SUSE alert openSUSE-SU-2026:0188-1 (tor)

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openSUSE-SU-2026:0188-1: moderate: Security update for tor
Date:
             
 
Fri, 05 Jun 2026 18:05:16 +0200
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<20260605160516.D8797FCE7@maintenance.suse.de>
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Article

   openSUSE Security Update: Security update for tor
______________________________________________________________________________

Announcement ID:    openSUSE-SU-2026:0188-1
Rating:             moderate
References:         
Affected Products:
                    openSUSE Backports SLE-15-SP7
______________________________________________________________________________

   An update that contains security fixes can now be installed.

Description:

   This update for tor fixes the following issues:

   - Update to 0.4.9.9
     * Major bugfixes (compression, security):
       - Fix a compression bomb bypass where an attacker could concatenate
         many gzip or zlib sub-streams, each just under the per-stream
         detection threshold, to avoid the compression bomb check entirely.
         TROVE-2026-022. Fixes bug 41275; bugfix on 0.3.1.1-alpha.
       - Fix an infinite loop when decompressing a truncated zlib/gzip stream
         with done=1. A truncated stream never reaches Z_STREAM_END, causing
         zlib to return Z_BUF_ERROR with no input remaining, which
         buf_add_compress() mistook for a full output buffer and retried
         forever. Fixed by returning TOR_COMPRESS_ERROR in that case so the
         caller can abort cleanly. TROVE-2026-021. Fixes bug 41274; bugfix
         on 0.2.6.1-alpha.
     * Major bugfixes (conflux, security):
       - Fix a NULL write after free when sending a CONFLUX_SWITCH cell
         fails. The return value of relay_send_command_from_edge() was
         ignored, so a send failure (which calls circuit_mark_for_close() and
         removes the leg via cfx_del_leg()) would go undetected, causing the
         caller to write to the now-freed current leg and resulting in a
         crash. TROVE-2026-017. Fixes bug 41263; bugfix
         on 0.4.8.1-alpha.
     * Major bugfixes (security, TROVE-2026-019):
       - Avoid out-of-bounds read/write when parsing a consensus or detached
         signature with unexpected signature digest type. Impact is minor for
         most Tor roles, but potentially major for directory authorities.
         Fixes bug 41267; bugfix on 0.2.8.2-alpha.
     * Major bugfixes (client stability, TROVE-2026-013, TROVE-2026-015):
       - Protect against a client-side assert that can happen if a malicious
         onion service gets the client to load its carefully crafted onion
         descriptor. Fixes bugs 41259 and 41261; bugfix
         on 0.3.1.1-alpha.
     * Major bugfixes (code safety):
       - Avoid a dangerous situation in router_find_exact_exit_enclave()
         where we could have reached an assert if bridges or relays claim an
         IP address of 0.0.0.0. Fixes bug 41276; bugfix on 0.4.5.1-alpha.
     * Major bugfixes (conflux, shutdown):
       - Fix a use-after-free in the shutdown path when freeing conflux
         circuits. cfx_add_leg() shares stream list pointers across legs
         without NULLing the old leg, so circuit_free_all() would free the
         lists via one leg and then access freed memory via another. TROVE-
         2026-016. Fixes bug 41262; bugfix on 0.4.8.1-alpha.
     * Major bugfixes (DNSPort, TROVE-2026-018):
       - Fix a client-side crash that would happen if we decide to stop
         reading on a RESOLVE request that came from the DNSPort or
         controller. This crash could happen naturally under heavy load and
         with poor luck, but since 0.4.7.2-alpha it could be induced by the
         exit relay via a flow control request. Fixes bug 41265; bugfix
         on 0.2.0.1-alpha.
     * Major bugfixes (memory safety, TROVE-2026-014):
       - Avoid a heap-use-after-free mistake that can happen in the conflux
         subsystem, and which can be induced at either the client or the exit
         relay. Fixes bug 41260; bugfix on 0.4.8.1-alpha.
     * Major bugfixes (onion services, TROVE-2026-020):
       - Avoid a possible divide by zero crash on onion services that have
         the proof-of-work (PoW) defense enabled. This bug could be hit by
         extreme bad luck or maybe by the help of an attacker crafting just
         the right circumstances. Fixes bug 41270; bugfix on 0.4.8.1-alpha.


Patch Instructions:

   To install this openSUSE Security Update use the SUSE recommended installation methods
   like YaST online_update or "zypper patch".

   Alternatively you can run the command listed for your product:

   - openSUSE Backports SLE-15-SP7:

      zypper in -t patch openSUSE-2026-188=1



Package List:

   - openSUSE Backports SLE-15-SP7 (aarch64 ppc64le s390x x86_64):

      tor-0.4.9.9-bp157.2.12.1


References: