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    CVE-2008-5557

    Heap-based buffer overflow in ext/mbstring/libmbfl/filters/mbfilter_htmlent.c in the mbstring extension in PHP 4.3.0 through 5.2.6 allows context-dependent attackers to execute arbitrary code via a crafted string containing an HTML entity, which is not properly handled during Unicode conversion, related to the (1) mb_convert_encoding, (2) mb_check_encoding, (3) mb_convert_variables, and (4) mb_parse_str functions.

    Published:Aug 5, 2008
    Last Modified:Apr 23, 2026
    EPS:Dec 23, 2008
    EPSS Score:0.29698
    CVSS Score:10

    Affected Products

    Vendor
    Php
    Product
    Php
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    http://bugs.php.net/bug.php?id=45722http://cvs.php.net/viewvc.cgi/php-src/ext/mbstring/libmbfl/filters/mbfilter_htmlent.c?r1=1.7&r2=1.8http://bugs.php.net/bug.php?id=45722http://cvs.php.net/viewvc.cgi/php-src/ext/mbstring/libmbfl/filters/mbfilter_htmlent.c?r1=1.7&r2=1.8

    Related CVEs

    CVE-2026-14355 (CVSS 5.6) — In PHP versions 8.2.* before 8.2.32, 8.3.* before 8.3.32, 8.4.* before 8.4.23, 8.5.* before 8.5.8, the AES-WRA…
    CVE-2026-7263 (CVSS 6.3) — In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, DOMNode::C14N() method may process the XML data in…
    CVE-2026-6104 (CVSS 6.3) — In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, when an encoding name containing an embedded NUL b…
    CVE-2026-7258 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some fu…
    CVE-2026-6722 (CVSS 9.5) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the SOA…
    CVE-2026-7259 (CVSS 2.1) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a misma…
    CVE-2026-7261 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, when So…
    CVE-2026-7262 (CVSS 2.9) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, when a …
    CVE-2025-14179 (CVSS 7.4) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the PDO…
    CVE-2026-7568 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the met…

    References

    http://archives.neohapsis.com/archives/fulldisclosure/2008-12/0477.html
    http://bugs.php.net/bug.php?id=45722
    http://cvs.php.net/viewvc.cgi/php-src/ext/mbstring/libmbfl/filters/mbfilter_htmlent.c?r1=1.7&r2=1.8
    http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02029444
    http://lists.apple.com/archives/security-announce/2009/May/msg00002.html
    http://lists.opensuse.org/opensuse-security-announce/2009-02/msg00002.html
    http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html
    http://marc.info/?l=bugtraq&m=124654546101607&w=2
    http://marc.info/?l=bugtraq&m=125631037611762&w=2
    http://secunia.com/advisories/34642
    http://secunia.com/advisories/35003
    http://secunia.com/advisories/35074
    http://secunia.com/advisories/35306
    http://secunia.com/advisories/35650
    http://securitytracker.com/id?1021482
    http://support.apple.com/kb/HT3549
    http://wiki.rpath.com/Advisories:rPSA-2009-0035
    http://www.debian.org/security/2009/dsa-1789
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:045
    http://www.php.net/ChangeLog-5.php#5.2.7
    http://www.redhat.com/support/errata/RHSA-2009-0350.html
    http://www.securityfocus.com/archive/1/501376/100/0/threaded
    http://www.securityfocus.com/bid/32948
    http://www.us-cert.gov/cas/techalerts/TA09-133A.html
    http://www.vupen.com/english/advisories/2009/1297
    https://exchange.xforce.ibmcloud.com/vulnerabilities/47525
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10286
    https://www.redhat.com/archives/fedora-package-announce/2009-May/msg01451.html
    https://www.redhat.com/archives/fedora-package-announce/2009-May/msg01465.html
    http://archives.neohapsis.com/archives/fulldisclosure/2008-12/0477.html
    http://bugs.php.net/bug.php?id=45722
    http://cvs.php.net/viewvc.cgi/php-src/ext/mbstring/libmbfl/filters/mbfilter_htmlent.c?r1=1.7&r2=1.8
    http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02029444
    http://lists.apple.com/archives/security-announce/2009/May/msg00002.html
    http://lists.opensuse.org/opensuse-security-announce/2009-02/msg00002.html
    http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html
    http://marc.info/?l=bugtraq&m=124654546101607&w=2
    http://marc.info/?l=bugtraq&m=125631037611762&w=2
    http://secunia.com/advisories/34642
    http://secunia.com/advisories/35003
    http://secunia.com/advisories/35074
    http://secunia.com/advisories/35306
    http://secunia.com/advisories/35650
    http://securitytracker.com/id?1021482
    http://support.apple.com/kb/HT3549
    http://wiki.rpath.com/Advisories:rPSA-2009-0035
    http://www.debian.org/security/2009/dsa-1789
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:045
    http://www.php.net/ChangeLog-5.php#5.2.7
    http://www.redhat.com/support/errata/RHSA-2009-0350.html
    http://www.securityfocus.com/archive/1/501376/100/0/threaded
    http://www.securityfocus.com/bid/32948
    http://www.us-cert.gov/cas/techalerts/TA09-133A.html
    http://www.vupen.com/english/advisories/2009/1297
    https://exchange.xforce.ibmcloud.com/vulnerabilities/47525
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10286
    https://www.redhat.com/archives/fedora-package-announce/2009-May/msg01451.html
    https://www.redhat.com/archives/fedora-package-announce/2009-May/msg01465.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High