CVE catalog

CVE-2026-106435

Severity: Medium · CVSS 5.9CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Oct 8, 2026, 8:12:15 PM UTC
Updated: Oct 8, 2026, 9:33:42 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.09% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	pymongo	sid	`4.19.0-1`	fixed
Debian	pymongo	forky	`4.19.0-1`	fixed
Debian	pymongo	trixie	`4.10.1-6`	vulnerable
Debian	pymongo	bookworm	`3.11.0-1+deb12u1`	vulnerable
Cpe	python_driver	Not reported	`4.18.3`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	pymongo	source	sid	`4.19.0-1`	not yet assigned	Not reported	[1150462]
Debian	pymongo	source	forky	`4.19.0-1`	not yet assigned	Not reported	[1150462]
Debian	pymongo	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1150462]
Debian	pymongo	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1150462]
Cpe	python_driver	cpe	Not reported	`4.18.3`	Not reported	NVD-CVE-2026-106435	Not reported

[Debian bug #1150462]

Notes

[trixie] pymongo: Minor issue [bookworm] pymongo: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[python3-bson]Affected
Source package: [pymongo]
Details (2)
- 3.11.0-1+deb12u1 · amd64 · bookworm
  Affected
  nvd · pymongo · debian · bookworm; nvd · pymongo · debian · 12
- 3.11.0-1+deb12u1 · arm64 · bookworm
  Affected
  nvd · pymongo · debian · bookworm; nvd · pymongo · debian · 12
[python3-bson-ext]Affected
Source package: [pymongo]
Details (1)
- 3.11.0-1+deb12u1 · amd64 · bookworm
  Affected
  nvd · pymongo · debian · bookworm; nvd · pymongo · debian · 12
[python3-gridfs]Affected
Source package: [pymongo]
Details (2)
- 3.11.0-1+deb12u1 · all · bookworm
  Affected
  nvd · pymongo · debian · bookworm; nvd · pymongo · debian · 12
- 3.11.0-1+deb12u1 · all · bookworm
  Affected
  nvd · pymongo · debian · bookworm; nvd · pymongo · debian · 12
[python3-pymongo]Affected
Source package: [pymongo]
Details (2)
- 3.11.0-1+deb12u1 · amd64 · bookworm
  Affected
  nvd · pymongo · debian · bookworm; nvd · pymongo · debian · 12
- 3.11.0-1+deb12u1 · arm64 · bookworm
  Affected
  nvd · pymongo · debian · bookworm; nvd · pymongo · debian · 12
[python3-pymongo-ext]Affected
Source package: [pymongo]
Details (1)
- 3.11.0-1+deb12u1 · amd64 · bookworm
  Affected
  nvd · pymongo · debian · bookworm; nvd · pymongo · debian · 12
[python-pymongo-doc]Affected
Source package: [pymongo]
Details (2)
- 3.11.0-1+deb12u1 · all · bookworm
  Affected
  nvd · pymongo · debian · bookworm; nvd · pymongo · debian · 12
- 3.11.0-1+deb12u1 · all · bookworm
  Affected
  nvd · pymongo · debian · bookworm; nvd · pymongo · debian · 12

[Debian 13 (Trixie)]

[python3-bson]Affected
Source package: [pymongo]
Details (2)
- 4.10.1-6 · all · trixie
  Affected
  nvd · pymongo · debian · 13
- 4.10.1-6 · all · trixie
  Affected
  nvd · pymongo · debian · 13
[python3-bson-ext]Affected
Source package: [pymongo]
Details (2)
- 4.10.1-6 · amd64 · trixie
  Affected
  nvd · pymongo · debian · 13
- 4.10.1-6 · arm64 · trixie
  Affected
  nvd · pymongo · debian · 13
[python3-gridfs]Affected
Source package: [pymongo]
Details (2)
- 4.10.1-6 · all · trixie
  Affected
  nvd · pymongo · debian · 13
- 4.10.1-6 · all · trixie
  Affected
  nvd · pymongo · debian · 13
[python3-pymongo]Affected
Source package: [pymongo]
Details (2)
- 4.10.1-6 · all · trixie
  Affected
  nvd · pymongo · debian · 13
- 4.10.1-6 · all · trixie
  Affected
  nvd · pymongo · debian · 13
[python3-pymongo-ext]Affected
Source package: [pymongo]
Details (2)
- 4.10.1-6 · amd64 · trixie
  Affected
  nvd · pymongo · debian · 13
- 4.10.1-6 · arm64 · trixie
  Affected
  nvd · pymongo · debian · 13
[python-pymongo-doc]Affected
Source package: [pymongo]
Details (2)
- 4.10.1-6 · all · trixie
  Affected
  nvd · pymongo · debian · 13
- 4.10.1-6 · all · trixie
  Affected
  nvd · pymongo · debian · 13

Observed: Oct 25, 2026, 7:45:38 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]