Debian released four security advisories on July 23 and 24, 2026, targeting serious vulnerabilities in pdns-recursor, webkit2gtk, squid, and wordpress. The pdns-recursor update closes two specific flaws that could enable cache poisoning or bypass DNSSEC validation checks. WebKitGTK received over thirty fixes for bugs that allowed arbitrary JavaScript execution, sandbox escapes, clipboard hijacking, memory corruption, and silent data leaks when browsers processed malicious web pages.

[DSA 6397-1] pdns-recursor security update
[DSA 6398-1] webkit2gtk security update
[DLA 4697-1] squid security update
[DSA 6399-1] wordpress security update
ELA-1782-1 squid security update

[SECURITY] [DSA 6397-1] pdns-recursor security update

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Debian Security Advisory DSA-6397-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
July 23, 2026 https://www.debian.org/security/faq
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Package : pdns-recursor
CVE ID : CVE-2026-52686 CVE-2026-52688

Multiple vulnerabilities have been discovered in PDNS Recursor, a
resolving name server, which could result in cache poisoning or DNSSEC
validation bypass.

For the stable distribution (trixie), these problems have been fixed in
version 5.2.12-0+deb13u1.

We recommend that you upgrade your pdns-recursor packages.

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

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 6398-1] webkit2gtk security update

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Debian Security Advisory DSA-6398-1 security@debian.org
https://www.debian.org/security/ Alberto Garcia
July 23, 2026 https://www.debian.org/security/faq
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Package : webkit2gtk
CVE ID : CVE-2024-4367 CVE-2026-28847 CVE-2026-28883 CVE-2026-28901
CVE-2026-28902 CVE-2026-28903 CVE-2026-28904 CVE-2026-28905
CVE-2026-28907 CVE-2026-28942 CVE-2026-28946 CVE-2026-28947
CVE-2026-28953 CVE-2026-28955 CVE-2026-28958 CVE-2026-39872
CVE-2026-43658 CVE-2026-43660 CVE-2026-43663 CVE-2026-43676
CVE-2026-43699 CVE-2026-43701 CVE-2026-43705 CVE-2026-43707
CVE-2026-43712 CVE-2026-43713 CVE-2026-43715 CVE-2026-43716
CVE-2026-43720 CVE-2026-43721 CVE-2026-43725 CVE-2026-43726
CVE-2026-43727 CVE-2026-43731 CVE-2026-43732 CVE-2026-43734
CVE-2026-43740 CVE-2026-43742 CVE-2026-43745

The following vulnerabilities have been discovered in the WebKitGTK
web engine:

CVE-2024-4367

Thomas Rinsma discovered that a type check was missing when
handling fonts in PDF.js, which would allow arbitrary JavaScript
execution in the PDF.js context.

CVE-2026-28847

DARKNAVY, an anonymous researcher and Daniel Rhea discovered that
processing maliciously crafted web content may lead to an
unexpected process crash.

CVE-2026-28883

Kwak Kiyong discovered that processing maliciously crafted web
content may lead to an unexpected process crash.

CVE-2026-28901

Joshua Rogers, Luigino Camastra, Igor Morgenstern, Guido Vranken,
Maher Azzouzi and Ngan Nguyen discovered that processing
maliciously crafted web content may lead to an unexpected process
crash.

CVE-2026-28902

Tristan Madani and Nathaniel Oh discovered that processing
maliciously crafted web content may lead to an unexpected process
crash.

CVE-2026-28903

Mateusz Krzywicki discovered that processing maliciously crafted
web content may lead to an unexpected process crash.

CVE-2026-28904

Luka Racki discovered that processing maliciously crafted web
content may lead to an unexpected process crash.

CVE-2026-28905

Yuhao Hu, Yuanming Lai, Chenggang Wu, and Zhe Wang discovered that
processing maliciously crafted web content may lead to an
unexpected process crash.

CVE-2026-28907

Cantina discovered that processing maliciously crafted web content
may prevent Content Security Policy from being enforced.

CVE-2026-28942

Milad Nasr and Nicholas Carlini discovered that processing
maliciously crafted web content may lead to an unexpected Safari
crash.

CVE-2026-28946

Gia Bui, dr3dd, and w0wbox discovered that processing maliciously
crafted web content may lead to an unexpected Safari crash.

CVE-2026-28947

dr3dd discovered that processing maliciously crafted web content
may lead to an unexpected Safari crash.

CVE-2026-28953

Maher Azzouzi discovered that processing maliciously crafted web
content may lead to an unexpected process crash.

CVE-2026-28955

wac and Kookhwan Lee discovered that processing maliciously
crafted web content may lead to an unexpected process crash.

CVE-2026-28958

Cantina discovered that an app may be able to access sensitive
user data.

CVE-2026-39872

Utkarsh Pal and Ignacio Sanmillan discovered that processing
maliciously crafted web content may lead to an unexpected process
crash.

