CVE-2026-51080: libpvestorage-perl v9.1.1 and libpve-storage-perl v8.3.7 were discovered to contain an XML External Entity (XX

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-51080 is a critical-severity flaw (CVSS 9.8) affecting libpve-storage-perl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libpvestorage-perl v9.1.1 and libpve-storage-perl v8.3.7 were discovered to contain an XML External Entity (XXE) vulnerability.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-611
Published	2026-07-17
Last modified	2026-08-11

Publisher (CNA): MITRE · Vendor: proxmox

Last updated 2026-08-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-17 14:17 UTCPublished CVE record published
2026-08-11 23:41 UTCUpdated Record last modified

proxmox libpve-storage-perl DOWNGRADE

Affected: 8.3.7 · 9.1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.3.7

1. Check installed version

apt-cache policy libpve-storage-perl || rpm -q libpve-storage-perl || libpve-storage-perl --version

2. No fixed release: DOWNGRADE to a release before 8.3.7 (Debian / Ubuntu)

apt-cache madison libpve-storage-perl sudo apt install libpve-storage-perl=<VERSION_BEFORE_8.3.7> sudo apt-mark hold libpve-storage-perl

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libpve-storage-perl sudo dnf downgrade libpve-storage-perl-<VERSION_BEFORE_8.3.7> sudo dnf versionlock add libpve-storage-perl

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-51080?

libpve-storage-perl: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-51080 being exploited?

CVE-2026-51080 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-51080 affect?

CVE-2026-51080 affects libpve-storage-perl. Severity is critical (CVSS 9.8). libpvestorage-perl v9.1.1 and libpve-storage-perl v8.3.7 were discovered to contain an XML External Entity (XXE) vulnerability.

How urgent is CVE-2026-51080?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Proxmox vulnerabilities · Perl vulnerabilities

References

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