Debian released security advisories regarding critical flaws found within both the tiff library and Firefox ESR browser software. The first update patches a heap overflow vulnerability that could lead to denial of service or code execution, while the second addresses multiple issues with similar severe consequences for users. Separate Debian GNU/Linux ELTS updates also exist for older PostgreSQL versions to resolve memory disclosure bugs and arbitrary code execution risks in database extensions. System administrators are strongly advised to apply these package upgrades immediately to secure their infrastructure against potential exploitation.

[DSA 6303-1] tiff security update
[DSA 6202-1] firefox-esr security update
ELA-1676-1 postgresql-11 security update
ELA-1677-1 postgresql-9.6 security update

[SECURITY] [DSA 6303-1] tiff security update

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Debian Security Advisory DSA-6203-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
April 08, 2026 https://www.debian.org/security/faq
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Package : tiff
CVE ID : CVE-2026-4775

Quang Luong discovered a heap overflow in the libtiff library, which may
result in denial of service or the execution of arbitrary code if
malformed image files are processed.

For the oldstable distribution (bookworm), this problem has been fixed
in version 4.5.0-6+deb12u4.

For the stable distribution (trixie), this problem has been fixed in
version 4.7.0-3+deb13u2.

We recommend that you upgrade your tiff packages.

For the detailed security status of tiff please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/tiff

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

[SECURITY] [DSA 6202-1] firefox-esr security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-6202-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
April 08, 2026 https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2026-5731 CVE-2026-5732 CVE-2026-5734

Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code.

For the oldstable distribution (bookworm), these problems have been fixed
in version 140.9.1esr-1~deb12u1.

For the stable distribution (trixie), these problems have been fixed in
version 140.9.1esr-1~deb13u1.

We recommend that you upgrade your firefox-esr packages.

For the detailed security status of firefox-esr please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/firefox-esr

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

ELA-1676-1 postgresql-11 security update

Package : postgresql-11
Version : 11.22-0+deb10u7 (buster)

Related CVEs :
CVE-2026-2003
CVE-2026-2004
CVE-2026-2005
CVE-2026-2006

Multiple vulnerabilities were fixed in PostgreSQL, a popular database.

CVE-2026-2003

Improper validation of type “oidvector” in PostgreSQL
allows a database user to disclose a few bytes of server memory. We have
not ruled out viability of attacks that arrange for presence of
confidential information in disclosed bytes, but they seem unlikely.

CVE-2026-2004

Missing validation of type of input in PostgreSQL
intarray extension selectivity estimator function allows an object creator
to execute arbitrary code as the operating system user running the
database.

CVE-2026-2005

Heap buffer overflow in PostgreSQL pgcrypto allows a
ciphertext provider to execute arbitrary code as the operating system user
running the database.

CVE-2026-2006

Missing validation of multibyte character length in
PostgreSQL text manipulation allows a database user to issue crafted
queries that achieve a buffer overrun. That suffices to execute arbitrary
code as the operating system user running the database.

ELA-1676-1 postgresql-11 security update

ELA-1677-1 postgresql-9.6 security update

Package : postgresql-9.6

Version : 9.6.24-0+deb9u11 (stretch)

Related CVEs :
CVE-2026-2003
CVE-2026-2004
CVE-2026-2005
CVE-2026-2006

Multiple vulnerabilities were fixed in PostgreSQL, a popular database.

CVE-2026-2003

Improper validation of type “oidvector” in PostgreSQL
allows a database user to disclose a few bytes of server memory. We have
not ruled out viability of attacks that arrange for presence of
confidential information in disclosed bytes, but they seem unlikely.

CVE-2026-2004

Missing validation of type of input in PostgreSQL
intarray extension selectivity estimator function allows an object creator
to execute arbitrary code as the operating system user running the
database.

CVE-2026-2005

Heap buffer overflow in PostgreSQL pgcrypto allows a
ciphertext provider to execute arbitrary code as the operating system user
running the database.

CVE-2026-2006

Missing validation of multibyte character length in
PostgreSQL text manipulation allows a database user to issue crafted
queries that achieve a buffer overrun. That suffices to execute arbitrary
code as the operating system user running the database.

ELA-1677-1 postgresql-9.6 security update