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Fencer Vulns
medium 6.5

CVE-2026-2303 json

Heap Out-of-Bounds Read in Go Driver GSSAPI C Wrappers enables application crash or information leak

published 2026-02-10 8 mo ago modified 2026-09-10 1 mo ago also GHSA-cp6g-7hqx-qxhp , GO-2026-5327 , EUVD-2026-7065

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

The mongo-go-driver repository contains CGo bindings for GSSAPI (Kerberos) authentication on Linux and macOS. The C wrapper implementation contains a heap out-of-bounds read vulnerability due to incorrect assumptions about string termination in the GSSAPI standard. Since GSSAPI buffers are not guaranteed to be null-terminated or have extra padding, this results in reading one byte past the allocated heap buffer.

Patch / fix

  • go go.mongodb.org/mongo-driver 1.17.7
  • go go.mongodb.org/mongo-driver/v2 2.4.2
  • MongoDB Inc MongoDB Go Driver 1.17.7, 2.4.2
  • golang-github-prometheus-prometheus SLE Module for Package Hub 15 SP7 3.13.2-150100.4.40.2
  • system-user-grafana SLE Module for Package Hub 15 SP7 1.0.0-150200.5.8.1
  • grafana SLE Module for Package Hub 15 SP7 12.4.10-150200.3.94.3
  • grafana Multi Linux Manager Tools SLE-15 12.4.10-150002.4.27.1
  • mgr-push Multi Linux Manager Tools SLE-15 5.2.5-150002.3.12.1
  • spacecmd Multi Linux Manager Tools SLE-15 5.2.10-150002.3.15.1
  • uyuni-tools Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 5.2.17-150002.3.20.1
  • venv-salt-minion Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 3006.0-150002.5.22.1

suse advisories SUSE-SU-2026:4606-1SUSE-SU-2026:4600-1SUSE-SU-2026:4585-1SUSE-SU-2026:24148-1SUSE-SU-2026:4408-1SUSE-SU-2026:23216-1

  • grafana openSUSE Leap 16.0 12.4.10-bp160.1.1
  • alloy openSUSE Leap 16.0 1.19.2-160000.1.1
  • golang-github-prometheus-alertmanager openSUSE Leap 16.0 0.33.1-bp160.1.1
  • golang-github-prometheus-alertmanager openSUSE Tumbleweed 0.34.1-2.1
  • alloy openSUSE Tumbleweed 1.19.2-1.1
  • grafana openSUSE Tumbleweed 12.4.10-1.1
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260727T201416-160000.1.1
  • apptainer openSUSE Leap 16.0 1.5.1-bp160.2.1

opensuse advisories openSUSE-SU-2026:22125-1openSUSE-SU-2026:22032-1openSUSE-SU-2026:22027-1openSUSE-SU-2026:12058-1openSUSE-SU-2026:11803-1openSUSE-SU-2026:11684-1

  • keda Azure Linux 3.0 2.14.1-11
  • telegraf CBL-Mariner 2.0 1.29.4-21
  • telegraf Azure Linux 3.0 1.31.0-15

azure linux advisories AZL-77525AZL-77547AZL-77559

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-2303 updated cvss 6.5

mongo-go-driver: heap-based buffer over-read in GSSAPI error handling

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.9 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 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CNA 4.0 6.9 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
go go.mongodb.org/mongo-driver
<1.17.7
1.17.7
go go.mongodb.org/mongo-driver/v2
<2.4.2
2.4.2

Affected products

  • MongoDB Inc MongoDB Go Driver

Classification

Weakness
  • CWE-183 Permissive List of Allowed Inputs

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.