CVE-2016-4539

critical
Published 2016-05-22 ยท Modified 2026-05-06
CVSS v3
9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4 NEW
โ€”
not yet in upstream
VIR risk
9.8

Description

The xml_parse_into_struct function in ext/xml/xml.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 allows remote attackers to cause a denial of service (buffer under-read and segmentation fault) or possibly have unspecified other impact via crafted XML data in the second argument, leading to a parser level of zero.

Predictions

Exploit likelihood
97%
Patch ETA
โ€”

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or โ€” if you've already worked around this in production โ€” publish your fix to the community-verified tier.

โœš Propose a mitigation on Community โ†’ Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

fedora Fedora Affected 1 release
VersionStatusFixed in
24 Affected โ€”
suse SUSE Affected 2 releases
VersionStatusFixed in
42.1 Affected โ€”
โ€” Affected โ€”

Application impact

VendorProductVersionsFixed
php phpphp{"endIncluding":"5.5.34"}
php phpphp5.6.0
php phpphp5.6.1
php phpphp5.6.2
php phpphp5.6.3
php phpphp5.6.4
php phpphp5.6.5
php phpphp5.6.6
php phpphp5.6.7
php phpphp5.6.8
php phpphp5.6.9
php phpphp5.6.10
php phpphp5.6.11
php phpphp5.6.12
php phpphp5.6.13
php phpphp5.6.14
php phpphp5.6.15
php phpphp5.6.16
php phpphp5.6.17
php phpphp5.6.18
php phpphp5.6.19
php phpphp5.6.20
php phpphp7.0.0
php phpphp7.0.1
php phpphp7.0.2
php phpphp7.0.3
php phpphp7.0.4
php phpphp7.0.5

References

CWEs

CWE-119

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.