What is CVE-2019-11039?

CVE-2019-11039 is a critical-severity vulnerability in PHP, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2019-06-19.

How severe is CVE-2019-11039?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2019-11039 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Out-of-bounds Read in PHP

CVE-2019-11039

Function iconv_mime_decode_headers() in PHP versions 7.1.x below 7.1.30, 7.2.x below 7.2.19 and 7.3.x below 7.3.6 may perform out-of-buffer read due to integer overflow when parsing MIME headers. This may lead to information disclosure or crash.

Vulnerability class: Buffer Overflow

Published 2019-06-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.031 (87.7th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000

Affected products

PHP
PHP Group — versions 7.1.30, 7.2.19, 7.3.6
Debian Linux — versions 9.0, 10.0
openSUSE Leap — versions 15.0, 15.1
Red Hat Software Collections — versions 1.0

Weakness classification (CWE)

Public proof-of-concept exploits

behouba/log6302A

References

bugs.php.net/bug.php (Exploit, Patch, Vendor Advisory)
lists.opensuse.org/opensuse-security-announce/2019-07/msg00029.html (vendor-advisory, Mailing List, Third Party Advisory)
access.redhat.com/errata/RHSA-2019:2519 (vendor-advisory, Third Party Advisory)
seclists.org/bugtraq/2019/Sep/35 (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2019/dsa-4527 (vendor-advisory, Third Party Advisory)
www.debian.org/security/2019/dsa-4529 (vendor-advisory, Third Party Advisory)
seclists.org/bugtraq/2019/Sep/38 (mailing-list, Mailing List, Third Party Advisory)
access.redhat.com/errata/RHSA-2019:3299 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2019-11039?: CVE-2019-11039 is a critical-severity vulnerability in PHP, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2019-06-19.
How severe is CVE-2019-11039?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2019-11039 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.