Description
Heap-based buffer overflow in the px_pac_reload function in lib/pac.c in libproxy 0.2.x and 0.3.x allows remote servers to have an unspecified impact via a crafted Content-Length size in an HTTP response header for a proxy.pac file request, a different vulnerability than CVE-2012-4504.
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 | 0.3.1-5.1 | — |
| Debian 13 | libproxy | 0.3.1-5.1 | — |
| Debian 12 | libproxy | 0.3.1-5.1 | — |
| Debian 6.0 | libproxy | 0.3.1-2+squeeze1 | DSA-2571-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | libproxy +7 | 0.3.0-3.el6_3 | RHSA-2012:1461 |
Advisories 2
- RHSA-2012:1461 Red Hat Security Advisory: libproxy security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2571-1 libproxy - buffer overflow Debian Security (DSA / DLA) · Mar 9, 2026
References
- openSUSE-SU-2012:1375 vendor-advisory
- 51048 third-party-advisory
- RHSA-2012:1461 vendor-advisory
- https://groups.google.com/forum/?fromgroups=#%21topic/libproxy/VxZ8No7mT0E
- USN-1629-1 vendor-advisory
- [oss-security] 20121012 libproxy PAC downloading buffer overflows mailing-list
- [oss-security] 20121012 Re: libproxy PAC downloading buffer overflows mailing-list
- DSA-2571 vendor-advisory
- 51180 third-party-advisory
- 51308 third-party-advisory
- 55910 vdb-entry
- [oss-security] 20121016 Re: libproxy PAC downloading buffer overflows mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=864612