# CVE-2026-95520: Rpm: rpm: integer overflow in iterreadarchivenext() leads to heap-based buffer overflow when parsing untrusted rpm packages

Status: published. Published: 2026-09-29. Updated: 2026-11-06.

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

- workaround: To reduce exposure, avoid processing or extracting RPM packages from untrusted sources. Do not use `rpm2cpio`, `rpm2archive`, or `rpm -qlvp` on RPM files whose origin and integrity cannot be verified. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (rpm): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (rpm): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (rpm): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (rpm): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (rpm): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Hardened Images (rpm): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.1 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.12% as of 2026-11-05; percentile 1.80%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-95520 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2537809 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-95520; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-95520; retrieved 2026-11-06; source updated Not reported

Revision: 88f74800cea59b81c084110c11f60b1cd7f38485ad3f32f6fbe625a64cdfe5a5

Canonical: https://y2.dev/cve/CVE-2026-95520

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