Pillow is vulnerable to a FITS GZIP decompression bomb
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.7%
exploitation probability
0.7%top 51% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
python-pillow · PillowReferences
https://access.redhat.com/errata/RHSA-2026:16008https://access.redhat.com/errata/RHSA-2026:16009https://access.redhat.com/errata/RHSA-2026:16030https://access.redhat.com/errata/RHSA-2026:16174https://access.redhat.com/errata/RHSA-2026:17609https://access.redhat.com/errata/RHSA-2026:17611https://access.redhat.com/errata/RHSA-2026:19375https://access.redhat.com/errata/RHSA-2026:19712https://access.redhat.com/errata/RHSA-2026:21017https://access.redhat.com/errata/RHSA-2026:22465https://access.redhat.com/errata/RHSA-2026:22629https://access.redhat.com/errata/RHSA-2026:22840