CVE-2015-1859: Multiple buffer overflows in plugins/imageformats/ico/qicohandler.cpp in the QtBase module in Qt before 4.8.7

This month

MEDIUM 6.8MITIGATEUPGRADEDOWNGRADE

CVE-2015-1859 is a medium-severity flaw (CVSS 6.8) affecting fedora, qt, qt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple buffer overflows in plugins/imageformats/ico/qicohandler.cpp in the QtBase module in Qt before 4.8.7 and 5.x before 5.4.2 allow remote attackers to cause a denial of service (segmentation fault and crash) and possibly execute arbitrary code via a crafted ICO image.

Why this priority

EPSS top 6%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	6.5% (top 6%)
CISA exploited list	No
Weakness	CWE-119
Published	2015-05-12
Last modified	2026-06-17

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

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-05-12 19:59 UTCPublished CVE record published
2026-06-17 00:23 UTCUpdated Record last modified

fedoraproject fedora MITIGATE

Affected: 20 · 21 · 22

Fixed in: no fixed release known

Safe to downgrade to: a release before 20

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

digia qt UPGRADE

Affected: <= 4.8.6

Fixed in: newer than 4.8.6

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 4.8.6 (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: 5.0.0 · 5.0.1 · 5.0.2 · 5.1.0 · 5.2.0 · 5.2.1 · 5.3.0 · 5.4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)

apt-cache madison qt sudo apt install qt=<VERSION_BEFORE_5.0.0> sudo apt-mark hold qt

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

dnf --showduplicates list qt sudo dnf downgrade qt-<VERSION_BEFORE_5.0.0> 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-2015-1859?

fedora: mitigate or apply the listed mitigation; qt: upgrade to newer than 4.8.6; qt: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-1859 being exploited?

CVE-2015-1859 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-2015-1859 affect?

CVE-2015-1859 affects fedora, qt, qt. Severity is medium (CVSS 6.8). Multiple buffer overflows in plugins/imageformats/ico/qicohandler.cpp in the QtBase module in Qt before 4.8.7 and 5.x before 5.4.2 allow remote attackers to cause a denial of service (segmentation fault and crash) and possibly execute arbit

How urgent is CVE-2015-1859?

Priority 47/100. EPSS top 6%: very likely to be exploited

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References

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