CVE-2026-55379High· 7.5▾ TwilightA flaw was found in Pillow, a Python imaging library. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by providing a specially crafted BDF font file. The library's image processing function fails to properly …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 13.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.4%
0.4% → 0.4%
Last analysed / modified upstream
A flaw was found in Pillow, a Python imaging library. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by providing a specially crafted BDF font file. The library's image processing function fails to properly validate dimensions from the font file, bypassing a critical security check designed to prevent excessive memory usage. This oversight can lead to the system consuming an unreasonable amount of memory, making it unavailable to legitimate users.
python-pillow: Pillow: Denial of Service via crafted BDF font file — rated Important by Red Hat. Released 2026-07-06, updated 2026-09-24.
Affected:
Fixed:
No fix planned:
Not affected:
For details on how to apply this update, refer to Ansible Automation Platform documentation. https://access.redhat.com/errata/RHSA-2026:50319 Before applying this update, make sure all previously released errata relevant to your system have been applied.
For detailed instructions how to apply this update, refer to:
https://docs.redhat.com/en/documentation/red_hat_satellite/6.16/html/updating_red_hat_satellite/index https://access.redhat.com/errata/RHSA-2026:50223 For details on how to apply this update, refer to Ansible Automation Platform documentation. https://access.redhat.com/errata/RHSA-2026:50336
Workarounds / mitigations:
Affected packages:
pillow < 12.3.0Patched in:
pillow 12.3.0Connected by shared product, vendor, weakness, or advisory.
CVE-2026-59200High· 7.5Pillow: Pillow: Denial of service via crafted PDF stream (CVE-2026-59200)
CVE-2026-59204High· 7.5Pillow: Pillow: Denial of Service via crafted JPEG2000 image (CVE-2026-59204)
CVE-2026-54283High· 7.5starlette: Starlette: request.form() limits silently ignored for application/x-www-form-urlencoded enable DoS (CVE-2026-54283)
CVE-2026-59885High· 7.5pyasn1: python-pyasn1: pyasn1: Denial of Service via crafted ASN.1 OBJECT IDENTIFIER (CVE-2026-59885)
CVE-2026-59197High· 8.2Pillow: Pillow: Native heap out-of-bounds write (CVE-2026-59197)
CVE-2026-54058Critical· 9.1Pillow: Pillow: Memory disclosure or denial of service via crafted McIdas AREA image (CVE-2026-54058)