Npgsql Vulnerable to SQL Injection via Protocol Message Size Overflow
Priority MEDIUM 47CWE-190Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution, SQL injection
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-190, CWE-89 and the CVSS impact.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01716 77th percentileScored 2026-11-07
Fix Fixed npgsql (npgsql): 4.0.14, 4.1.13, 5.0.18 +3Npgsql (NuGet): 8.0.3, 4.0.14, 4.1.13 +3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| npgsql | npgsql | 4.0.0 to before 4.0.14; 4.1.0 to before 4.1.13; 5.0.0 to before 5.0.18; 6.0.0 to before 6.0.11; 7.0.0 to before 7.0.7; 8.0.0 to before 8.0.3 | 4.0.14, 4.1.13, 5.0.18, 6.0.11, 7.0.7, 8.0.3 | Patch available | CNA |
| — | Npgsql (NuGet) | 8.0.0 to before 8.0.3 | 8.0.3 | Patch available | GHSA-x9vc-6hfv-hg8c |
| — | Npgsql (NuGet) | before 4.0.14 | 4.0.14 | Patch available | GHSA-x9vc-6hfv-hg8c |
| — | Npgsql (NuGet) | 4.1.0 to before 4.1.13 | 4.1.13 | Patch available | GHSA-x9vc-6hfv-hg8c |
| — | Npgsql (NuGet) | 5.0.0 to before 5.0.18 | 5.0.18 | Patch available | GHSA-x9vc-6hfv-hg8c |
| — | Npgsql (NuGet) | 6.0.0 to before 6.0.11 | 6.0.11 | Patch available | GHSA-x9vc-6hfv-hg8c |
| — | Npgsql (NuGet) | 7.0.0 to before 7.0.7 | 7.0.7 | Patch available | GHSA-x9vc-6hfv-hg8c |
- npgsql Vendornpgsql Affected 4.0.0 to before 4.0.14; 4.1.0 to before 4.1.13; 5.0.0 to before 5.0.18; 6.0.0 to before 6.0.11; 7.0.0 to before 7.0.7; 8.0.0 to before 8.0.3 Fixed in 4.0.14, 4.1.13, 5.0.18, 6.0.11, 7.0.7, 8.0.3 Patch available CNA
- Npgsql (NuGet) Vendor— Affected 8.0.0 to before 8.0.3 Fixed in 8.0.3 Patch available GHSA-x9vc-6hfv-hg8c
- Npgsql (NuGet) Vendor— Affected before 4.0.14 Fixed in 4.0.14 Patch available GHSA-x9vc-6hfv-hg8c
- Npgsql (NuGet) Vendor— Affected 4.1.0 to before 4.1.13 Fixed in 4.1.13 Patch available GHSA-x9vc-6hfv-hg8c
- Npgsql (NuGet) Vendor— Affected 5.0.0 to before 5.0.18 Fixed in 5.0.18 Patch available GHSA-x9vc-6hfv-hg8c
- Npgsql (NuGet) Vendor— Affected 6.0.0 to before 6.0.11 Fixed in 6.0.11 Patch available GHSA-x9vc-6hfv-hg8c
- Npgsql (NuGet) Vendor— Affected 7.0.0 to before 7.0.7 Fixed in 7.0.7 Patch available GHSA-x9vc-6hfv-hg8c
CPE names CISA-ADP · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:npgsql:npgsql:4.0.0:*:*:*:*:*:*:* | 4.0.0 | — | npgsql |
| cpe:2.3:a:npgsql:npgsql:4.1.0:*:*:*:*:*:*:* | 4.1.0 | — | npgsql |
| cpe:2.3:a:npgsql:npgsql:5.0.0:*:*:*:*:*:*:* | 5.0.0 | — | npgsql |
| cpe:2.3:a:npgsql:npgsql:6.0.0:*:*:*:*:*:*:* | 6.0.0 | — | npgsql |
| cpe:2.3:a:npgsql:npgsql:7.0.0:*:*:*:*:*:*:* | 7.0.0 | — | npgsql |
