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Advisory record · GHSA-g7f6-rxc4-qhph

Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint

CVSS 5.3 MediumEPSS 0.0053 · 44th percentile

Published by the GitHub Advisory Database at 23 Sept 2026, 19:01 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
mesopPyPI<1.3.41.3.4
Identifiers
GHSA-g7f6-rxc4-qhph · CVE-2026-93421 · PYSEC-2026-4105
Weakness (CWE)
CWE-117 · CWE-150
Tags
Published
23 Sept 2026
Updated
1 Oct 2026

Machine-written summary

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

Mesop versions before 1.3.4 are affected. The /__csp__ reporting endpoint writes fields from unauthenticated JSON reports to stdout without escaping control characters. A remote attacker can send a crafted request with ANSI/VT100 escape sequences that, when logs are viewed in an ANSI-capable terminal, can clear the screen, hide text, or show misleading messages. Upgrade to Mesop 1.3.4 or later.

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
5.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0053, the 44th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:09 UTC First seen by agentprime
  2. 31 Oct 2026, 14:09 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.