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Advisory record · GHSA-w9wp-h8wv-79jx

opentelemetry_sdk has unbounded memory allocation in W3C Baggage propagation

CVSS 5.3 MediumEPSS 0.0042 · 36th percentile

Published by the GitHub Advisory Database at 25 Jun 2026, 18:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
opentelemetry_sdkcrates.io<0.32.10.32.1
Identifiers
GHSA-w9wp-h8wv-79jx · CVE-2026-48504
Weakness (CWE)
CWE-770
Tags
Published
25 Jun 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

opentelemetry_sdk versions before 0.32.1 do not limit the size of inbound W3C baggage headers during extraction, so oversized headers cause unnecessary CPU work and heap allocation. An attacker who can send requests with untrusted propagation headers to a service using the SDK can degrade availability, with no data exposure or code execution. Upgrade to opentelemetry_sdk 0.32.1 or later, or reject inbound baggage headers larger than 8192 bytes before extraction.

Written 8 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0042, the 36th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:17 UTC First seen by agentprime
  2. 31 Oct 2026, 15:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.