GO-2026-5506Published

OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)

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cve-program · CVE-2026-29181

Published

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.

Source published: 7 Apr 2026 20:29:13 UTC
Source modified: 17 Sep 2026 12:04:31 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

euvd · EUVD-2026-19938

Published

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Apr 7, 2026, 8:29:13 PM

dateUpdated: Sep 17, 2026, 12:04:31 PM

15 related source bulletins · separate from aliases

msrc_CVE-2026-29181: OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)

CVE-2026-29181

openSUSE-SU-2026:11173-1: etcd-3.6.13-1.1 on GA media

CVE-2026-29181 · CVE-2026-39883

RHSA-2026:63140: Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.19.2

CVE-2026-1965 · CVE-2026-3783 · CVE-2026-8286 · CVE-2026-9547 · CVE-2026-11822 · CVE-2026-11824 · CVE-2026-15588 · CVE-2026-29181 · CVE-2026-39883 · CVE-2026-58010 · CVE-2026-58011 · CVE-2026-58012 · CVE-2026-58013 · CVE-2026-58014 · CVE-2026-58015 · CVE-2026-58055

RHSA-2026:70870: Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.5.3

CVE-2026-18140 · CVE-2026-25681 · CVE-2026-27136 · CVE-2026-29181 · CVE-2026-33818 · CVE-2026-35469 · CVE-2026-39829 · CVE-2026-39830 · CVE-2026-39831 · CVE-2026-39832 · CVE-2026-41178 · CVE-2026-42151 · CVE-2026-42154 · CVE-2026-42502 · CVE-2026-42508 · CVE-2026-46595 · CVE-2026-46597 · CVE-2026-46600 · CVE-2026-46604 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862

RHSA-2026:66521: Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.6.1

CVE-2026-15792 · CVE-2026-17106 · CVE-2026-18140 · CVE-2026-29181 · CVE-2026-33818 · CVE-2026-35469 · CVE-2026-39828 · CVE-2026-39830 · CVE-2026-39831 · CVE-2026-39832 · CVE-2026-39835 · CVE-2026-41178 · CVE-2026-42508 · CVE-2026-46595 · CVE-2026-46597 · CVE-2026-46604 · CVE-2026-56852 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862 · CVE-2026-75593

RHSA-2026:47735: Red Hat Security Advisory: multicluster engine for Kubernetes v2.8.9 security update

CVE-2026-16242 · CVE-2026-17107 · CVE-2026-25681 · CVE-2026-27136 · CVE-2026-27145 · CVE-2026-29181 · CVE-2026-33811 · CVE-2026-39821 · CVE-2026-39828 · CVE-2026-39829 · CVE-2026-39830 · CVE-2026-39835 · CVE-2026-42508 · CVE-2026-44740 · CVE-2026-44990 · CVE-2026-45447 · CVE-2026-59869

RHSA-2026:83013: Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.0.17

CVE-2026-18140 · CVE-2026-25681 · CVE-2026-27136 · CVE-2026-29181 · CVE-2026-32283 · CVE-2026-32285 · CVE-2026-33186 · CVE-2026-33818 · CVE-2026-35469 · CVE-2026-41178 · CVE-2026-42151 · CVE-2026-42154 · CVE-2026-42499 · CVE-2026-42502 · CVE-2026-46600 · CVE-2026-56852 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862 · CVE-2026-63209 · CVE-2026-84445

RHSA-2026:72395: Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.20.1

CVE-2025-6170 · CVE-2026-1965 · CVE-2026-3783 · CVE-2026-5435 · CVE-2026-5928 · CVE-2026-6238 · CVE-2026-6653 · CVE-2026-8286 · CVE-2026-8458 · CVE-2026-8927 · CVE-2026-9547 · CVE-2026-11822 · CVE-2026-11824 · CVE-2026-11979 · CVE-2026-13757 · CVE-2026-14164 · CVE-2026-14456 · CVE-2026-14457 · CVE-2026-15588 · CVE-2026-16118 · CVE-2026-18798 · CVE-2026-29181 · CVE-2026-33186 · CVE-2026-39883 · CVE-2026-41989 · CVE-2026-46600 · CVE-2026-48864 · CVE-2026-54369 · CVE-2026-54370 · CVE-2026-54371 · CVE-2026-54874 · CVE-2026-56392 · CVE-2026-56852 · CVE-2026-56854 · CVE-2026-58010 · CVE-2026-58011 · CVE-2026-58012 · CVE-2026-58013 · CVE-2026-58014 · CVE-2026-58015 · CVE-2026-58016 · CVE-2026-58055 · CVE-2026-63072 · CVE-2026-63073 · CVE-2026-63074 · CVE-2026-63075 · CVE-2026-63076 · CVE-2026-63379 · CVE-2026-63381 · CVE-2026-63382 · CVE-2026-63383 · CVE-2026-63384 · CVE-2026-63385 · CVE-2026-63387 · CVE-2026-63388 · CVE-2026-81870 · CVE-2026-84445

