How severe is CVE-2023-26966?

CVE-2023-26966 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-26966 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26966?

CVE-2023-26966 affects Libtiff. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26966?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-26966 published?

CVE-2023-26966 was published on 2023-06-29 and last updated on 2026-06-17.

CVE-2023-26966

CVE-2023-26966 is a medium-severity vulnerability in Libtiff with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Libtiff
Published: 2023-06-29
Last modified: 2026-06-17

Description

libtiff 4.5.0 is vulnerable to Buffer Overflow in uv_encode() when libtiff reads a corrupted little-endian TIFF file and specifies the output to be big-endian.

Frequently asked questions

What is CVE-2023-26966?: libtiff 4.5.0 is vulnerable to Buffer Overflow in uv_encode() when libtiff reads a corrupted little-endian TIFF file and specifies the output to be big-endian.
How severe is CVE-2023-26966?: CVE-2023-26966 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-26966 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26966?: CVE-2023-26966 affects Libtiff. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26966?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-26966 published?: CVE-2023-26966 was published on 2023-06-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libtiff:libtiff:4.5.0:-:*:*:*:*:*:*

More vulnerabilities in Libtiff

CVE-2004-0929 — Critical (CVSS 10.0): Heap-based buffer overflow in the OJPEGVSetField function in tif_ojpeg.c for libtiff 3.6.1 and earlier, when compiled…
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CVE-2016-9540 — Critical (CVSS 9.8): tools/tiffcp.c in libtiff 4.0.6 has an out-of-bounds write on tiled images with odd tile width versus image width.…
CVE-2016-9539 — Critical (CVSS 9.8): tools/tiffcrop.c in libtiff 4.0.6 has an out-of-bounds read in readContigTilesIntoBuffer(). Reported as MSVR 35092.
CVE-2016-9538 — Critical (CVSS 9.8): tools/tiffcrop.c in libtiff 4.0.6 reads an undefined buffer in readContigStripsIntoBuffer() because of a uint16 integer…
CVE-2016-9537 — Critical (CVSS 9.8): tools/tiffcrop.c in libtiff 4.0.6 has out-of-bounds write vulnerabilities in buffers. Reported as MSVR 35093, MSVR…

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