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libsolv EUVD-2026-31859

| CVE-2026-48864 HIGH
Out-of-bounds Write (CWE-787)
2026-05-26 redhat GHSA-2927-mfhv-37vh
Denial Of Service Information Disclosure Memory Corruption Buffer Overflow Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Hardened Images Red Hat Openshift Container Platform 4 Red Hat Satellite 6 Red Hat Update Infrastructure 4 For Cloud Providers
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
7.8 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jun 08, 2026 - 10:23 vuln.today
CVE Published
May 26, 2026 - 16:16 nvd
HIGH 7.8

DescriptionCVE.org

A flaw was found in libsolv. This heap buffer overflow occurs during the decompression of attacker-controlled compressed data within .solv files due to insufficient input validation. An attacker can provide a specially crafted .solv file, which, when processed by a vulnerable application, can lead to out-of-bounds memory access. This could result in information disclosure, alteration of program execution, or a denial of service.

AnalysisAI

Heap buffer overflow in libsolv allows local attackers to corrupt memory when a vulnerable application processes a maliciously crafted .solv repository metadata file. The flaw stems from insufficient input validation during decompression of attacker-controlled data, enabling information disclosure, control-flow alteration, or denial of service across multiple Red Hat Enterprise Linux releases and SUSE distributions. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Stage malicious .solv on attacker-controlled repo or mirror
Delivery
Lure victim or pipeline to sync metadata
Exploit
libsolv decompresses crafted compressed blob
Execution
Heap buffer overflow during parsing
Persist
Memory corruption alters execution or leaks data
Impact
Code execution or DoS in package tooling context
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to process an attacker-controlled .solv repository metadata file through a libsolv-linked tool such as DNF, Zypper, microdnf, or repository tooling inside OpenShift/Satellite - this is the UI:R condition. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 7.8 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) indicates local attack vector with required user interaction, which constrains real-world exploitability - a victim must process the malicious .solv file through a libsolv-consuming tool. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a malicious package repository or supplies a tampered .solv cache file (for example, via a compromised mirror, a poisoned container build context, or a crafted artifact in a CI pipeline). When a developer or administrator runs a package operation - such as DNF/Zypper repository refresh, an OpenShift image build, or a Satellite sync - libsolv parses the crafted compressed metadata and the heap buffer overflow triggers, yielding memory corruption that can disclose memory contents, alter execution, or crash the process. …
Remediation Apply the vendor-released patch by updating libsolv to the fixed package version delivered in RHSA-2026:21333 (https://access.redhat.com/errata/RHSA-2026:21333) and the corresponding SUSE security updates for openSUSE/SLES streams; rebuild or repull affected container images (OpenShift, Hardened Images) so the patched libsolv propagates into running workloads. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Inventory all systems running Red Hat Enterprise Linux and SUSE distributions; identify libsolv versions through package managers (rpm -q libsolv or zypper info libsolv). …

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed
SUSE Linux Enterprise Micro 5.4 Fixed
SUSE Linux Enterprise Micro 5.5 Fixed

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EUVD-2026-31859 vulnerability details – vuln.today
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