CVE-2026-31973
NULL pointer dereference in samtools cram-size
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
SAMtools is a program for reading, manipulating and writing bioinformatics file formats. Starting in version 1.17, in the cram-size command, used to write information about how well CRAM files are compressed, a check to see if the `cram_decode_compression_header()` was missing. If the function returned an error, this could lead to a NULL pointer dereference. Exploiting this bug causes a NULL pointer dereference. Typically this will cause the program to crash. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.
| CWE | CWE-476 |
| Vendor | samtools |
| Product | samtools |
| Published | Mar 18, 2026 |
| Last Updated | Mar 19, 2026 |
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Affected Versions
samtools / samtools
>= 1.17, < 1.21.1 >= 1.22, < 1.22.2 = 1.23