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Advisory record · GHSA-cp6g-7hqx-qxhp

mongo-go-driver has Heap Out-of-Bounds Read in GSSAPI Error Handling

CVSS 6.9 MediumEPSS 0.0032 · 24th percentile

Published by the GitHub Advisory Database at 10 Feb 2026, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
go.mongodb.org/mongo-driverGo<1.17.71.17.7
go.mongodb.org/mongo-driver/v2Go<2.4.22.4.2
Identifiers
GHSA-cp6g-7hqx-qxhp · CVE-2026-2303 · GO-2026-5327
Weakness (CWE)
CWE-183
Tags
Published
10 Feb 2026
Updated
10 Sept 2026

Machine-written summary

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

Two packages are affected: go.mongodb.org/mongo-driver before 1.17.7 and go.mongodb.org/mongo-driver/v2 before 2.4.2. The flaw is a heap out-of-bounds read in the GSSAPI (Kerberos) authentication code, where error-message strings are assumed to be null-terminated, causing a read one byte past a heap buffer. The source gives few details on how an attacker would trigger this or what the read exposes. Upgrade to 1.17.7 or 2.4.2, depending on which module is in use.

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
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CNA (mongodb)
  • CISA KEV Not listed.
  • EPSS 0.0032, the 24th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:13 UTC First seen by agentprime
  2. 31 Oct 2026, 14:13 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.