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CVE-2020-12135

bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and...

5.5 MediumFix available

bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and return values. In particular, the bson_ensure_space() parameter bytesNeeded could have an integer overflow via properly constructed bson input.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.17%Up 0.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 5.5

bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and return values. In particular, the bson_ensure_space() parameter bytesNeeded could have an integer overflow via properly constructed bson input.

Record
CVE-2020-12135
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness
CWE-190
Updated
2026-11-02
CVE List No score

bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and return values. In particular, the bson_ensure_space() parameter bytesNeeded could have an integer overflow via properly constructed bson input.

Record
CVE-2020-12135
Updated
2026-11-02
EUVDEUVD-2020-4450 No score

bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and return values. In particular, the bson_ensure_space() parameter bytesNeeded could have an integer overflow via properly constructed bson input.

Record
EUVD-2020-4450
Updated
2026-11-03
GitHub AdvisoriesGHSA-f54q-h8mw-5h8w No score

bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and...

bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and return values. In particular, the bson_ensure_space() parameter bytesNeeded could have an integer overflow via properly constructed bson input.

Record
GHSA-f54q-h8mw-5h8w
Updated
2026-11-02
OSV 5.5

bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and return values. In particular, the bson_ensure_space() parameter bytesNeeded could have an integer overflow via properly constructed bson input.

Record
CVE-2020-12135
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2020-12135 5.5

bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and return values. In particular, the bson_ensure_space() parameter bytesNeeded could have an integer overflow via properly constructed bson input.

Record
DEBIAN-CVE-2020-12135
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2020-12135 5.5

bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and return values. In particular, the bson_ensure_space() parameter bytesNeeded could have an integer overflow via properly constructed bson input.

Record
UBUNTU-CVE-2020-12135
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUSN-4450-1 No score

whoopsie vulnerabilities

Seong-Joong Kim discovered that Whoopsie incorrectly handled memory. A local attacker could use this issue to cause Whoopsie to consume memory, resulting in a denial of service. (CVE-2020-11937)

Seong-Joong Kim discovered that Whoopsie incorrectly handled parsing files. A local attacker could use this issue to cause Whoopsie to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-12135)

Seong-Joong Kim discovered that Whoopsie incorrectly handled memory. A local attacker could use this issue to cause Whoopsie to consume memory, resulting in a denial of service. (CVE-2020-15570)

Record
USN-4450-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
duo-unix
Debian:12
 All versions, plus listed versions
1.11.3-11.11.3-1.11.11.3-1.1~exp11.11.3-1.2
 None known
duo-unix
Debian:13
 All versions, plus listed versions
1.11.3-1.2
 None known
whoopsie
Ubuntu:16.04:LTS
 before 0.2.52.5ubuntu0.5, plus listed versions
0.2.490.2.500.2.510.2.520.2.52.1
Show 8 moreShow less
0.2.52.20.2.52.30.2.52.40.2.52.50.2.52.5ubuntu0.10.2.52.5ubuntu0.20.2.52.5ubuntu0.30.2.52.5ubuntu0.4
0.2.52.5ubuntu0.5
duo-unix
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.9.11-1
 None known
whoopsie
Ubuntu:18.04:LTS
 before 0.2.62ubuntu0.5, plus listed versions
0.2.580.2.590.2.59build10.2.600.2.62
Show 4 moreShow less
0.2.62ubuntu0.10.2.62ubuntu0.20.2.62ubuntu0.30.2.62ubuntu0.4
0.2.62ubuntu0.5
duo-unix
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.9.21-11.9.21-1build1
 None known
whoopsie
Ubuntu:20.04:LTS
 before 0.2.69ubuntu0.1, plus listed versions
0.2.660.2.670.2.680.2.69
0.2.69ubuntu0.1
duo-unix
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.9.21-1.11.11.3-1
 None known
duo-unix
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.11.3-11.11.3-1build1
 None known
duo-unix
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.11.3-1build11.11.3-1.11.11.3-1.1build11.11.3-1.1build2
 None known
Show 6 moreShow less
Affected packages
PackageAffectedFixed
duo-unix
Ubuntu:25.10
 All versions, plus listed versions
1.11.3-1.2
 None known
duo-unix
Ubuntu:26.10
 All versions, plus listed versions
1.11.3-1.2build11.11.3-1.2ubuntu1
 None known
duo-unix
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.11.3-1.21.11.3-1.2build1
 None known
whoopsie
Ubuntu:16.04:LTS
From an advisory covering 3 CVEs
 before 0.2.52.5ubuntu0.5, plus listed versions
0.2.490.2.500.2.510.2.520.2.52.1
Show 8 moreShow less
0.2.52.20.2.52.30.2.52.40.2.52.50.2.52.5ubuntu0.10.2.52.5ubuntu0.20.2.52.5ubuntu0.30.2.52.5ubuntu0.4
0.2.52.5ubuntu0.5
whoopsie
Ubuntu:18.04:LTS
From an advisory covering 3 CVEs
 before 0.2.62ubuntu0.5, plus listed versions
0.2.580.2.590.2.59build10.2.600.2.62
Show 4 moreShow less
0.2.62ubuntu0.10.2.62ubuntu0.20.2.62ubuntu0.30.2.62ubuntu0.4
0.2.62ubuntu0.5
whoopsie
Ubuntu:20.04:LTS
From an advisory covering 3 CVEs
 before 0.2.69ubuntu0.1, plus listed versions
0.2.660.2.670.2.680.2.69
0.2.69ubuntu0.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-12135 is a medium vulnerability (CVSS 5.5) in Mongodb C Driver, published April 24, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.17%, the 67th percentile. Fixed in whoopsie 0.2.52.5ubuntu0.5.

References

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