CVE-2026-107313 pgjdbc stores bytes of earlier messages in place of a large value on GSS-encrypted connections
An attacker with access to the database can read sensitive data from previous messages due to buffer reuse in GSS-encrypted connections.
- 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-2026-107313?
CVE-2026-107313 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 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.
Weakness: CWE-201
Which versions are affected by CVE-2026-107313?
How do I fix CVE-2026-107313?
Upgrade to a fixed version.
Is CVE-2026-107313 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107313 exists.
Sources
Also known as DEBIAN-CVE-2026-107313, GHSA-hggc-j2qh-988m, UBUNTU-CVE-2026-107313.