CVE-2023-26733: Buffer Overflow vulnerability found in tinyTIFF v.3.0 allows a local attacker to cause a denial of service via

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HIGH 7.8DOWNGRADE

CVE-2023-26733 is a high-severity flaw (CVSS 7.8) affecting tinytiff. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer Overflow vulnerability found in tinyTIFF v.3.0 allows a local attacker to cause a denial of service via the TinyTiffReader_readNextFrame function in tinytiffreader.c file.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-120
Published	2023-04-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tinytiff project

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

Am I affected?

Timeline

2023-04-04 15:15 UTCPublished CVE record published
2026-06-17 05:43 UTCUpdated Record last modified

tinytiff project tinytiff DOWNGRADE

Affected: 3.0.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0.0.0 (Debian / Ubuntu)

apt-cache madison tinytiff sudo apt install tinytiff=<VERSION_BEFORE_3.0.0.0> sudo apt-mark hold tinytiff

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

dnf --showduplicates list tinytiff sudo dnf downgrade tinytiff-<VERSION_BEFORE_3.0.0.0> sudo dnf versionlock add tinytiff

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-2023-26733?

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

Is CVE-2023-26733 being exploited?

CVE-2023-26733 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-2023-26733 affect?

CVE-2023-26733 affects tinytiff. Severity is high (CVSS 7.8). Buffer Overflow vulnerability found in tinyTIFF v.3.0 allows a local attacker to cause a denial of service via the TinyTiffReader_readNextFrame function in tinytiffreader.c file.

How urgent is CVE-2023-26733?

Priority 40/100. High severity; Public exploit reference

Related CVEs

CVE-2023-1560 LOW 2.8 DOWNGRADE A vulnerability, which was classified as problematic, has been found in TinyTIFF 3.0.0.0

References

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