pgjdbc stores bytes of earlier messages in place of a large value on GSS-encrypted connections

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107313
StatePUBLISHED
AssignerPostgreSQL
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-07 19:17:35 UTC
Updated2026-10-07 21:17:15 UTC
Descriptionpgjdbc, the PostgreSQL JDBC Driver, versions 42.7.4 and 42.7.5 can send the previous contents of the GSS send buffer in place of the first part of a value on a connection with GSS encryption (gssEncMode=prefer or require), and the server stores the value without an error. The buffer is 16320 bytes with MIT Kerberos. The stored value then holds bytes of the messages the driver sent just before it on the same connection, such as the statement's SQL text, its other parameters, and earlier rows of the same batch, instead of the bytes the application supplied. Values at least as long as the buffer are affected when the driver writes them from a byte array: bind parameters set with setString, setBytes, or a ByteStreamWriter, CopyIn.writeToCopy, and LargeObject.write. Most such writes fail with an ArrayIndexOutOfBoundsException instead. The default, gssEncMode=allow, does not start GSS encryption, and connections without GSS encryption are not affected. Versions 42.7.3 and earlier are not affected, and 42.7.6 fixes the problem.

Risk And Classification

Primary CVSS: v3.1 4.2 MEDIUM from f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Problem Types: CWE-201 | CWE-201 CWE-201 Insertion of Sensitive Information Into Sent Data

VersionSourceTypeScoreSeverityVector
3.1f86ef6dc-4d3a-42ad-8f28-e6d5547a5007Secondary4.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
3.1CNADECLARED4.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pgjdbc Pgjdbc affected 42.7.4 42.7.6 maven Not specified

References

ReferenceSourceLinkTags
github.com/pgjdbc/pgjdbc/commit/96f6862bb6bcadde7620688c7bce73f2d01a7ebb f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 github.com
github.com/pgjdbc/pgjdbc/security/advisories/GHSA-hggc-j2qh-988m 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/pgjdbc/pgjdbc/pull/3500 f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Vladimir Sitnikov (en)

Additional Advisory Data

Solutions

CNA: Upgrade to pgjdbc 42.7.6 or later.

Workarounds

CNA: On 42.7.4 and 42.7.5, turn GSS encryption off with gssEncMode=disable and use TLS for transport encryption instead.

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