CVE-2026-7210 is a hash-flooding denial-of-service vulnerability in
Python's XML parsing modules (xml.parsers.expat, xml.etree.ElementTree).
An attacker can craft XML input that forces O(n²) hash collisions in
libexpat's internal name dictionary, causing excessive CPU consumption.
The previous mitigation seeded libexpat's hash function with only 4
bytes of entropy, which is insufficient against a determined attacker.
This patch upgrades to XML_SetHashSalt16Bytes (libexpat >= 2.8.0),
providing a full 16-byte secret. Older expat versions fall back
gracefully to the legacy XML_SetHashSalt via a runtime NULL check.
Backport patch to fix CVE-2026-7210.
https://nvd.nist.gov/vuln/detail/CVE-2026-7210
Upstream fix:
24b8f12544
-- Changes from Upstream --
Replace compile-time version checks with runtime detection of the
XML_SetHashSalt16Bytes function using #pragma weak. This allows using
backported security fixes from expat even when version macros haven't
been bumped (in thus case expat 2.6.4 with CVE-2026-41080).
- Add weak symbol declaration for XML_SetHashSalt16Bytes
- Convert newxmlparseobject() version check to runtime NULL check
- Convert pyexpat_exec() CAPI export check to runtime NULL check
Tested with ptest:
Before: PASSED: 40019, FAILED: 0, SKIPPED: 1882
After: PASSED: 40020, FAILED: 0, SKIPPED: 1882
CVE: CVE-2026-7210
(From OE-Core rev: d753c46085c9d31f3b68d59f863855c909a6f400)
Signed-off-by: Amaury Couderc <amaury.couderc@est.tech>
Signed-off-by: Fabien Thomas <fabien.thomas@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>
bz2.BZ2Decompressor objects could be reused after a decompression error.
If an application caught the resulting OSError and retried with the same
decompressor, crafted input could cause the decompressor to resume from an
invalid internal state and perform out-of-bounds writes to a stack buffer.
This could crash the process when processing untrusted data.
This CVE has a CVSS 4.0 score of 8.2. The patch (5755d0f08394) is
referenced in the CVEList database.
(From OE-Core rev: 226831c16d13133e89d3405b5e2298bb6571bed6)
Signed-off-by: Benjamin Robin (Schneider Electric) <benjamin.robin@bootlin.com>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>
When using the "tarfile" module with a file opened in "streaming mode"
(mode="r|") the tarfile module did not properly handle EOF, making archive
parsing take exponentially longer.
(From OE-Core rev: 9c066bcd634e7b938a10c64ef1eaf322a99ec434)
Signed-off-by: Benjamin Robin (Schneider Electric) <benjamin.robin@bootlin.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit bbd9c82298880ab61b9befea97dfe8a0a4943836)
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>
tarfile.extractall() with the 'data' or 'tar' filter could be bypassed
by a crafted archive where a hardlink references a symlink stored at a
deeper name than the hardlink itself.
(From OE-Core rev: a76513212f1830fbda2dc6a243943a3c1a011239)
Signed-off-by: Benjamin Robin (Schneider Electric) <benjamin.robin@bootlin.com>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>
Makes the exclusion list a bit more readable, avoiding very long sed
expression lines.
[Kris Gavvala]:
this commit was modified to fit scarthgap. the original commit expects
to skip test_timerfd_TFD_TIMER_ABSTIME, test_date_locale2 and test_null_dlsym.
These tests were not being skipped on scarthgap so were removed from the
backport.
(From OE-Core rev: 649b6848ccd4aa3842b2b42b03058511e4f07ce3)
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Kris Gavvala <kris.gavvala@windriver.com>
(cherry picked from commit d9a44e7390d7c8f2c2b73572825a6f8ceeb729ac)
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>
