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Fencer Vulns
medium 4.8

CVE-2026-42250 json

Off-by-One Leading to Out-of-Bounds Write in bzip2

published 2026-05-28 5 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-32898

cvss
4.8
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

bzip2 contains an off‑by‑one error in the bzip2recover utility. When processing a specially crafted file, the application performs an out‑of‑bounds write to a global buffer, resulting in memory corruption and a crash (denial of service).

This issue was fixed in bzip2 patch 35d122a3df8b0cc4082a4d89fdc6ee99f375fe67

Patch / fix

  • bzip2 bzip2 35d122a3df8b0cc4082a4d89fdc6ee99f375fe67
  • bzip2 Ubuntu 22.04 LTS 1.0.8-5ubuntu0.1
  • bzip2 Ubuntu 24.04 LTS 1.0.8-5.1ubuntu0.1
  • bzip2 Ubuntu 26.04 LTS 1.0.8-6ubuntu0.1
  • bzip2 Ubuntu Pro 14.04 LTS 1.0.6-5ubuntu0.1~esm3
  • bzip2 Ubuntu Pro 16.04 LTS 1.0.6-8ubuntu0.2+esm1
  • bzip2 Ubuntu Pro 18.04 LTS 1.0.6-8.1ubuntu0.2+esm1
  • bzip2 Ubuntu Pro 20.04 LTS 1.0.8-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2026-42250

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bzip2 hummingbird 1 1.0.8-23.2.hum1
  • bzip2-libs hummingbird 1 1.0.8-23.2.hum1

red hat advisories RHSA-2026:30268

  • bzip2 SLE Module for Basesystem 15 SP7, SLE Micro 5.5, SLE Micro 5.4 +1 more 1.0.8-150400.3.4.1
  • bzip2 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.0.8-160000.3.1
  • bzip2 Linux Micro 6.0 1.0.8-4.1
  • bzip2 Linux Micro 6.1 1.0.8-slfo.1.1_2.1
  • bzip2 SLES LTSS Extended Security 12 SP5 1.0.6-30.17.1

suse advisories SUSE-SU-2026:4055-1SUSE-SU-2026:23494-1SUSE-SU-2026:23627-1SUSE-SU-2026:3925-1SUSE-SU-2026:23442-1SUSE-SU-2026:23415-1

  • bzip2 openSUSE Leap 16.0 1.0.8-160000.3.1
  • bzip2 openSUSE Tumbleweed 1.0.8-6.1

opensuse advisories openSUSE-SU-2026:21762-1openSUSE-SU-2026:11627-1

  • bzip2 Azure Linux 3.0 1.0.8-2
  • kata-containers-cc Azure Linux 3.0 3.15.0.aks0-15

azure linux advisories AZL-88809AZL-89190

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-2026-42250 updated cvss 5.0

bzip2: bzip2: Denial of Service in bzip2recover via a specially crafted file

  • Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-podvm-payload-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-to-dataverse-exporter-rhel9 Red Hat Pen Drive Powered by Red Hat Lightspeed pen-drive/pen-drive-scanner-rhel9 Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-27/hub-rhel9, ansible-automation-platform-26/gateway-rhel9, ansible-automation-platform-27/gateway-rhel9, ansible-automation-platform-26/mcp-tools-rhel9, ansible-automation-platform-27/mcp-tools-rhel9, +24 more Red Hat Ansible Automation Platform Ansible Core 2 ansible-automation-platform/ee-minimal-rhel8, ansible-automation-platform/ee-minimal-rhel9, ansible-automation-platform-tech-preview/ee-minimal-rhel8, ansible-automation-platform-tech-preview/ee-minimal-rhel9 Red Hat Discovery 2 discovery/discovery-server-rhel9
    +12 more products
    Red Hat Enterprise Linux 6 bzip2, bzip2-libs Red Hat Enterprise Linux 7 bzip2, bzip2-libs Red Hat Enterprise Linux 8 bzip2, mozjs60, bzip2-libs, mingw-bzip2, mingw32-bzip2, mingw64-bzip2 Red Hat Enterprise Linux 9 bzip2, goose, bzip2-libs, trustee-guest-components Red Hat Enterprise Linux 10 gjs, bzip2, goose, libkrun, trustee, rust-sequoia-sq, +1 more Red Hat OpenShift AI (RHOAI) rhoai/odh-ml-pipelines-runtime-generic-rhel9, rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9 Red Hat OpenShift Container Platform 4 kata-containers, openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 kata-containers, openshift/ose-rhel-coreos-9 Red Hat OpenShift Update Service openshift-update-service/openshift-update-service-rhel8 Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9 Red Hat Satellite 6 python-maturin, python3.12-maturin, satellite/iop-vmaas-rhel9, satellite/iop-advisor-engine-rhel9, satellite/iop-host-inventory-rhel9, satellite/iop-advisor-backend-rhel9, +1 more Red Hat Trusted Profile Analyzer rhtpa/rhtpa-trustification-service-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images bzip2 1.0.8-23.2.hum1, bzip2-libs 1.0.8-23.2.hum1
    fixed: vendor fix RHSA-2026:30268
  • Red Hat Hardened Images rust, rust-podman-sequoia Red Hat OpenShift AI (RHOAI) rhoai/odh-llm-d-inference-scheduler-rhel9, rhoai/odh-model-registry-job-async-upload-rhel9
    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
5 mo ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 4.8 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CNA 4.0 4.8 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/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

Affected products

  • bzip2 bzip2

Classification

Weakness

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.