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CVE-2026-56864

Medium priority
Needs evaluation

A malicious GOSUMDB was capable of serving arbitrary module content not contained within the transparency log. This attack allows for a coordinating GOPROXY and GOSUMDB to serve a client malicious module content that cannot be...

16 affected packages

golang, golang-1.6, golang-1.8, golang-1.9, golang-1.10...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang Not in release Not in release Not in release — —
golang-1.6 Not in release Not in release Not in release — —
golang-1.8 Not in release Not in release Not in release — Needs evaluation
golang-1.9 Not in release Not in release Not in release — Needs evaluation
golang-1.10 Not in release Not in release Not in release — Needs evaluation
golang-1.13 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.14 Not in release Not in release Not in release Needs evaluation —
golang-1.16 Not in release Not in release Not in release Needs evaluation Needs evaluation
golang-1.17 Not in release Not in release Needs evaluation — —
golang-1.18 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.20 Not in release Not in release Needs evaluation Needs evaluation —
golang-1.21 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.22 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.23 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.24 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.25 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-56862

Medium priority

Some fixes available 3 of 35

Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server...

16 affected packages

golang, golang-1.6, golang-1.8, golang-1.9, golang-1.10...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang Not in release Not in release Not in release — —
golang-1.6 Not in release Not in release Not in release — —
golang-1.8 Not in release Not in release Not in release — Needs evaluation
golang-1.9 Not in release Not in release Not in release — Needs evaluation
golang-1.10 Not in release Not in release Not in release — Needs evaluation
golang-1.13 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.14 Not in release Not in release Not in release Needs evaluation —
golang-1.16 Not in release Not in release Not in release Needs evaluation Needs evaluation
golang-1.17 Not in release Not in release Needs evaluation — —
golang-1.18 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.20 Not in release Not in release Needs evaluation Needs evaluation —
golang-1.21 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.22 Not in release Fixed Fixed Fixed —
golang-1.23 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.24 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.25 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-56860

Medium priority
Needs evaluation

Previously, resolving relative paths containing parent directory ('..') segments performed string conversions and buffer rewrites on each step, resulting in quadratic time complexity and high memory allocation overhead. Now, path...

16 affected packages

golang, golang-1.6, golang-1.8, golang-1.9, golang-1.10...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang Not in release Not in release Not in release — —
golang-1.6 Not in release Not in release Not in release — —
golang-1.8 Not in release Not in release Not in release — Needs evaluation
golang-1.9 Not in release Not in release Not in release — Needs evaluation
golang-1.10 Not in release Not in release Not in release — Needs evaluation
golang-1.13 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.14 Not in release Not in release Not in release Needs evaluation —
golang-1.16 Not in release Not in release Not in release Needs evaluation Needs evaluation
golang-1.17 Not in release Not in release Needs evaluation — —
golang-1.18 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.20 Not in release Not in release Needs evaluation Needs evaluation —
golang-1.21 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.22 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.23 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.24 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.25 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-56859

Medium priority

Some fixes available 3 of 35

Previously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack exhaustion.

16 affected packages

golang, golang-1.6, golang-1.8, golang-1.9, golang-1.10...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang Not in release Not in release Not in release — —
golang-1.6 Not in release Not in release Not in release — —
golang-1.8 Not in release Not in release Not in release — Needs evaluation
golang-1.9 Not in release Not in release Not in release — Needs evaluation
golang-1.10 Not in release Not in release Not in release — Needs evaluation
golang-1.13 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.14 Not in release Not in release Not in release Needs evaluation —
golang-1.16 Not in release Not in release Not in release Needs evaluation Needs evaluation
golang-1.17 Not in release Not in release Needs evaluation — —
golang-1.18 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.20 Not in release Not in release Needs evaluation Needs evaluation —
golang-1.21 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.22 Not in release Fixed Fixed Fixed —
golang-1.23 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.24 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.25 Needs evaluation Needs evaluation Needs evaluation — —
Show all 16 packages Show less packages

CVE-2026-56858

Medium priority
Needs evaluation

Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.

16 affected packages

golang, golang-1.6, golang-1.8, golang-1.9, golang-1.10...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang Not in release Not in release Not in release — —
golang-1.6 Not in release Not in release Not in release — —
golang-1.8 Not in release Not in release Not in release — Needs evaluation
golang-1.9 Not in release Not in release Not in release — Needs evaluation
golang-1.10 Not in release Not in release Not in release — Needs evaluation
golang-1.13 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.14 Not in release Not in release Not in release Needs evaluation —
golang-1.16 Not in release Not in release Not in release Needs evaluation Needs evaluation
golang-1.17 Not in release Not in release Needs evaluation — —
golang-1.18 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.20 Not in release Not in release Needs evaluation Needs evaluation —
golang-1.21 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.22 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.23 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.24 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.25 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-56853

Medium priority
Needs evaluation

When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.

16 affected packages

golang, golang-1.6, golang-1.8, golang-1.9, golang-1.10...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang Not in release Not in release Not in release — —
golang-1.6 Not in release Not in release Not in release — —
golang-1.8 Not in release Not in release Not in release — Needs evaluation
golang-1.9 Not in release Not in release Not in release — Needs evaluation
golang-1.10 Not in release Not in release Not in release — Needs evaluation
golang-1.13 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.14 Not in release Not in release Not in release Needs evaluation —
golang-1.16 Not in release Not in release Not in release Needs evaluation Needs evaluation
golang-1.17 Not in release Not in release Needs evaluation — —
golang-1.18 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.20 Not in release Not in release Needs evaluation Needs evaluation —
golang-1.21 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.22 Not in release Not affected Not affected Not affected —
golang-1.23 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.24 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.25 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-33818

Medium priority

Some fixes available 3 of 35

Enforce a recursion limit in Unmarshal to prevent stack exhaustion when parsing deeply-nested, recursive structures.

