Signal is active with 3 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data. As one method of removing redundant data, CRAM uses reference-based compression so that instead of storing the full sequence for each alignment record it stores a location in an external reference sequence along with a list of differences to the reference at that location as a sequence of "features". When decoding these features, an out-by-one error in a test for CRAM features that appear beyond the extent of the CRAM record sequence could result in an invalid write of one attacker-controlled byte beyond the end of a heap buffer. Exploiting this bug causes a heap buffer overflow. If a user opens a file crafted to exploit this issue, it could lead to the program crashing, or overwriting of data and heap structures in ways not expected by the program. It may be possible to use this to obtain arbitrary code execution. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
1 version affected across 1 product
🚨 CYBERDUDEBIVASH SENTINEL APEX ALERT 🚨 Threat: CVE-2026-31963 - HTSlib CRAM reader has heap buffer overflow due to improper validation of input Intel Report: https://ift.tt/evH863G
Post summary
The tweet announces a new heap buffer overflow vulnerability (CVE-2026-31963) in HTSlib CRAM reader, offering a link to an Intel report for further details.
CVE-2026-31963 HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data. As one method of removi… https://www.cve.org/CVERecord?id=CVE-2026-31963
Post summary
The post announces CVE-2026-31963, noting it involves HTSlib’s handling of CRAM format, without providing further technical details, exploit code, or mitigation.
CVE-2026-31963 Heap Buffer Overflow in HTSlib CRAM Decoder Enables Potential Code Execu... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-31963 Vulnerability Notification: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=3
Post summary
A new heap buffer overflow vulnerability (CVE-2026-31963) in HTSlib's CRAM decoder is reported, indicating potential for code execution, but no PoC, exploit code, patch, or evidence of active exploitation is provided.
2 of 2 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | htslib | htslib | - | - | - |
| App | htslib | htslib | 1.23 | - | - |