# CVE-2026-16517 — Red Hat Enterprise Linux 10

> As of 2026-07-22, CVE-2026-16517 is a LOW-severity vulnerability in Red Hat Enterprise Linux 10, CVSS v3.1 2.9, EPSS 0.0% (4.4th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-16517 as of 2026-07-22; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-22

## What is CVE-2026-16517?

A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header function in archive_write_set_format_zip.c, when ZIP encryption is enabled and the entry file size is close to INT64_MAX, the addition of the encryption overhead to the entry size overflows int64_t, resulting in undefined behavior. This could lead to incorrect Zip64 extension decisions or potential memory corruption.

The record classifies CVE-2026-16517 under weakness class [CWE-190](https://intel.threadlinqs.com/cwe/CWE-190). Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs no user interaction. 7 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 76 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 2.9 — LOW (`CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **EPSS (FIRST):** 0.0% probability of exploitation in the next 30 days, higher than 4.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 1.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-21, last modified 2026-07-22

## Is CVE-2026-16517 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Red Hat](https://intel.threadlinqs.com/vendors/red-hat): Enterprise Linux 10, Enterprise Linux 6, Enterprise Linux 7, Enterprise Linux 8, Enterprise Linux 9, Hardened Images, OpenShift Container Platform 4

## How to fix CVE-2026-16517

No vendor patch reference has been recorded for CVE-2026-16517 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-16517

No threat campaign in the Threadlinqs corpus currently references CVE-2026-16517, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-07-23.

**Vendor advisory and patch**

- [access.redhat.com — vendor advisory](https://access.redhat.com/errata/RHSA-2026:43818)

**Third-party advisory**

- [access.redhat.com — vdb entry](https://access.redhat.com/security/cve/CVE-2026-16517)
- [bugzilla.redhat.com — issue tracking](https://bugzilla.redhat.com/show_bug.cgi?id=2505492)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-16517
Full detection coverage and IOCs for threats exploiting CVE-2026-16517 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp