Bug 2521288 - CVE-2026-77640 tor: Tor: Denial of Service via truncated zlib/gzip stream decompression [epel-all]
Summary: CVE-2026-77640 tor: Tor: Denial of Service via truncated zlib/gzip stream dec...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora EPEL
Classification: Fedora
Component: tor
Version: epel10
Hardware: Unspecified
OS: Unspecified
low
low
Target Milestone: ---
Assignee: Marcel Haerry
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["ee9ac655-d010-4845-93b2-f...
Depends On:
Blocks: CVE-2026-77640
TreeView+ depends on / blocked
 
Reported: 2026-08-22 11:47 UTC by Vladimir Vasilev
Modified: 2026-10-17 01:21 UTC (History)
4 users (show)

Fixed In Version: tor-0.4.9.14-1.el9 tor-0.4.9.14-1.el10_4
Clone Of:
Environment:
Last Closed: 2026-10-17 00:41:34 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Vladimir Vasilev 2026-08-22 11:47:54 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

tor before 0.4.9.9 was prone to 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. This is TROVE-2026-021.

Comment 1 Fedora Update System 2026-10-08 13:48:16 UTC
FEDORA-EPEL-2026-2cce141a86 (tor-0.4.9.14-1.el9) has been submitted as an update to Fedora EPEL 9.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-2cce141a86

Comment 2 Fedora Update System 2026-10-08 13:48:26 UTC
FEDORA-EPEL-2026-4032d817f5 (tor-0.4.9.14-1.el10_4) has been submitted as an update to Fedora EPEL 10.4.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-4032d817f5

Comment 3 Fedora Update System 2026-10-09 02:26:28 UTC
FEDORA-EPEL-2026-2cce141a86 has been pushed to the Fedora EPEL 9 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-2cce141a86

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-10-09 02:33:04 UTC
FEDORA-EPEL-2026-4032d817f5 has been pushed to the Fedora EPEL 10.4 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-4032d817f5

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-10-17 00:41:34 UTC
FEDORA-EPEL-2026-2cce141a86 (tor-0.4.9.14-1.el9) has been pushed to the Fedora EPEL 9 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-10-17 01:21:31 UTC
FEDORA-EPEL-2026-4032d817f5 (tor-0.4.9.14-1.el10_4) has been pushed to the Fedora EPEL 10.4 stable repository.
If problem still persists, please make note of it in this bug report.


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