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Advisory record · GHSA-p9f8-wvj8-2fg8

OpenTelemetry-Go: UTF-8 replacement rune bypasses attribute length truncation

CVSS 5.1 MediumEPSS 0.0018 · 7th percentile

Published by the GitHub Advisory Database at 29 Sept 2026, 17:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
go.opentelemetry.io/otel/sdkGo>=1.10.0, <1.33.01.33.0
Identifiers
GHSA-p9f8-wvj8-2fg8 · CVE-2026-81869 · GO-2026-6616
Weakness (CWE)
CWE-176 · CWE-400
Tags
Published
29 Sept 2026
Updated
1 Oct 2026

Machine-written summary

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

Versions 1.10.0 up to but not including 1.33.0 of go.opentelemetry.io/otel/sdk do not fully enforce the AttributeValueLengthLimit setting on string span attributes that contain the Unicode replacement character U+FFFD. An attacker who can get attacker-controlled data recorded into span attributes, in a deployment where the limit is enabled, can cause oversized values to be stored untruncated, increasing per-span memory use. Upgrade to version 1.33.0 or later. The source gives no workaround.

Written 1 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
5.1 Medium 4.0 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0018, the 7th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 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.