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Fencer Vulns
high 8.1

CVE-2024-32655 json

Npgsql Vulnerable to SQL Injection via Protocol Message Size Overflow

published 2024-05-09 2 y ago modified 2026-09-10 1 mo ago also GHSA-x9vc-6hfv-hg8c , EUVD-2024-1856

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

Npgsql is the .NET data provider for PostgreSQL. The `WriteBind()` method in `src/Npgsql/Internal/NpgsqlConnector.FrontendMessages.cs` uses `int` variables to store the message length and the sum of parameter lengths. Both variables overflow when the sum of parameter lengths becomes too large. This causes Npgsql to write a message size that is too small when constructing a Postgres protocol message to send it over the network to the database. When parsing the message, the database will only read a small number of bytes and treat any following bytes as new messages while they belong to the old message. Attackers can abuse this to inject arbitrary Postgres protocol messages into the connection, leading to the execution of arbitrary SQL statements on the application's behalf. This vulnerability is fixed in 4.0.14, 4.1.13, 5.0.18, 6.0.11, 7.0.7, and 8.0.3.

Patch / fix

  • nuget Npgsql 4.0.14, 4.1.13, 5.0.18, 6.0.11, 7.0.7, 8.0.3
  • npgsql npgsql 4.0.14, 4.1.13, 5.0.18, 6.0.11, 8.0.3

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

1.72% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
nuget Npgsql
>=8.0.0, <8.0.3
<4.0.14
>=4.1.0, <4.1.13
>=5.0.0, <5.0.18
>=6.0.0, <6.0.11
>=7.0.0, <7.0.7
8.0.3
4.0.14
4.1.13
5.0.18
6.0.11
7.0.7

Affected products

  • npgsql npgsql

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound
  • CWE-89 Improper Neutralization of Special Elements used in an SQL Command

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.