Heap-based Buffer Overflow in RPM Package Management System by Red Hat
CVE-2026-95520

7.1HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
29 September 2026

What is CVE-2026-95520?

A vulnerability exists within the RPM Package Management System that allows for a heap-based buffer overflow. This occurs when an untrusted RPM package with a declared RPMTAG_LONGFILESIZES value of 0xFFFFFFFFFFFFFFFF is processed. The flaw leads to an integer overflow in the iterReadArchiveNext() function, causing a buffer allocation to be reduced to a single byte. Consequently, an attacker can exploit this issue by writing data that exceeds the bounds of the buffer through the payload's independently-controlled cpio filesize field. This vulnerability can be triggered via commands such as rpm2cpio, rpm2archive, and rpm -qlvp when handling untrusted packages.

References

https://access.redhat.com/security/cve/CVE-2026-95520
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2537809
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank tao pan for reporting this issue.
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