HDF5 through 2.2.0 contains an out-of-bounds read vulnerability in H5Zfilterszip() in src/H5Zszip.c.
CVE-2026-120755
HDF5 through 2.2.0 contains an out-of-bounds read vulnerability in H5Zfilterszip() in src/H5Zszip.c. When decoding a szip-compressed chunk, the function subtracts the 4-byte uncompressed-length header from the chunk length without first verifying that the chunk is at least 4 bytes long. A truncated or corrupted chunk shorter than the header causes the length calculation to wrap around to a very large value, and the decompressor reads far past the end of the chunk buffer. An attacker who can get a user or application to read a dataset from a crafted HDF5 file can cause a denial of service. Only builds with szip support (libaec or the szip library) are affected.
Assessment
- CVSS
- 4.7 (v4.0)
- Severity
- Medium
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 3 November 2026
- Last updated
- 3 November 2026
- Affected
- The HDF Group · Szip Filter
- Assigner
- HDFG
CVSS vectorCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
At the source
References
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