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In Expat (aka libexpat) before 2.4.3 a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g. allocating too few bytes or only freeing memory).

🗓️ 13 Jan 2022 08:00:00Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 6 Views

Expat before 2.4.3 has realloc misbehavior in storeAtts from a 29 or more left shift in xmlparse.c.

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Vulners
Node
OR
microsoftcbl2_expat_2.4.3-1Range<2.4.3-1
microsoftcm1_expat_2.4.3-1Range<2.4.3-1

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13 Jan 2022 08:00Current
7.5High risk
Vulners AI Score7.5
CVSS 3.18.8
CVSS 29
EPSS0.04234
SSVC
expatstore attributes bugleft shift issuexmlparse bug
6