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Vulnerability record · CVE-2019-12529 · published 11 July 2019

CVE-2019-12529: Squid-cache squid out-of-bounds read vulnerability

Squid Cache · Squid

An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.

5.9 CVSS 3.1 Medium EPSS 8.1% · top 5.4% CWE-125 · Out-of-bounds read
5.9CVSS 3.1 base score, v2 4.3
8.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
24References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html Mailing ListThird Party Advisory
http://www.squid-cache.org/Versions/v4/changesets/ Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-dd46b5417809647f561d8a5e0e74c3aacd235258.patch PatchVendor Advisory
https://github.com/squid-cache/squid/commits/v4 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVL
https://seclists.org/bugtraq/2019/Aug/42 Mailing ListThird Party Advisory
https://usn.ubuntu.com/4065-1/ Third Party Advisory
https://usn.ubuntu.com/4065-2/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4507 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html Mailing ListThird Party Advisory
http://www.squid-cache.org/Versions/v4/changesets/ Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-dd46b5417809647f561d8a5e0e74c3aacd235258.patch PatchVendor Advisory
https://github.com/squid-cache/squid/commits/v4 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVL
https://seclists.org/bugtraq/2019/Aug/42 Mailing ListThird Party Advisory
https://usn.ubuntu.com/4065-1/ Third Party Advisory
https://usn.ubuntu.com/4065-2/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4507 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-12529), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.