CVE-2026-43658

Do Young Park discovered that processing maliciously crafted web
content may lead to an unexpected Safari crash.

CVE-2026-43660

Cantina discovered that processing maliciously crafted web content
may prevent Content Security Policy from being enforced.

CVE-2026-43663

Soyeon Park, Amy Burnett, Khai Tran, sherkito, Kota Toda,
HexRabbit, NiNi, Tristan Madani and Brian Carpenter discovered
that processing maliciously crafted web content may lead to an
unexpected process crash.

CVE-2026-43676

Mateusz Krzywicki, dr3dd, and Tommy DeVoss discovered that
processing maliciously crafted web content may lead to an
unexpected process crash.

CVE-2026-43699

Tommy DeVoss discovered that processing maliciously crafted web
content may lead to an unexpected process crash.

CVE-2026-43701

Aaron Grattafiori discovered that a malicious website may be able
to process restricted web content outside the sandbox.

CVE-2026-43705

dr3dd discovered that processing maliciously crafted web content
may lead to memory corruption.

CVE-2026-43707

Amy Burnett discovered that processing maliciously crafted web
content may lead to an unexpected process crash.

CVE-2026-43712

Kwak Kiyong, Song Nuri, and Tristan Madani discovered that
processing maliciously crafted web content may lead to an
unexpected process crash.

CVE-2026-43713

Jody Ritonga discovered that visiting a website may leak sensitive
data.

CVE-2026-43715

Milad Nasr and Nicholas Carlini discovered that processing
maliciously crafted web content may lead to memory corruption.

CVE-2026-43716

Tuan, Duc, Amy Burnett and Evan Lambert discovered that processing
maliciously crafted web content may lead to an unexpected process
crash.

CVE-2026-43720

Gia Bui and Josef Korbel discovered that processing maliciously
crafted web content may lead to an unexpected process crash.

CVE-2026-43721

Idan Masas discovered that a malicious website may be able to
silently hijack clipboard data.

CVE-2026-43725

Luke Francis discovered that a malicious website may be able to
process restricted web content outside the sandbox.

CVE-2026-43726

Josef Korbel, Tristan Madani, Gia Bui and Narendra Singh
discovered that processing maliciously crafted web content may
lead to an unexpected process crash.

CVE-2026-43727

Tommy DeVoss, Gia Bui and Gurpreet Shergill discovered that
processing maliciously crafted web content may lead to an
unexpected process crash.

CVE-2026-43731

dr3dd discovered that processing maliciously crafted web content
may lead to memory corruption.

CVE-2026-43732

Nan Wang discovered that processing maliciously crafted web
content may disclose sensitive user information.

CVE-2026-43734

Jonathan Alush-Aben discovered that processing maliciously crafted
web content may lead to an unexpected process crash.

CVE-2026-43740

Nathaniel Oh and Arni Hardarson discovered that processing
maliciously crafted web content may result in the disclosure of
process memory.

CVE-2026-43742

Yulia Mertsalova discovered that processing maliciously crafted
web content may lead to an unexpected process crash.

CVE-2026-43745

Amy Burnett and Khai Tran discovered that processing maliciously
crafted web content may lead to an unexpected process crash.

For the stable distribution (trixie), these problems have been fixed in
version 2.52.5-1~deb13u1.

We recommend that you upgrade your webkit2gtk packages.

For the detailed security status of webkit2gtk please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/webkit2gtk

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] [DLA 4697-1] squid security update

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Debian LTS Advisory DLA-4697-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Utkarsh Gupta
July 24, 2026 https://wiki.debian.org/LTS
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Package : squid
Version : 4.13-10+deb11u7 5.7-2+deb12u6
CVE ID : CVE-2026-33515 CVE-2026-33526 CVE-2026-47729
CVE-2026-50012

Multiple security issues were discovered in the Squid proxy caching
server, which could result in information disclosure or denial of
service.

For Debian 11 bullseye, these problems have been fixed in version
4.13-10+deb11u7.

For Debian 12 bookworm, these problems have been fixed in version
5.7-2+deb12u6.

We recommend that you upgrade your squid packages.

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

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

[SECURITY] [DSA 6399-1] wordpress security update

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Debian Security Advisory DSA-6399-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
July 23, 2026 https://www.debian.org/security/faq
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Package : wordpress
CVE ID : CVE-2026-60137
Debian Bug : 1142510

It was discovered that wordpress, a web blogging tool, was prone to a
SQL injection vulnerability.

For the stable distribution (trixie), this problem has been fixed in
version 6.8.6+dfsg1-0+deb13u1.

We recommend that you upgrade your wordpress packages.

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

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-1782-1 squid security update (by )

Package : squid

Version : 4.13-10+deb11u7~deb10u1 (buster)

Related CVEs :
CVE-2026-33515
CVE-2026-33526
CVE-2026-47729
CVE-2026-50012

Multiple security issues were discovered in the Squid proxy caching
server, which could result in information disclosure or denial of
service.

ELA-1782-1 squid security update (by )