CVE-2026-77301
Description
A flaw was found in adm-zip, a JavaScript library for handling ZIP archives. The getData() function in zipEntry.js allocates memory based on the declared uncompressed size in a ZIP entry's central directory without validating this value against the actual compressed data. A remote attacker can exploit this by providing a specially crafted, small ZIP file that declares a multi-gigabyte uncompressed size. This can lead to excessive memory consumption, causing applications to terminate or suffer service-wide memory exhaustion, resulting in a Denial of Service (DoS).
Statement
Red Hat rates the impact of this vulnerability as Moderate because successful exploitation requires an application to ingest an untrusted archive and results solely in a denial of service through memory exhaustion, without compromising confidentiality or integrity. Within Red Hat environments, adm-zip is embedded as an internal dependency in containerized dashboards and developer utilities. As a result, excessive resource allocation remains constrained to the specific worker process or container parsing the file, mitigating wider system failure.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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