CVE-2026-42198High· 7.5▾ Twilightpgjdbc is an open source postgresql JDBC Driver. From version 42.2.0 to before version 42.7.11, pgjdbc is vulnerable to a client-side denial of service during SCRAM-SHA-256 authentication. A malicious server can instruct the driver to pe…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.7 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Jul 10.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.8%
0.8% → 3.3%
Last analysed / modified upstream
pgjdbc is an open source postgresql JDBC Driver. From version 42.2.0 to before version 42.7.11, pgjdbc is vulnerable to a client-side denial of service during SCRAM-SHA-256 authentication. A malicious server can instruct the driver to perform SCRAM authentication with a very large iteration count. With a large enough value, the client spends an unbounded amount of CPU time inside PBKDF2 before authentication can fail. A single attempt ties up a CPU core. Repeated or concurrent attempts exhaust client CPU and can wedge connection pools. In affected versions, loginTimeout did not fully mitigate this problem. When loginTimeout expired, the caller could stop waiting, but the worker thread performing the connection attempt could continue running and burning CPU inside the SCRAM PBKDF2 computation. This issue has been patched in version 42.7.11.
postgresql_jdbc_driver >= 42.2.0, < 42.7.11Upgrade past the affected range:
postgresql_jdbc_driver 42.7.11Connected by shared product, vendor, weakness, or advisory.
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