Description
url.cpp in libproxy through 0.4.15 is prone to a buffer overflow when PAC is enabled, as demonstrated by a large PAC file that is delivered without a Content-length header.
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 | libproxy | 0.4.15-15 | — |
| Debian 13 | libproxy | 0.4.15-15 | — |
| Debian 12 | libproxy | 0.4.15-15 | — |
| Debian 10 | libproxy | 0.4.15-5+deb10u1 | DSA-4800-1 |
| Debian 9 | libproxy | 0.4.14-2+deb9u2 | DLA-2450-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libproxy | 0.4.15-10ubuntu1.2 | USN-4673-1 |
| Ubuntu 18.04 LTS | libproxy | 0.4.15-1ubuntu0.2 | USN-4673-1 |
| Ubuntu 16.04 LTS | libproxy | 0.4.11-5ubuntu1.2 | USN-4673-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | libproxy +6 | 0.4.15-5.5.el8_10 | RHEA-2024:8852 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.8 EUS | libproxy +6 | 0.4.15-5.4.el8_8 | RHSA-2024:6205 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | libproxy +1 | 0.4.15-4.3.1 | SUSE-SU-2020:2901-1 |
| SLES 15 SP1 | libproxy +1 | 0.4.15-4.3.1 | SUSE-SU-2020:2901-1 |
| SLES 15 | libproxy +1 | 0.4.15-4.3.1 | SUSE-SU-2020:2901-1 |
| SLES 12 SP5 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SLES 12 SP4 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SLES 12 SP2 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SLES for SAP 15 | libproxy +1 | 0.4.15-4.3.1 | SUSE-SU-2020:2901-1 |
| SLES for SAP 12 SP5 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SLES for SAP 12 SP4 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SLES for SAP 12 SP3 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SLES for SAP 12 SP2 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SLE HPC 15 | libproxy +1 | 0.4.15-4.3.1 | SUSE-SU-2020:2901-1 |
| SUSE OpenStack Cloud Crowbar 9 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SUSE OpenStack Cloud Crowbar 8 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SUSE OpenStack Cloud 9 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SUSE OpenStack Cloud 8 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SUSE OpenStack Cloud 7 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SUSE HPE Helion OpenStack 8 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
| SUSE Enterprise Storage 5 | libproxy +1 | 0.4.13-18.3.1 | SUSE-SU-2020:2900-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libproxy | 0.4.17-2.2 | openSUSE-SU-2024:10973-1 |
| openSUSE Leap 15.2 | libproxy +1 | 0.4.15-lp152.5.3.1 | openSUSE-SU-2020:1680-1 |
| openSUSE Leap 15.1 | libproxy +1 | 0.4.15-lp151.4.3.1 | openSUSE-SU-2020:1676-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libproxy | 0.4.15-r9 | — |
| Alpine v3.23 | libproxy | 0.4.15-r9 | — |
| Alpine v3.22 | libproxy | 0.4.15-r9 | — |
| Alpine v3.21 | libproxy | 0.4.15-r9 | — |
| Alpine v3.20 | libproxy | 0.4.15-r9 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libproxy | 0.4.15-r9 | — |
| Alpine v3.18 | libproxy | 0.4.15-r9 | — |
| Alpine v3.17 | libproxy | 0.4.15-r9 | — |
| Alpine v3.16 | libproxy | 0.4.15-r9 | — |
| Alpine v3.15 | libproxy | 0.4.15-r9 | — |
| Alpine v3.14 | libproxy | 0.4.15-r9 | — |
| Alpine v3.13 | libproxy | 0.4.15-r9 | — |
| Alpine v3.12 | libproxy | 0.4.15-r8 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | libproxy | 0.4.17-5 | — |
Advisories 11
- RHEA-2024:8852 Red Hat Enhancement Advisory: libproxy bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2024:6205 Red Hat Security Advisory: libproxy security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- WID-SEC-2026-0778 Dell Secure Connect Gateway Policy Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 11, 2026
- USN-4673-1 libproxy vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4800-1 libproxy - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2450-1 libproxy - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:2901-1 Security update for libproxy SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1676-1 Security update for libproxy SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2900-1 Security update for libproxy SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10973-1 libproxy-devel-0.4.17-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1680-1 Security update for libproxy SUSE / openSUSE Security Updates · May 7, 2025
References
- https://github.com/libproxy/libproxy/pull/126
- https://bugs.debian.org/968366
- FEDORA-2020-15b775b07e vendor-advisory
- FEDORA-2020-941b563a80 vendor-advisory
- openSUSE-SU-2020:1676 vendor-advisory
- openSUSE-SU-2020:1680 vendor-advisory
- [debian-lts-announce] 20201113 [SECURITY] [DLA 2450-1] libproxy security update mailing-list
- DSA-4800 vendor-advisory