CVE-2026-74767: Unbounded DAA Decompression in Pandora Allows Denial of Service via Decompression Bomb
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 maxextractedfilesize, 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Pandorato a version that resolves this vulnerability.Patch Unbounded DAA Decompression in Pandora Allows Denial of Service via Decompression Bomb - Configuration
Ensure Pandora’s DAA extraction uses bounded decompression by verifying cumulative decompressed chunk size and enforcing max_extracted_filesize (raising a dedicated ZipBomb exception when exceeded).
Pandora DAA extraction max_extracted_filesize = configured limit
Event History
Frequently Asked Questions
What is the severity of CVE-2026-74767?
CVE-2026-74767 has a risk rating of 29, indicating a potential for significant impact due to denial-of-service scenarios.
How do I fix CVE-2026-74767?
To fix CVE-2026-74767, ensure that you update Pandora to the latest version, which includes enhancements to limit decompressed data sizes.
What type of vulnerability is CVE-2026-74767?
CVE-2026-74767 is classified as a denial-of-service vulnerability related to unbounded decompression of DAA files.
What systems are affected by CVE-2026-74767?
CVE-2026-74767 affects the Pandora software that processes DAA (Direct Access Archive) files.
Can CVE-2026-74767 be exploited remotely?
Yes, CVE-2026-74767 can be exploited remotely by attackers who provide specially crafted DAA files to trigger the denial-of-service condition.