---
id: CVE-2026-95520
title: A heap-based buffer overflow flaw was found in rpm
summary: >-
  A heap-based buffer overflow flaw was found in rpm. Parsing a symlink entry in
  an untrusted RPM package whose declared RPMTAG_LONGFILESIZES value is
  0xFFFFFFFFFFFFFFFF causes an integer overflow in iterReadArchiveNext() that
  shrinks a bu…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H'
cwe:
  - CWE-787
vendor: Red Hat
product: rpm
affected:
  - rpm (all versions)
  - rpm
  - rpm
  - rpm (all versions)
  - rpm (all versions)
  - rpm (all versions)
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T21:29:07.663'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-95520'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-95520'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2537809'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-29T13:17:45.627559Z'
ingestedAt: '2026-09-29T11:32:41.245Z'
---

## Overview

A heap-based buffer overflow flaw was found in rpm. Parsing a symlink entry in an untrusted RPM package whose declared RPMTAG_LONGFILESIZES value is 0xFFFFFFFFFFFFFFFF causes an integer overflow in iterReadArchiveNext() that shrinks a buffer allocation to one byte, after which the payload's independently-controlled cpio filesize field is used to write attacker-controlled data past the end of that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an  untrusted package.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.