CVE-2010-5076: QSslSocket in Qt before 4.7.0-rc1 recognizes a wildcard IP address in the subject's Common Name field of an X.

Routine

MEDIUM 4.3UPGRADEDOWNGRADE

CVE-2010-5076 is a medium-severity flaw (CVSS 4.3) affecting qt, qt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

QSslSocket in Qt before 4.7.0-rc1 recognizes a wildcard IP address in the subject's Common Name field of an X.509 certificate, which might allow man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-20
Published	2012-06-29
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: digia · qt

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2012-06-29 19:55 UTCPublished CVE record published
2026-06-16 23:26 UTCUpdated Record last modified

digia qt UPGRADE

Affected: <= 4.6.4

Fixed in: newer than 4.6.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy qt || rpm -q qt || qt --version

2. UPGRADE to newer than 4.6.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade qt

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade qt

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

qt qt DOWNGRADE

Affected: 4.0.0 · 4.0.1 · 4.1.0 · 4.1.1 · 4.1.2 · 4.1.3 · 4.1.4 · 4.1.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.0

1. Check installed version

apt-cache policy qt || rpm -q qt || qt --version

2. No fixed release: DOWNGRADE to a release before 4.0.0 (Debian / Ubuntu)

apt-cache madison qt sudo apt install qt=<VERSION_BEFORE_4.0.0> sudo apt-mark hold qt

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

dnf --showduplicates list qt sudo dnf downgrade qt-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add qt

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-2010-5076?

qt: upgrade to newer than 4.6.4; qt: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2010-5076 being exploited?

CVE-2010-5076 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-2010-5076 affect?

CVE-2010-5076 affects qt, qt. Severity is medium (CVSS 4.3). QSslSocket in Qt before 4.7.0-rc1 recognizes a wildcard IP address in the subject's Common Name field of an X.509 certificate, which might allow man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by

How urgent is CVE-2010-5076?

Priority 38/100. Public exploit reference

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References

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