Issues

• isc_put_slice stores every second VARCHAR array element without character set conversion

  FirebirdSQL/firebird#9180 · Filter by author madorin opened on Oct 2, 2026
  1

• Incorrect filling of MON$COMPILED_STATEMENTS

  FirebirdSQL/firebird#9172 · Filter by author AlexBekhtin opened on Sep 29, 2026
  8

• Windows: no OS read-ahead for the engine's sequential page reads since 4.0 (FILE_FLAG_OVERLAPPED); with a cold cache gfix -v runs 3-9x and gbak 1.4-2.5x slower than on 3.0

  FirebirdSQL/firebird#9170 · Filter by author fdcastel opened on Sep 28, 2026
  2

• SuperServer: no attachment to ANY database can proceed while two or more attachments wait for a database under exclusive validation

  affect-version: 5.0 Initialtype: bug
  Bug

  FirebirdSQL/firebird#9169 · Filter by author fdcastel opened on Sep 28, 2026
  5

  

• FB 3.x hangs when user trace session, 'CREATE DATABASE' and 'fbsvcmgr info_svr_db_info' are used at the same time

  FirebirdSQL/firebird#9168 · Filter by author pavel-zotov opened on Sep 25, 2026

• It is impossible to read the value from the SEARCH_PATH context variable if it exceeds 255 characters.

  FirebirdSQL/firebird#9167 · Filter by author AlexBekhtin opened on Sep 25, 2026
  1

• Expression index on a computed column is not usable in other attachments and gets corrupted ("missing entries") when the table has a computed column calling a procedure that reads the same table

  FirebirdSQL/firebird#9165 · Filter by author tomaszdubiel18 opened on Sep 24, 2026
  6

• "Too many concurrent executions of the same request" raises when MaxStatementCacheSize > 0 and connection has lot of prepared statements.

  FirebirdSQL/firebird#9159 · Filter by author pavel-zotov opened on Sep 22, 2026
  1

• Incorrect result HASH SEMI JOIN with UUID key

  affect-version: 5.0.0affect-version: 5.0.1affect-version: 5.0.2affect-version: 5.0.3affect-version: 5.0.4fix-version: 5.0.5type: bug
  Bug

  FirebirdSQL/firebird#9158 · Filter by author sim1984 opened on Sep 19, 2026
  4

  

• ISQL 'set per_table' may produce unreal data in the table statistics if some counter became greater than 2^31

  FirebirdSQL/firebird#9150 · Filter by author pavel-zotov opened on Sep 12, 2026

• Killing a blocked ALTER ... RESTART WITH can leave a primary key index allowing duplicate values

  FirebirdSQL/firebird#9149 · Filter by author LouisCaous opened on Sep 9, 2026
  2

• Names of LOCAL and DECLARED temporary tables that participate in queries can not be easy matched between EXPLAINED PLAN and TRACE table statistics

  type: improvement
  FirebirdSQL/firebird#9147 · Filter by author pavel-zotov opened on Sep 9, 2026
  1

• Add Restart=on-failure in systemd units firebird and firebird-superserver

  affect-version: 3.0.14affect-version: 4.0.7affect-version: 5.0.4affect-version: 6.0 Initialfix-version: 6.0 Alpha 1qa: cannot be tested
  FirebirdSQL/firebird#9141 · Filter by author basid-irk opened on Sep 1, 2026
  5

  

• Event connection listener remains in LISTEN and blocks subsequent event connections

  FirebirdSQL/firebird#9140 · Filter by author jhhenriquee opened on Aug 28, 2026

• Deadlock in Classic Server with self-security database and ON CONNECT trigger that access some MON$ table(s) is possible

  affect-version: 5.0.4type: bug
  Bug

  FirebirdSQL/firebird#9136 · Filter by author hvlad opened on Aug 27, 2026
  1

  

• The ability to declare exceptions in a package

  FirebirdSQL/firebird#9133 · Filter by author AlexBekhtin opened on Aug 27, 2026
  1

• An other OuterJoinConversion performance/plan issue

  FirebirdSQL/firebird#9129 · Filter by author EPluribusUnum opened on Aug 19, 2026
  1

• Make autoregistration ChaCha64 as preffered WireCrypt plugin

  FirebirdSQL/firebird#9128 · Filter by author basid-irk opened on Aug 18, 2026
  2

• unknown ISC error in ESoE between different major Firebird versions

  FirebirdSQL/firebird#9127 · Filter by author basid-irk opened on Aug 18, 2026

• SecurityDatabase configuration hardening

  FirebirdSQL/firebird#9126 · Filter by author basid-irk opened on Aug 18, 2026
  3

• bug(cmake): makeHeader target references deleted file src/misc/makeHeader.cpp - breaks musl/Alpine builds

  FirebirdSQL/firebird#9122 · Filter by author satwareAG-ironMike opened on Aug 8, 2026

• Regression in 4.x and 5.x. DB-LEVEL triggers can not be created just after CREATE DATABASE, RE-connect is reruired

  FirebirdSQL/firebird#9113 · Filter by author pavel-zotov opened on Aug 5, 2026

• Add the SQLDA_CURRENT_VERSION macro definition to the sqlda_pub.h file.

  FirebirdSQL/firebird#9109 · Filter by author dmitry-v-orekhov opened on Jul 30, 2026
  13

• UDR: EXTERNAL NAME module qualifier ignored on Linux when two modules register a routine of the same name — first-loaded module wins (5.0.3 and 5.0.4)

  FirebirdSQL/firebird#9105 · Filter by author ov-soft opened on Jul 24, 2026
  8

  

• Firebird 6.0. Table statistics are not displayed correctly in isql for DLTT

  FirebirdSQL/firebird#9103 · Filter by author sim1984 opened on Jul 23, 2026