Skip to content
Fencer Vulns
medium 5.9

CVE-2018-11386 json

Symfony DoS

published 2018-06-13 8 y ago modified 2026-06-17 4 mo ago also GHSA-r2rq-3h56-fqm4 , EUVD-2022-5068

cvss
5.9
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

An issue was discovered in the HttpFoundation component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11. The PDOSessionHandler class allows storing sessions on a PDO connection. Under some configurations and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources.

Patch / fix

  • packagist symfony/symfony 2.7.48, 2.8.41, 3.3.17, 3.4.11, 4.0.11
  • packagist symfony/http-foundation 2.7.48, 2.8.41, 3.3.17, 3.4.11, 4.0.11
  • sensiolabs symfony 2.7.48, 2.8.41, 3.3.17, 3.4.11, 4.0.11
  • symfony Debian 14, Debian 13, Debian 12 3.4.12+dfsg-1

debian advisories DEBIAN-CVE-2018-11386

  • symfony Ubuntu 18.04 LTS 3.4.6+dfsg-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2018-11386

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-11386 updated

php-symfony: Multiple flaws

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.58% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
GitHub 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
packagist symfony/symfony
>=2.7.0, <2.7.48
>=2.8.0, <2.8.41
>=3.3.0, <3.3.17
>=3.4.0, <3.4.11
>=4.0.0, <4.0.11
2.7.48
2.8.41
3.3.17
3.4.11
4.0.11
packagist symfony/http-foundation
>=2.7.0, <2.7.48
>=2.8.0, <2.8.41
>=3.3.0, <3.3.17
>=3.4.0, <3.4.11
>=4.0.0, <4.0.11
2.7.48
2.8.41
3.3.17
3.4.11
4.0.11

Classification

Weakness
  • CWE-613 DEPRECATED: Insufficient Session Expiration

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.