WID-SEC-W-2026-3046: IBM Concert: Mehrere Schwachstellen

CVE-2019-19921 · CVE-2021-23337 · CVE-2024-3651 · CVE-2024-39338 · CVE-2024-45590 · CVE-2025-13465 · CVE-2025-15284 · CVE-2025-15599 · CVE-2025-22874 · CVE-2025-47273 · CVE-2025-47907 · CVE-2025-52881 · CVE-2025-53643 · CVE-2025-55184 · CVE-2025-58056 · CVE-2025-58188 · CVE-2025-58189 · CVE-2025-61723 · CVE-2025-61730 · CVE-2025-64649 · CVE-2025-64756 · CVE-2025-67221 · CVE-2025-68121 · CVE-2025-68146 · CVE-2026-0540 · CVE-2026-2327 · CVE-2026-23490 · CVE-2026-23897 · CVE-2026-2391 · CVE-2026-23949 · CVE-2026-24486 · CVE-2026-25528 · CVE-2026-25547 · CVE-2026-25639 · CVE-2026-25990 · CVE-2026-26007 · CVE-2026-26019 · CVE-2026-26996 · CVE-2026-27142 · CVE-2026-27212 · CVE-2026-27699 · CVE-2026-27903 · CVE-2026-27904 · CVE-2026-28684 · CVE-2026-29063 · CVE-2026-29181 · CVE-2026-2950 · CVE-2026-31808 · CVE-2026-31900 · CVE-2026-32274 · CVE-2026-32288 · CVE-2026-32597 · CVE-2026-32630 · CVE-2026-32887 · CVE-2026-32952 · CVE-2026-33186 · CVE-2026-33532 · CVE-2026-33750 · CVE-2026-33814 · CVE-2026-33816 · CVE-2026-33916 · CVE-2026-34043 · CVE-2026-34073 · CVE-2026-34077 · CVE-2026-3520 · CVE-2026-35469 · CVE-2026-35515 · CVE-2026-3627 · CVE-2026-39823 · CVE-2026-39825 · CVE-2026-39826 · CVE-2026-39892 · CVE-2026-39984 · CVE-2026-40175 · CVE-2026-40179 · CVE-2026-40181 · CVE-2026-40190 · CVE-2026-40347 · CVE-2026-41066 · CVE-2026-41182 · CVE-2026-41238 · CVE-2026-41239 · CVE-2026-41240 · CVE-2026-41305 · CVE-2026-41324 · CVE-2026-41425 · CVE-2026-41481 · CVE-2026-41488 · CVE-2026-41602 · CVE-2026-41636 · CVE-2026-42151 · CVE-2026-42154 · CVE-2026-42198 · CVE-2026-42211 · CVE-2026-42338 · CVE-2026-42342 · CVE-2026-42561 · CVE-2026-42577 · CVE-2026-43870 · CVE-2026-44405 · CVE-2026-44431 · CVE-2026-44432 · CVE-2026-44486 · CVE-2026-44487 · CVE-2026-44488 · CVE-2026-44492 · CVE-2026-44494 · CVE-2026-44496 · CVE-2026-44728 · CVE-2026-4539 · CVE-2026-45409 · CVE-2026-45736 · CVE-2026-46625 · CVE-2026-4800 · CVE-2026-4923 · CVE-2026-4926 · CVE-2026-7246 · CVE-2026-8723

RHSA-2026:25271: Red Hat Security Advisory: multicluster engine for Kubernetes v2.11.0 General Availability

CVE-2026-6322 · CVE-2026-29181 · CVE-2026-40895 · CVE-2026-42033 · CVE-2026-42035 · CVE-2026-42039 · CVE-2026-42041 · CVE-2026-42043 · CVE-2026-42044

