Medium 4.3Published Aug 11, 2015

CVE-2015-5523The 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…

Updated under an hour ago (Nov 2, 2026, 12:10 AM ET)

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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.

CVSS: 4.3 MEDIUM (v2.0, NVD)AV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness (CWE): CWE-119
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

canonical ubuntu_linux canonical:ubuntu_linux	12.04; 14.04; 15.04	NVD
debian debian_linux debian:debian_linux	7.0; 8.0	NVD
apple iphone_os apple:iphone_os	through 8.2	NVD
apple mac_os_x apple:mac_os_x	through 10.6.8	NVD
apple watchos apple:watchos	through 1.0.1	NVD
htacg tidy htacg:tidy	through 4.9.30	NVD

References

References

http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html	mailing-list, third-party-advisory
http://lists.apple.com/archives/security-announce/2015/Sep/msg00005.html	mailing-list, third-party-advisory
http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html	mailing-list, third-party-advisory
http://www.debian.org/security/2015/dsa-3309	third-party-advisory
http://www.openwall.com/lists/oss-security/2015/06/04/2	exploit
http://www.openwall.com/lists/oss-security/2015/07/13/7	exploit
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	third-party-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.