, x_refsource_REDHAT]
https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475 [x_refsource_CONFIRM]
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29181.json [x_sadp-csaf-vex]

Authoritative record: CVE-2026-29181 at cve.org

Vendors: open-telemetry

Weaknesses: CWE-770

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 Thursday, August 20, 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.