Description
An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14. Due to a missing check when validating DNS responses, remote attackers might be able read the 16 bytes corresponding to an AAAA record from the non-initialized part of the buffer, possibly accessing anything that was left on the stack, or even past the end of the 8193-byte buffer, depending on the value of accepted_payload_size.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | haproxy | 1.8.15-1 | — |
| Debian 13 | haproxy | 1.8.15-1 | — |
| Debian 12 | haproxy | 1.8.15-1 | — |
| Debian 9 | haproxy | 1.7.5-2+deb9u1 | DLA-3034-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | haproxy | 1.8.8-1ubuntu0.3 | USN-3858-1 |
| Ubuntu 16.04 LTS | haproxy | 1.6.3-1ubuntu0.2 | USN-3858-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 3 | rh-haproxy18-haproxy +1 | 1.8.17-1.el7 | RHSA-2019:1436 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenShift 3 | atomic-enterprise-service-catalog +1 | 1:3.11.82-1.git.1673.133961e.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | atomic-openshift +12 | 3.11.82-1.git.0.08bc31b.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | atomic-openshift-cluster-autoscaler | 3.11.82-1.git.0.efb6af0.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | atomic-openshift-descheduler | 3.11.82-1.git.300.89765c9.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | atomic-openshift-dockerregistry | 3.11.82-1.git.452.0ce6383.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | atomic-openshift-metrics-server | 3.11.82-1.git.52.2fdca3f.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | atomic-openshift-node-problem-detector | 3.11.82-1.git.254.a448936.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | atomic-openshift-service-idler | 3.11.82-1.git.14.e353758.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | atomic-openshift-web-console | 3.11.82-1.git.355.5e8b1d9.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | golang-github-openshift-oauth-proxy | 3.11.82-1.git.425.7cac034.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | haproxy +1 | 1.8.17-3.el7 | RHSA-2019:0547, RHBA-2019:0326 |
| Red Hat OpenShift 3 | jenkins | 2.150.2.1549032159-1.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | jenkins-2-plugins | 3.11.1549642489-1.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | openshift-ansible +4 | 3.11.82-3.git.0.9718d0a.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | openshift-enterprise-autoheal | 3.11.82-1.git.219.0b5aff4.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | openshift-enterprise-cluster-capacity | 3.11.82-1.git.380.cf11c51.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | prometheus +1 | 3.11.82-1.git.5027.9d24833.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | prometheus-alertmanager +1 | 3.11.82-1.git.0.3bf41ce.el7 | RHBA-2019:0326 |
| Red Hat OpenShift 3 | prometheus-node-exporter +1 | 3.11.82-1.git.1063.48444e8.el7 | RHBA-2019:0326 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | haproxy | 1.8.15~git0.6b6a350a-3.6.2 | SUSE-SU-2019:0061-1 |
Advisories 6
- RHBA-2019:0326 Red Hat Bug Fix Advisory: OpenShift Container Platform 3.11 bug fix update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2019:1436 Red Hat Security Advisory: rh-haproxy18-haproxy security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:0547 Red Hat Security Advisory: OpenShift Container Platform 3.9 haproxy security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DLA-3034-1 haproxy - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3858-1 haproxy vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2019:0061-1 Security update for haproxy SUSE / openSUSE Security Updates · Feb 4, 2026
References
- http://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=efbbdf72992cd20458259962346044cafd9331c0
- USN-3858-1 vendor-advisory
- RHBA-2019:0326 vendor-advisory
- 106223 vdb-entry
- RHBA-2019:0327 vendor-advisory
- RHSA-2019:1436 vendor-advisory
- [debian-lts-announce] 20220530 [SECURITY] [DLA 3034-1] haproxy security update mailing-list