Server crash via negative Bind parameter length
Published Apr 7, 2026 · Updated Apr 7, 2026
Memory-safety flaw in Jack Christensen pgproto3 before 5.9.0 allows remote attackers to crash servers via a crafted Bind message. Bind.Decode accepts a signed parameter length below -1 because its bounds check compares the remaining nonnegative buffer size with the negative value, then uses that value as a Go slice bound. Exploitation requires an embedding server or proxy to pass attacker-controlled PostgreSQL wire traffic through Backend.Receive; one malformed message triggers a runtime panic that terminates the process.
Summary
What happened
Memory-safety flaw in Jack Christensen pgproto3 before 5.9.0 allows remote attackers to crash servers via a crafted Bind message. Bind.Decode accepts a signed parameter length below -1 because its bounds check compares the remaining nonnegative buffer size with the negative value, then uses that value as a Go slice bound. Exploitation requires an embedding server or proxy to pass attacker-controlled PostgreSQL wire traffic through Backend.Receive; one malformed message triggers a runtime panic that terminates the process.
The record
- CVE
- CVE-2026-33815
- Published
- Apr 7, 2026
- Updated
- Apr 7, 2026
- Vendor
- Jack Christensen
- Product
- pgproto3
- Classifications
- CWE-129, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 7, 2026CVE publishedPublication date reported by the CVE source.
- Apr 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- Negative Bind parameter length test caseproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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