CVE-2026-107315 pgjdbc pads a value shorter than its declared length with bytes of earlier statements (rather than zeros)
An attacker can read sensitive data from previous database statements if an application incorrectly declares parameter lengths, leaking information via buffer padding.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-107315?
CVE-2026-107315 is a medium-severity vulnerability in pgjdbc, published on 7 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
pgjdbc, the PostgreSQL JDBC Driver, versions 42.7.4 through 42.7.13 pads a value that is shorter than its declared length with bytes left in its send buffer instead of zeros, and the server stores those bytes as part of the value. The bytes are messages the driver sent earlier on the same connection: SQL text and parameter values of recent statements, which on a pooled connection can come from other requests. Each padded value can carry up to 8192 bytes of this traffic, or 16320 bytes on a connection with GSS encryption. The padding happens when an application declares a length larger than the data it supplies, through PreparedStatement.setObject with a ByteStreamWriter, CopyIn.writeToCopy, PGCopyOutputStream.write, LargeObject.write, or Blob.setBytes. The driver accepts these calls without an error. An attacker who can make the application store such a value and read it back can collect earlier traffic. Applications whose declared lengths always match their data are not affected. Versions 42.7.3 and earlier pad with zeros.
Which versions are affected by CVE-2026-107315?
How do I fix CVE-2026-107315?
Upgrade to a fixed version.
Is CVE-2026-107315 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107315 exists.
Sources
Also known as CLEANSTART-2026-SM93271, DEBIAN-CVE-2026-107315, GHSA-f64h-wr5q-3qf3, UBUNTU-CVE-2026-107315.