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[wrynose,02/40] expat: set CVE_STATUS for CVE-2026-72522

Message ID f76844064efd49938292c39d3b0203c23b8d6d31.1788629392.git.yoann.congal@smile.fr
State RFC, archived
Delegated to: Yoann Congal
Headers show
Series [wrynose,01/40] apt: mark CVE-2011-3374 as fixed-version | expand

Commit Message

Yoann Congal Sept. 5, 2026, 8:44 p.m. UTC 
From: Jaipaul Cheernam <jaipaul.cheernam@est.tech>

CVE-2026-72522 is an out-of-bounds read and infinite loop vulnerability in
Expat's *_toUtf16 functions caused by mis-classifying low surrogates as
high surrogates.

Our Yocto configuration is not affected by this vulnerability:
- Expat is compiled with EXPAT_CHAR_TYPE=char (8-bit character representation).
- Neither XML_UNICODE nor XML_UNICODE_WCHAR_T is defined.
- The vulnerable *_toUtf16 functions are only invoked when Expat's internal
  character type is 16-bit (ushort or wchar_t).
- In 8-bit mode, Expat handles conversion using *_toUtf8 functions even when
  parsing UTF-16 encoded XML inputs, rendering the vulnerable code path
  unreachable.

Reference:
[1] https://nvd.nist.gov/vuln/detail/CVE-2026-72522
[2] https://github.com/libexpat/libexpat/pull/1296/changes/8fbfb52fa88e040e8b0b7a9d39f260d6a9e8b6db

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
[YC: EXPAT_CHAR_TYPE=char is the default and we do not change it]
---
 meta/recipes-core/expat/expat_2.7.5.bb | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/meta/recipes-core/expat/expat_2.7.5.bb b/meta/recipes-core/expat/expat_2.7.5.bb
index 890ee5b7d34..da35b8f9ff5 100644
--- a/meta/recipes-core/expat/expat_2.7.5.bb
+++ b/meta/recipes-core/expat/expat_2.7.5.bb
@@ -57,3 +57,6 @@  do_install_ptest:class-target() {
 BBCLASSEXTEND += "native nativesdk"
 
 CVE_PRODUCT = "expat libexpat"
+
+CVE_STATUS[CVE-2026-72522] = "not-applicable-config: Needs Expat compiled with 16bit character support , Issue only affects firefox/Windows. \
+EXPAT_CHAR_TYPE:STRING=char is for Yocto builds"