CVE-2026-74767
HighCVSS 8.7Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
Pandora contains a denial-of-service vulnerability in its handling of DAA (Direct Access Archive) files. When extracting the internal ISO image, compressed chunks are decompressed using zlib.decompress() without enforcing a limit on the resulting uncompressed data. An attacker can submit a crafted DAA file with highly compressed data, causing excessive memory and CPU consumption, potentially making the extraction worker unresponsive or terminating it, affecting service availability.
Risk Assessment
Risk of Pandora service unavailability, disrupting organizational operations and potentially causing financial or reputational damage.
Recommendation
Update Pandora to a patched version that introduces bounded decompression and raises a ZipBomb exception. Restrict DAA file uploads to trusted users only.
Original NVD description (English source)
Pandora contains a denial-of-service vulnerability in its handling of DAA (Direct Access Archive) files. When extracting the internal ISO image from a DAA archive, compressed chunks were decompressed using zlib.decompress() without enforcing a limit on the resulting uncompressed data. An attacker able to submit a crafted DAA file containing highly compressed data could cause Pandora to decompress a relatively small input into a very large amount of data in memory. Because the decompressed chunks are accumulated to construct the internal ISO image, this could result in excessive memory consumption and potentially CPU exhaustion, causing the extraction worker to become unresponsive, terminate, or affect the availability of the Pandora service. The patch introduces bounded decompression using decompressobj().decompress() with max_extracted_filesize, verifies the cumulative size of decompressed chunks, and raises a dedicated ZipBomb exception when the configured limit is exceeded. Pandora then aborts extraction and reports the file as too large.