RHSA-2026:72475: Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.20.1

RHSA-2026:61314: Red Hat Security Advisory: Cluster Observability Operator 1.5.2

CVE-2026-13676 · CVE-2026-27145 · CVE-2026-29181 · CVE-2026-32281 · CVE-2026-32285 · CVE-2026-35469 · CVE-2026-39829 · CVE-2026-39830 · CVE-2026-39831 · CVE-2026-39832 · CVE-2026-41178 · CVE-2026-42508 · CVE-2026-44740 · CVE-2026-46595 · CVE-2026-46597 · CVE-2026-46600 · CVE-2026-55677 · CVE-2026-56852 · CVE-2026-73643

RHSA-2026:68349: Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.2.13

CVE-2026-15792 · CVE-2026-18140 · CVE-2026-29181 · CVE-2026-32283 · CVE-2026-33818 · CVE-2026-35469 · CVE-2026-41178 · CVE-2026-42502 · CVE-2026-56852 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862

RHSA-2026:82322: Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.17.2

CVE-2024-34459 · CVE-2025-5278 · CVE-2025-6170 · CVE-2025-13151 · CVE-2025-14087 · CVE-2025-14512 · CVE-2025-47911 · CVE-2025-47913 · CVE-2025-47914 · CVE-2025-58181 · CVE-2025-58190 · CVE-2026-1965 · CVE-2026-2100 · CVE-2026-2673 · CVE-2026-3783 · CVE-2026-3832 · CVE-2026-3833 · CVE-2026-4046 · CVE-2026-4424 · CVE-2026-4437 · CVE-2026-4438 · CVE-2026-4878 · CVE-2026-5121 · CVE-2026-5260 · CVE-2026-5419 · CVE-2026-5435 · CVE-2026-5450 · CVE-2026-5928 · CVE-2026-6238 · CVE-2026-6653 · CVE-2026-7383 · CVE-2026-8286 · CVE-2026-9076 · CVE-2026-9547 · CVE-2026-11822 · CVE-2026-11824 · CVE-2026-11979 · CVE-2026-13757 · CVE-2026-14164 · CVE-2026-15588 · CVE-2026-16118 · CVE-2026-25680 · CVE-2026-25681 · CVE-2026-27135 · CVE-2026-27136 · CVE-2026-28390 · CVE-2026-29111 · CVE-2026-29181 · CVE-2026-31790 · CVE-2026-33186 · CVE-2026-33845 · CVE-2026-33846 · CVE-2026-34180 · CVE-2026-34181 · CVE-2026-34182 · CVE-2026-34183 · CVE-2026-39827 · CVE-2026-39828 · CVE-2026-39829 · CVE-2026-39830 · CVE-2026-39831 · CVE-2026-39832 · CVE-2026-39833 · CVE-2026-39834 · CVE-2026-39835 · CVE-2026-40355 · CVE-2026-40356 · CVE-2026-41989 · CVE-2026-42009 · CVE-2026-42010 · CVE-2026-42011 · CVE-2026-42012 · CVE-2026-42013 · CVE-2026-42014 · CVE-2026-42015 · CVE-2026-42502 · CVE-2026-42506 · CVE-2026-42508 · CVE-2026-42764 · CVE-2026-42766 · CVE-2026-42767 · CVE-2026-42768 · CVE-2026-42769 · CVE-2026-42770 · CVE-2026-45445 · CVE-2026-45446 · CVE-2026-45447 · CVE-2026-46595 · CVE-2026-46597 · CVE-2026-46598 · CVE-2026-46600 · CVE-2026-48864 · CVE-2026-54369 · CVE-2026-54370 · CVE-2026-54371 · CVE-2026-56854 · CVE-2026-56855 · CVE-2026-58010 · CVE-2026-58011 · CVE-2026-58012 · CVE-2026-58013 · CVE-2026-58014 · CVE-2026-58015 · CVE-2026-58016 · CVE-2026-58055 · CVE-2026-78662 · CVE-2026-84304 · CVE-2026-84445

RHSA-2026:82336: Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.17.1

CVE-2025-6170 · CVE-2026-1965 · CVE-2026-3783 · CVE-2026-5435 · CVE-2026-5928 · CVE-2026-6238 · CVE-2026-6653 · CVE-2026-8286 · CVE-2026-9547 · CVE-2026-11822 · CVE-2026-11824 · CVE-2026-11979 · CVE-2026-13757 · CVE-2026-14164 · CVE-2026-15588 · CVE-2026-16118 · CVE-2026-29181 · CVE-2026-41989 · CVE-2026-48864 · CVE-2026-54369 · CVE-2026-54370 · CVE-2026-54371 · CVE-2026-58010 · CVE-2026-58011 · CVE-2026-58012 · CVE-2026-58013 · CVE-2026-58014 · CVE-2026-58015 · CVE-2026-58016 · CVE-2026-58055

