How severe is CVE-2026-40192?

CVE-2026-40192 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-40192 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40192?

CVE-2026-40192 affects Python Pillow. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40192?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40192 have an EU (EUVD) identifier?

Yes. CVE-2026-40192 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23130.

When was CVE-2026-40192 published?

CVE-2026-40192 was published on 2026-04-15 and last updated on 2026-07-02.

CVE-2026-40192

CVE-2026-40192 is a high-severity vulnerability in Python Pillow with a CVSS 3.x base score of 7.5. 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23130
Weakness: CWE-400
Affected product: Python Pillow
Published: 2026-04-15
Last modified: 2026-07-02

Description

Pillow is a Python imaging library. Versions 10.3.0 through 12.1.1 did not limit the amount of GZIP-compressed data read when decoding a FITS image, making them vulnerable to decompression bomb attacks. A specially crafted FITS file could cause unbounded memory consumption, leading to denial of service (OOM crash or severe performance degradation). If users are unable to immediately upgrade, they should only open specific image formats, excluding FITS, as a workaround.

Frequently asked questions

What is CVE-2026-40192?: Pillow is a Python imaging library. Versions 10.3.0 through 12.1.1 did not limit the amount of GZIP-compressed data read when decoding a FITS image, making them vulnerable to decompression bomb attacks. A specially crafted FITS file could cause unbounded memory consumption, leading to denial of service (OOM crash or severe performance degradation). If users are unable to immediately upgrade, they should only open specific image formats, excluding FITS, as a workaround.
How severe is CVE-2026-40192?: CVE-2026-40192 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-40192 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40192?: CVE-2026-40192 affects Python Pillow. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40192?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40192 have an EU (EUVD) identifier?: Yes. CVE-2026-40192 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23130.
When was CVE-2026-40192 published?: CVE-2026-40192 was published on 2026-04-15 and last updated on 2026-07-02.

References

Affected products (1)

cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*

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