CVE-2026-106435Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Python Driver
Updated under an hour ago ()
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It affects MongoDB Python Driver. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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The MongoDB Python Driver's binary accelerator can read outside a buffer when an application decodes malformed BSON containing a truncated regular-expression element without a trailing NUL byte. An actor who can supply BSON to the documented decode or decode_all API can cause the application process to terminate when the C extension is loaded. The driver's normal database wire-protocol path does not reach this code.
- CVSS
- 5.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-125
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mongodb
- NVD analysis
- Analyzed
- Record last updated
- Oct 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
MongoDB Python Driver mongodb:python_driver (from the name) | from 0.10.3 through 4.18.2 | CNA record |
mongodb python_driver mongodb:python_driver | before 4.18.3 | NVD |
References
- https://jira.mongodb.org/browse/PYTHON-6110vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.