Source published: Apr 7, 2026, 8:29:13 PM (timezone not stated)
Source modified: Sep 17, 2026, 12:04:31 PM (timezone not stated)
Saved here: 11 Nov 2026 07:35:30 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd · CVE-2026-29181

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Modified

Weakness classifications: CWE-770

Original publisher date fields

published: 2026-04-07T21:17:16.003

lastModified: 2026-09-11T13:17:25.487

1 source CPE criteria · context only

cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:go:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 7 Apr 2026 21:17:16 UTC
Source modified: 11 Sep 2026 13:17:25 UTC
Saved here: 25 Oct 2026 07:19:08 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · [email protected] · Secondary · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

osv · GHSA-mh2q-q3fh-2475

Published

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. ## severity HIGH (availability / remote request amplification) ## relevant links - repository: https://github.com/open-telemetry/opentelemetry-go - pinned callsite: https://github.com/open-telemetry/opentelemetry-go/blob/1ee4a4126dbdd1bc79e9fae072fa488beffac52a/propagation/baggage.go#L58 ## vulnerability details **pins:** open-telemetry/opentelemetry-go@1ee4a4126dbdd1bc79e9fae072fa488beffac52a **as-of:** 2026-02-04 **policy:** direct (no program scope provided) **callsite:** propagation/baggage.go:58 (`extractMultiBaggage`) **attacker control:** inbound HTTP request headers (many `baggage` field-values) → `propagation.HeaderCarrier.Values("baggage")` → repeated `baggage.Parse` + member aggregation ### root cause `extractMultiBaggage` iterates over all `baggage` header field-values and parses each one independently, then appends members into a shared slice. the 8192-byte parsing cap applies per header value, but the multi-value path repeats that work once per header line (bounded only by the server/proxy header byte limit). ### impact in a default `net/http` configuration (max header bytes 1mb), a single request with many `baggage:` header field-values can cause large per-request allocations and increased latency. example from the attached PoC harness (darwin/arm64; 80 values; 40 requests): - canonical: `per_req_alloc_bytes=10315458` and `p95_ms=7` - control: `per_req_alloc_bytes=133429` and `p95_ms=0` ## proof of concept canonical: ```bash mkdir -p poc unzip poc.zip -d poc cd poc make test ``` output (excerpt): ``` [CALLSITE_HIT]: propagation/baggage.go:58 extractMultiBaggage [PROOF_MARKER]: baggage_multi_value_amplification p95_ms=7 per_req_alloc_bytes=10315458 per_req_allocs=16165 ``` control: ```bash cd poc make control ``` control output (excerpt): ``` [NC_MARKER]: baggage_single_value_baseline p95_ms=0 per_req_alloc_bytes=133429 per_req_allocs=480 ``` **expected:** multiple `baggage` header field-values should be semantically equivalent to a single comma-joined `baggage` value and should not multiply parsing/alloc work within the effective header byte budget. **actual:** multiple `baggage` header field-values trigger repeated parsing and member aggregation, causing high per-request allocations and increased latency even when each individual value is within 8192 bytes. ## fix recommendation avoid repeated parsing across multi-values by enforcing a global budget and/or normalizing multi-values into a single value before parsing. one mitigation approach is to treat multi-values as a single comma-joined string and cap total parsed bytes (for example 8192 bytes total). **fix accepted when:** under the default PoC harness settings, canonical stays within 2x of control for `per_req_alloc_bytes` and `per_req_allocs`, and `p95_ms` stays below 2ms. [poc.zip](https://github.com/user-attachments/files/25079945/poc.zip) [PR_DESCRIPTION.md](https://github.com/user-attachments/files/25079946/PR_DESCRIPTION.md)

Source published: 7 Apr 2026 20:12:57 UTC
Source modified: 10 Sep 2026 03:51:02 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Publisher rating · HIGH

osv · GO-2026-5506

Published

OpenTelemetry-Go: Multi-value baggage header extraction causes excessive allocations in go.opentelemetry.io/otel

Source published: 24 Jul 2026 18:35:55 UTC
Source modified: 6 Aug 2026 15:11:52 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.