CVE-2026-41178 | OpenTelemetry-Go's baggage parsing no longer caps raw header length

OpenTelemetry-Go is the Go implementation of OpenTelemetry. Versions 1.41.0 and 1.43.0 removed raw-length rejection and it causes `Parse` to process arbitrarily large/invalid baggage headers and log errors, enabling DoS via oversized inputs. Versions 1.42.0 and 1.44.0 fix the issue.

Published: 2026-06-04 Last update: 2026-06-18 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-41178 is rated Low Risk (26.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.24%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-41178

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-23 0.42% 0.24% -0.18%
2 2026-06-15 0.05% 0.42% +0.37%
3 2026-06-10 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-41178

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2026-41178

GitHub Security Advisory for CVE-2026-41178

GHSA-5wrp-cwcj-q835 · Severity: medium · Ecosystem: go — opentelemetry-go's baggage parsing no longer caps raw header length

OS Trackers for CVE-2026-41178

vendor priority summary link
debian not yet assigned CVE-2026-41178 not yet assigned priority: Debian including 1 source packages (golang-opentelemetry-otel), 4 status rows across 4 suites (bookworm, forky, sid, trixie): open 4. https://security-tracker.debian.org/tracker/CVE-2026-41178
ubuntu medium CVE-2026-41178 medium priority: Ubuntu including 1 source packages (golang-opentelemetry-otel), 5 status rows across 5 suites (jammy, noble, questing, resolute, upstream): needs-triage 5. https://ubuntu.com/security/CVE-2026-41178

Affected software / configurations for CVE-2026-41178

Vendor Product Version Raw CPE
opentelemetry opentelemetry < 1.42.0 cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:go:*:*
opentelemetry opentelemetry 1.43.0 cpe:2.3:a:opentelemetry:opentelemetry:1.43.0:*:*:*:*:go:*:*

References for CVE-2026-41178

cvelogic Threat Intelligence