postgresql-17 (17.10-0ubuntu0.25.10.1) questing; urgency=medium

  A dump/restore is not required for those running 17.X.

  However, if you are upgrading from a version earlier than 17.6, see
  those release notes as well please.

  Prevent unbounded recursion while processing startup packets

  A malicious client could crash the connected backend by alternating
  rejected SSL and GSS encryption requests indefinitely. (CVE-2026-6479)

  Fix assorted integer overflows in memory-allocation calculations

  Various places were incautious about the possibility of integer overflow
  in calculations of how much memory to allocate. Overflow would lead to
  allocating a too-small buffer which the caller would then write past the
  end of. This would at least trigger server crashes, and probably could
  be exploited for arbitrary code execution. In many but by no means all
  cases, the hazard exists only in 32-bit builds. (CVE-2026-6473)

  Properly quote subscription names in pg_createsubscriber

  The given subscription name was inserted into SQL commands without
  quoting, so that SQL injection could be achieved in the (perhaps
  unlikely) case that the subscription name comes from an untrusted
  source. (CVE-2026-6476)

  Properly quote object names in logical replication origin checks

  ALTER SUBSCRIPTION ... REFRESH PUBLICATION interpolated schema and
  relation names into SQL commands without quoting them, allowing
  execution of arbitrary SQL on the publisher. (CVE-2026-6638)

  Reject over-length options in ts_headline()

  The StartSel, StopSel and FragmentDelimiter strings must not exceed 32Kb
  in length, but this was not checked for. An over-length value would
  typically crash the server. (CVE-2026-6473)

  Guard against malicious time zone names in timeofday() and pg_strftime()

  A crafted time zone setting could pass % sequences to snprintf(),
  potentially causing crashes or disclosure of server memory. Another path
  to similar results was to overflow the limited-size output buffer used
  by pg_strftime().  (CVE-2026-6474)

  When creating a multirange type, ensure the user has CREATE privilege on
  the schema specified for the multirange type

  The multirange type can be put into a different schema than its parent
  range type, but we neglected to apply the required privilege check when
  doing so.  (CVE-2026-6472)

  Use timing-safe string comparisons in authentication code

  Use timingsafe_bcmp() instead of memcpy() or strcmp() when checking
  passwords, hashes, etc. It is not known whether the data dependency of
  those functions is usefully exploitable in any of these places, but in
  the interests of safety, replace them. (CVE-2026-6478)

  Mark PQfn() as unsafe, and avoid using it within libpq

  For a non-integral result type, PQfn() is not passed the size of the
  output buffer, so it cannot check that the data returned by the server
  will fit. A malicious server could therefore overwrite client memory.
  This is unfixable without an API change, so mark the function as
  deprecated. Internally to libpq, use a variant version that can apply
  the missing check. (CVE-2026-6477)

  Prevent path traversal in pg_basebackup and pg_rewind

  These applications failed to validate output file paths read from their
  input, so that a malicious source could overwrite any file writable by
  these applications. Constrain where data can be written by rejecting
  paths that are absolute or contain parent-directory references.
  (CVE-2026-6475)

  Guard against field overflow within contrib/intarray's query_int type
  and contrib/ltree's ltxtquery type

  Parsing of these query structures did not check for overflow of 16-bit
  fields, so that construction of an invalid query tree was possible. This
  can crash the server when executing the query. (CVE-2026-6473)

  Guard against overly long values of contrib/ltree's lquery type

  Values with more than 64K items caused internal overflows, potentially
  resulting in stack smashes or wrong answers. (CVE-2026-6473)

  Prevent SQL injection and buffer overruns in contrib/spi

  check_foreign_key() was insufficiently careful about quoting key values,
  and also used fixed-length buffers for constructing queries. While this
  module is only meant as example code, it still shouldn't contain such
  dangerous errors.  (CVE-2026-6637)

  Details about these and many further changes can be found at:
  https://www.postgresql.org/docs/17/release-17-10.html.

 -- Athos Ribeiro <athos@ubuntu.com>  Fri, 15 May 2026 07:43:54 -0300

postgresql-17 (17.9-0ubuntu0.25.10.1) questing; urgency=medium

  This release encompasses changes from upstream's 17.8 and 17.9
  releases. The former contains fixes for 4 CVEs (among other things), and
  the latter was a hotfix for regressions introcuced in 17.8.

  A dump/restore is not required for those running 17.X.

  However, if you are upgrading from a version earlier than 17.6, see
  those release notes as well please.

  Guard against unexpected dimensions of oidvector/int2vector (Tom Lane)

  These data types are expected to be 1-dimensional arrays containing no
  nulls, but there are cast pathways that permit violating those
  expectations. Add checks to some functions that were depending on those
  expectations without verifying them, and could misbehave in consequence.
  (CVE-2026-2003)

  Harden selectivity estimators against being attached to operators that
  accept unexpected data types (Tom Lane)

  contrib/intarray contained a selectivity estimation function that could
  be abused for arbitrary code execution, because it did not check that
  its input was of the expected data type. Third-party extensions should
  check for similar hazards and add defenses using the technique intarray
  now uses. Since such extension fixes will take time, we now require
  superuser privilege to attach a non-built-in selectivity estimator to an
  operator. (CVE-2026-2004)

  Fix buffer overrun in contrib/pgcrypto's PGP decryption functions
  (Michael Paquier)

  Decrypting a crafted message with an overlength session key caused a
  buffer overrun, with consequences as bad as arbitrary code execution.
  (CVE-2026-2005)

  Fix inadequate validation of multibyte character lengths (Thomas Munro,
  Noah Misch)

  Assorted bugs allowed an attacker able to issue crafted SQL to overrun
  string buffers, with consequences as bad as arbitrary code execution.
  After these fixes, applications may observe “invalid byte sequence for
  encoding” errors when string functions process invalid text that has
  been stored in the database. (CVE-2026-2006)

  Details about these and many further changes can be found at:
  https://www.postgresql.org/docs/17/release-17-8.html and
  https://www.postgresql.org/docs/17/release-17-9.html.

 -- Athos Ribeiro <athos@ubuntu.com>  Thu, 26 Feb 2026 11:52:46 -0300

postgresql-17 (17.7-0ubuntu0.25.10.1) questing; urgency=medium

  A dump/restore is not required for those running 17.X.

  However, if you are upgrading from a version earlier than 17.6, see
  those release notes as well please.

  Check for CREATE privileges on the schema in CREATE STATISTICS (Jelte
  Fennema-Nio)

  This omission allowed table owners to create statistics in any schema,
  potentially leading to unexpected naming conflicts. (CVE-2025-12817)

  Avoid integer overflow in allocation-size calculations within libpq
  (Jacob Champion)

  Several places in libpq were not sufficiently careful about computing
  the required size of a memory allocation. Sufficiently large inputs
  could cause integer overflow, resulting in an undersized buffer, which
  would then lead to writing past the end of the buffer. (CVE-2025-12818)

  Details about these and many further changes can be found at:
  https://www.postgresql.org/docs/17/release-17-7.html.

 -- Athos Ribeiro <athos@ubuntu.com>  Wed, 19 Nov 2025 10:52:18 -0300
