Summary
The skopeo command lets you inspect images from container image registries, get images and image layers, and use signatures to create and verify files.
Security Fix(es):
* net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)
* encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)
* net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)
* net/[http:](http:) golang: Go net/[http:](http:) Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)
* html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)
* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 2
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 10 | skopeo | 2:1.22.2-5.el10_2 |
| AlmaLinux · 10 | skopeo-tests | 2:1.22.2-5.el10_2 |
Vulnerabilities 6
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High 7.5
Enforce maximum recursion depth in encoding/asn1
Enforce a recursion limit in Unmarshal to prevent stack exhaustion when parsing deeply-nested, recursive structures.
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High 7.5
Quadratic string concatenation in consumePhrase in net/mail
Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.
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High 7.5
Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http
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.
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High 7.5
Limit handshake messages we are willing to accept post-handshake in crypto/tls
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 to keep performing key deriva…
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Medium 6.1
Fix Javascript regexp context tracking in html/template
Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.
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Medium 5.9
Avoid quadratic complexity in resolvePath in net/url
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 resolution operates on a byte…
References
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report
https://access.redhat.com/security/cve/CVE-2026-33818
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report
https://access.redhat.com/security/cve/CVE-2026-42499
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report
https://access.redhat.com/security/cve/CVE-2026-56853
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report
https://access.redhat.com/security/cve/CVE-2026-56858
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report
https://access.redhat.com/security/cve/CVE-2026-56860
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report
https://access.redhat.com/security/cve/CVE-2026-56862
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report
https://bugzilla.redhat.com/2467809
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report
https://bugzilla.redhat.com/2515815
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report
https://bugzilla.redhat.com/2515820
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report
https://bugzilla.redhat.com/2515827
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report
https://bugzilla.redhat.com/2515838
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report
https://bugzilla.redhat.com/2515839
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advisory
https://errata.almalinux.org/10/ALSA-2026-64818.html