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Advisory record · GHSA-pq59-9fq7-m886

Zope AccessControl vulnerable to information disclosure through Python string `format` and `format_map` functions

CVSS 6.8 MediumEPSS 0.0047 · 40th percentile

Published by the GitHub Advisory Database at 17 Sept 2026, 16:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
accesscontrolPyPI<7.47.4
Identifiers
GHSA-pq59-9fq7-m886 · CVE-2026-77401 · PYSEC-2026-4022
Weakness (CWE)
CWE-693
Tags
Published
17 Sept 2026
Updated
1 Oct 2026

Machine-written summary

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

Zope AccessControl (PyPI package accesscontrol) versions before 7.4 are vulnerable to information disclosure through Python's string format and format_map functions, including on subclasses of str. An attacker who can supply a format string in restricted code can read objects reachable through attribute access and subscription, bypassing AccessControl's policy checks. Upgrade to version 7.4, which contains the fix; the source lists 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
6.8 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0047, the 40th percentile, on 7 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.