CVE-2025-9165: A flaw has been found in LibTIFF 4.7.0

Routine

LOW 2.5DOWNGRADE

CVE-2025-9165 is a low-severity flaw (CVSS 2.5) affecting libtiff. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw has been found in LibTIFF 4.7.0. This affects the function _TIFFmallocExt/_TIFFCheckRealloc/TIFFHashSetNew/InitCCITTFax3 of the file tools/tiffcmp.c of the component tiffcmp. Executing manipulation can lead to memory leak. The attack is restricted to local execution. This attack is characterized by high complexity. It is indicated that the exploitability is difficult. The exploit has been published and may be used. There is ongoing doubt r

Why this priority

Public exploit reference

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

Risk facts

CVSS score	2.5 (Low)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-401, CWE-404
Published	2025-08-19
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: libtiff

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

Am I affected?

Timeline

2025-08-19 20:15 UTCPublished CVE record published
2026-06-17 10:08 UTCUpdated Record last modified

libtiff libtiff DOWNGRADE

Affected: 4.7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.7.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.7.0 (Debian / Ubuntu)

apt-cache madison libtiff sudo apt install libtiff=<VERSION_BEFORE_4.7.0> sudo apt-mark hold libtiff

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

dnf --showduplicates list libtiff sudo dnf downgrade libtiff-<VERSION_BEFORE_4.7.0> sudo dnf versionlock add libtiff

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-2025-9165?

libtiff: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-9165 being exploited?

CVE-2025-9165 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-2025-9165 affect?

CVE-2025-9165 affects libtiff. Severity is low (CVSS 2.5). A flaw has been found in LibTIFF 4.7.0. This affects the function _TIFFmallocExt/_TIFFCheckRealloc/TIFFHashSetNew/InitCCITTFax3 of the file tools/tiffcmp.c of the component tiffcmp. Executing manipulation can lead to memory leak. The attack

How urgent is CVE-2025-9165?

Priority 17/100. Public exploit reference

Related CVEs

CVE-2026-4775 HIGH 7.8 UPGRADE MITIGATE A flaw was found in the libtiff library
CVE-2023-52355 HIGH 7.5 UPGRADE MITIGATE An out-of-memory flaw was found in libtiff that could be triggered by passing a crafted tiff file to the TIFFR
CVE-2023-30086 MEDIUM 5.5 DOWNGRADE Buffer Overflow vulnerability found in Libtiff V.4.0.7 allows a local attacker to cause a denial of service vi
CVE-2023-3576 MEDIUM 5.5 UPGRADE MITIGATE A memory leak flaw was found in Libtiff's tiffcrop utility
CVE-2025-8961 LOW 3.3 DOWNGRADE A weakness has been identified in LibTIFF 4.7.0

References

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