CVE-2026-4775: A flaw was found in the libtiff library

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HIGH 7.8WATCHLISTUPGRADEMITIGATEUPGRADE

CVE-2026-4775 is a high-severity flaw (CVSS 7.8) affecting libtiff, debian linux, ai inference server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations, potentially causing a denial of service (application crash) or arbitrary code execution.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-03-24
Last modified	2026-10-26

Publisher (CNA): Red Hat, Inc. · Vendor: debian · libtiff · redhat

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 15:16 UTCPublished CVE record published
2026-10-26 19:13 UTCUpdated Record last modified

libtiff libtiff UPGRADE

Affected: < 4.7.2

Fixed in: 4.7.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.7.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libtiff

Note

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

debian debian linux MITIGATE

Affected: 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

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.

redhat ai inference server UPGRADE

Affected: >= 3.2.0 and < 3.2.2 · >= 3.3.0 and < 3.3.5

Fixed in: 3.2.2, 3.3.5

Safe to downgrade to: a release before 3.2.0

1. Check installed version

apt-cache policy ai-inference-server || rpm -q ai-inference-server || ai-inference-server --version

2. UPGRADE to 3.2.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ai-inference-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ai-inference-server

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.2.0 (Debian / Ubuntu)

apt-cache madison ai-inference-server sudo apt install ai-inference-server=<VERSION_BEFORE_3.2.0> sudo apt-mark hold ai-inference-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ai-inference-server sudo dnf downgrade ai-inference-server-<VERSION_BEFORE_3.2.0> sudo dnf versionlock add ai-inference-server

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.

redhat codeready linux builder DOWNGRADE

Affected: 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

1. Check installed version

apt-cache policy codeready-linux-builder || rpm -q codeready-linux-builder || codeready-linux-builder --version

2. No fixed release: DOWNGRADE to a release before 8.0 (Debian / Ubuntu)

apt-cache madison codeready-linux-builder sudo apt install codeready-linux-builder=<VERSION_BEFORE_8.0> sudo apt-mark hold codeready-linux-builder

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

dnf --showduplicates list codeready-linux-builder sudo dnf downgrade codeready-linux-builder-<VERSION_BEFORE_8.0> sudo dnf versionlock add codeready-linux-builder

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.

redhat codeready linux builder eus DOWNGRADE

Affected: 9.4 · 9.6 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.4

1. Check installed version

apt-cache policy codeready-linux-builder-eus || rpm -q codeready-linux-builder-eus || codeready-linux-builder-eus --version

2. No fixed release: DOWNGRADE to a release before 9.4 (Debian / Ubuntu)

apt-cache madison codeready-linux-builder-eus sudo apt install codeready-linux-builder-eus=<VERSION_BEFORE_9.4> sudo apt-mark hold codeready-linux-builder-eus

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

dnf --showduplicates list codeready-linux-builder-eus sudo dnf downgrade codeready-linux-builder-eus-<VERSION_BEFORE_9.4> sudo dnf versionlock add codeready-linux-builder-eus

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.

redhat hardened images 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 hardened-images || rpm -q hardened-images || hardened-images --version

No fixed or unaffected release known

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

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:19363] Important: libtiff security update 2026-05-26

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-2026-4775?

libtiff: upgrade to 4.7.2; debian linux: mitigate or apply the listed mitigation; ai inference server: upgrade to 3.2.2, 3.3.5. Exact commands for each OS are on this page.

Is CVE-2026-4775 being exploited?

CVE-2026-4775 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-2026-4775 affect?

CVE-2026-4775 affects libtiff, debian linux, ai inference server. Severity is high (CVSS 7.8). A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds hea

How urgent is CVE-2026-4775?

Priority 44/100. High severity; On your watchlist

Software pages

Debian vulnerabilities

References

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