CVE-2026-50515: Deserialization of untrusted data in Azure Service Bus allows an authorized attacker to execute code over a ne

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CRITICAL 9.9WATCHLISTMITIGATE

CVE-2026-50515 is a critical-severity flaw (CVSS 9.9) affecting azure service bus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Deserialization of untrusted data in Azure Service Bus allows an authorized attacker to execute code over a network.

Why this priority

Critical severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-08-07
Last modified	2026-10-24

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-07 00:16 UTCPublished CVE record published
2026-10-24 16:10 UTCUpdated Record last modified

microsoft azure service bus MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy azure-service-bus || rpm -q azure-service-bus || azure-service-bus --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · pspp · FIXED · 2.1.3-2.fc46 · FEDORA-2026-0d6444911b · source

sudo dnf upgrade --advisory=FEDORA-2026-0d6444911b

Fedora ELN · barman · FIXED · 3.20.1-3.eln159 · FEDORA-2026-45ecf042c2 · source

sudo dnf upgrade --advisory=FEDORA-2026-45ecf042c2

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-2026-50515?

azure service bus: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-50515 being exploited?

CVE-2026-50515 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-2026-50515 affect?

CVE-2026-50515 affects azure service bus. Severity is critical (CVSS 9.9). Deserialization of untrusted data in Azure Service Bus allows an authorized attacker to execute code over a network.

How urgent is CVE-2026-50515?

Priority 59/100. Critical severity; On your watchlist

Software pages

Azure vulnerabilities

References

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