16 affected packages

golang, golang-1.6, golang-1.8, golang-1.9, golang-1.10...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang Not in release Not in release Not in release — —
golang-1.6 Not in release Not in release Not in release — —
golang-1.8 Not in release Not in release Not in release — Needs evaluation
golang-1.9 Not in release Not in release Not in release — Needs evaluation
golang-1.10 Not in release Not in release Not in release — Needs evaluation
golang-1.13 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.14 Not in release Not in release Not in release Needs evaluation —
golang-1.16 Not in release Not in release Not in release Needs evaluation Needs evaluation
golang-1.17 Not in release Not in release Needs evaluation — —
golang-1.18 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.20 Not in release Not in release Needs evaluation Needs evaluation —
golang-1.21 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.22 Not in release Fixed Fixed Fixed —
golang-1.23 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.24 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.25 Needs evaluation Needs evaluation Needs evaluation — —
Show all 16 packages Show less packages

CVE-2026-42505

Medium priority
Needs evaluation

Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.

16 affected packages

golang, golang-1.6, golang-1.8, golang-1.9, golang-1.10...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang Not in release Not in release Not in release — —
golang-1.6 Not in release Not in release Not in release — —
golang-1.8 Not in release Not in release Not in release — Needs evaluation
golang-1.9 Not in release Not in release Not in release — Needs evaluation
golang-1.10 Not in release Not in release Not in release — Needs evaluation
golang-1.13 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.14 Not in release Not in release Not in release Needs evaluation —
golang-1.16 Not in release Not in release Not in release Needs evaluation Needs evaluation
golang-1.17 Not in release Not in release Needs evaluation — —
golang-1.18 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.20 Not in release Not in release Needs evaluation Needs evaluation —
golang-1.21 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.22 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.23 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.24 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.25 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-39822

Medium priority
Vulnerable

On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root when the final path component of the a path is a symbolic link and the path ends in /. For example, 'root.Open("symlink/")'...

16 affected packages

golang, golang-1.6, golang-1.8, golang-1.9, golang-1.10...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang Not in release Not in release Not in release — —
golang-1.6 Not in release Not in release Not in release — —
golang-1.8 Not in release Not in release Not in release — Needs evaluation
golang-1.9 Not in release Not in release Not in release — Needs evaluation
golang-1.10 Not in release Not in release Not in release — Needs evaluation
golang-1.13 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.14 Not in release Not in release Not in release Needs evaluation —
golang-1.16 Not in release Not in release Not in release Needs evaluation Needs evaluation
golang-1.17 Not in release Not in release Needs evaluation — —
golang-1.18 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.20 Not in release Not in release Needs evaluation Needs evaluation —
golang-1.21 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.22 Not in release Needs evaluation Needs evaluation Needs evaluation —
golang-1.23 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.24 Needs evaluation Needs evaluation Needs evaluation — —
golang-1.25 Vulnerable Needs evaluation Needs evaluation — —
Show all 16 packages Show less packages

CVE-2026-39821

High priority

Some fixes available 9 of 76

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather than an error. This...

27 affected packages

golang-golang-x-net, google-guest-agent, google-osconfig-agent, containerd, golang-golang-x-net-dev...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang-golang-x-net Vulnerable Vulnerable Fixed Not in release Not in release
google-guest-agent Needs evaluation Needs evaluation Fixed Needs evaluation Needs evaluation
google-osconfig-agent Needs evaluation Needs evaluation Fixed Needs evaluation Needs evaluation
containerd Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
golang-golang-x-net-dev Not in release Not in release Not in release Fixed Fixed
adsys Needs evaluation Needs evaluation Needs evaluation Needs evaluation —
juju-core — — — — —
lxd — — — Needs evaluation Needs evaluation
golang Not in release Not in release Not in release Not in release Not in release
golang-1.6 Not in release Not in release Not in release Not in release Not in release
golang-1.8 Not in release Not in release Not in release Not in release Needs evaluation
golang-1.9 Not in release Not in release Not in release Not in release Needs evaluation
golang-1.10 Not in release Not in release Not in release Not in release Needs evaluation
golang-1.13 Not in release Not in release Needs evaluation Needs evaluation Needs evaluation
golang-1.14 Not in release Not in release Not in release Needs evaluation Not in release
golang-1.16 Not in release Not in release Not in release Needs evaluation Needs evaluation
golang-1.17 Not in release Not in release Needs evaluation Not in release Not in release
golang-1.18 Not in release Not in release Fixed Needs evaluation Needs evaluation
golang-1.19 Not in release Not in release Not in release Not in release Not in release
golang-1.20 Not in release Not in release Needs evaluation Needs evaluation Not in release
golang-1.21 Not in release Needs evaluation Fixed Needs evaluation Not in release
golang-1.22 Not in release Needs evaluation Needs evaluation Needs evaluation Not in release
golang-1.23 Needs evaluation Needs evaluation Fixed Not in release Not in release
golang-1.24 Needs evaluation Needs evaluation Fixed Not in release Not in release
golang-1.25 Needs evaluation Needs evaluation Needs evaluation Not in release Not in release
golang-1.26 Needs evaluation Needs evaluation Needs evaluation Not in release Not in release
golang-1.27 Not in release Not in release Not in release Not in release Not in release
Show all 27 packages Show less packages