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Not in CISA KEV
HIGH severity

Out of bounds read in PillowGHSA-mvg9-xffr-p774

HIGHFix: python-pillow/Pillow@8b8076b

GHSA-mvg9-xffr-p774 is a high-severity (CVSS 7.5) Out-of-bounds Read vulnerability in pillow. A fix is available for pillow — see the affected versions and patch details below.

Also known asBIT-pillow-2021-25291CVE-2021-25291PYSEC-2021-37
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs72th percentile — riskier than 72% of all scored CVEsHighest risk
0.04%0.67%1.30%1.93%0.5%1.4%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-mvg9-xffr-p774 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍pillow

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in Pillow before 8.2.0. In TiffDecode.c, there is an out-of-bounds read in TiffreadRGBATile via invalid tile boundaries.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIpillowall versions8.2.0pip install --upgrade 'pillow==8.2.0'

Affected Products

1 product · 1 configurations
Application
pillowpython
< 8.1.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pillow, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update pillow to 8.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mvg9-xffr-p774 is resolved across your whole dependency graph.

  3. Workarounds

    Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

This issue does not affect the versions of python-pillow as shipped with Red Hat Enterprise Linux 8 as it does not include the vulnerable code, which was introduced in a newer upstream version than what what shipped.

Workaround published by Red Hat
Disable the invoice generation feature to mitigate this vulnerability in Red Hat Quay.
Source: Red Hat security advisory for GHSA-mvg9-xffr-p774 (CC BY 4.0)
ProductFixed inAdvisory
Red Hat Quay 3quay/quay-rhel8:v3.6.0-62RHSA-2021:3917

Frequently Asked Questions

An issue was discovered in Pillow before 8.2.0. In `TiffDecode.c`, there is an out-of-bounds read in `TiffreadRGBATile` via invalid tile boundaries.
O3 Security · Impact-Aware SCA

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Out of bounds read in Pillow (High 7.5)