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Not in CISA KEV
HIGH severity

Uncontrolled Resource Consumption in pillowGHSA-98vv-pw6r-q6q4

HIGHFix: python-pillow/Pillow@9e08eb8

GHSA-98vv-pw6r-q6q4 is a high-severity (CVSS 7.5) Out-of-bounds Read vulnerability in pillow. 1 public exploit reference exists, so weaponization risk is real. A fix is available for pillow — see the affected versions and patch details below.

Also known asBIT-pillow-2021-23437CVE-2021-23437PYSEC-2021-317SNYK-PYTHON-PILLOW-1319443
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs88th percentile — riskier than 88% of all scored CVEsHighest risk
0.00%1.36%2.71%4.07%0.2%3.2%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-98vv-pw6r-q6q4 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 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

The package pillow 5.2.0 and before 8.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) via the getrgb function.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIpillow≥ 5.2.0&&< 8.3.28.3.2pip install --upgrade 'pillow==8.3.2'

Affected Products

2 products · 3 configurations
OS
fedorafedoraproject
2 versions
3334
Application
pillowpython
≥ 5.2.0 && < 8.3.2
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The package pillow 5.2.0 and before 8.3.2 are vulnerable to Regular Expr…

snyk.ioNVDSep 2021

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 8.3.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-98vv-pw6r-q6q4 is resolved across your whole dependency graph.

  3. Workarounds

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Frequently Asked Questions

The package pillow 5.2.0 and before 8.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) via the getrgb function.
O3 Security · Impact-Aware SCA

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Uncontrolled Resource Consumption in pillow (High 7.5)