CVE-2015-5523

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2015-08-11 · updated 2026-06-17
Weakness: CWE-119

Description

The ParseValue function in lexer.c in tidy before 4.9.31 allows remote attackers to cause a denial of service (crash) via vectors involving multiple whitespace characters before an empty href, which triggers a large memory allocation.

Affected products

Apple Iphone Os: through 8.2
macOS: through 10.6.8
Apple watchOS: through 1.0.1
Canonical Ubuntu Linux: 12.04, 14.04, 15.04
Debian Linux: 7.0, 8.0
HTACG tidy-html5: through 4.9.30

References

http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html
http://lists.apple.com/archives/security-announce/2015/Sep/msg00005.html
http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
http://www.debian.org/security/2015/dsa-3309
http://www.openwall.com/lists/oss-security/2015/06/04/2
http://www.openwall.com/lists/oss-security/2015/07/13/7
http://www.openwall.com/lists/oss-security/2015/07/15/3
http://www.securityfocus.com/bid/75037
http://www.securitytracker.com/id/1033703
http://www.ubuntu.com/usn/USN-2695-1
https://github.com/htacg/tidy-html5/issues/217#issuecomment-108565501
https://support.apple.com/HT205212

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