| cpe:2.3:a:npgsql:npgsql:8.0.0:*:*:*:*:*:*:* | 8.0.0 | — | npgsql |
- cpe:2.3:a:npgsql:npgsql:4.0.0:*:*:*:*:*:*:* Versions 4.0.0 — ·npgsql
- cpe:2.3:a:npgsql:npgsql:4.1.0:*:*:*:*:*:*:* Versions 4.1.0 — ·npgsql
- cpe:2.3:a:npgsql:npgsql:5.0.0:*:*:*:*:*:*:* Versions 5.0.0 — ·npgsql
- cpe:2.3:a:npgsql:npgsql:6.0.0:*:*:*:*:*:*:* Versions 6.0.0 — ·npgsql
- cpe:2.3:a:npgsql:npgsql:7.0.0:*:*:*:*:*:*:* Versions 7.0.0 — ·npgsql
- cpe:2.3:a:npgsql:npgsql:8.0.0:*:*:*:*:*:*:* Versions 8.0.0 — ·npgsql
Remediation
- Fix · CNA npgsql (npgsql) Fixed in 4.0.14, 4.1.13, 5.0.18, 6.0.11, 7.0.7, 8.0.3
- Fix · GHSA-x9vc-6hfv-hg8c Npgsql (NuGet) Fixed in 8.0.3 Advisory →
- Fix · GHSA-x9vc-6hfv-hg8c Npgsql (NuGet) Fixed in 4.0.14 Advisory →
- Fix · GHSA-x9vc-6hfv-hg8c Npgsql (NuGet) Fixed in 4.1.13 Advisory →
- Fix · GHSA-x9vc-6hfv-hg8c Npgsql (NuGet) Fixed in 5.0.18 Advisory →
- Fix · GHSA-x9vc-6hfv-hg8c Npgsql (NuGet) Fixed in 6.0.11 Advisory →
- Fix · GHSA-x9vc-6hfv-hg8c Npgsql (NuGet) Fixed in 7.0.7 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-32655
- 2026-10-03 Alias added: GHSA-x9vc-6hfv-hg8c
References
Other 18
- https://github.com/npgsql/npgsql/security/advisories/GHSA-x9vc-6hfv-hg8c
- https://github.com/npgsql/npgsql/commit/091655eed0c84e502ab424950c930339d17c1928
- https://github.com/npgsql/npgsql/commit/3183efb2bdcca159c8c2e22af57e18ea8f853cf0
- https://github.com/npgsql/npgsql/commit/67acbe027e28477ac2199e15cfb554bb2ffaf169
- https://github.com/npgsql/npgsql/commit/703d9af8fa48dfe8c0180e36edb8278f34342d7b
- https://github.com/npgsql/npgsql/commit/a22a42d8141d7a3528f43c02c095a409507cf1af
- https://github.com/npgsql/npgsql/commit/e34e2ba8042e666d9af54a1b255fba4d5b11df56
- https://github.com/npgsql/npgsql/commit/f7e7ead0702d776a8f551f5786c4cac2d65c4bc6
- https://github.com/npgsql/npgsql/releases/tag/v4.0.14
- https://github.com/npgsql/npgsql/releases/tag/v4.1.13
- https://github.com/npgsql/npgsql/releases/tag/v5.0.18
- https://github.com/npgsql/npgsql/releases/tag/v6.0.11
- https://github.com/npgsql/npgsql/releases/tag/v7.0.7
- https://github.com/npgsql/npgsql/releases/tag/v8.0.3
- https://www.youtube.com/watch?v=Tfg1B8u1yvE
- https://github.com/npgsql/npgsql/files/14309397/npgsql-protocol-overflow-poc.zip
- https://github.com/npgsql/npgsql/files/14309386/Npgsql.Security.Advisory.pdf
- https://github.com/npgsql/npgsql
Sources
- CVE-2024-32655 · CVE Program
- CVE-2024-32655 · NVD
- FIRST EPSS
- GHSA-x9vc-6hfv-hg8c · GitHub Advisory Database · CC BY 4.0
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