Linux · 
Red Hat · Security advisory · September 13, 2026
Red Hat · Security advisory · September 13, 2026RHSA-2026:65886: image-builder security update
RHSA-2026:65886, released September 13, 2026, fixes 13 CVEs in image-builder (version 0:52.1-1.el9_8.2). None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
13
1 rated Critical
Exploited
0
None reported
Highest CVSS
10.0
Base score, 0 to 10
Highest EPSS
0.0183
79th percentile
Priority of the 13 CVEs
Patch now 0
Urgent 1
High 12
Routine 0
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| image-builder | RHEL 9 | 0:52.1-1.el9_8.2 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-39821 | Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna | 10.0 | 0.0183 | None reported |
| High | CVE-2026-33811 | Crash when handling long CNAME response in net | 8.8 | 0.0088 | None reported |
| High | CVE-2026-42499 | Quadratic string concatenation in consumePhrase in net/mail | 8.8 | 0.0080 | None reported |
| High | CVE-2026-39820 | Quadratic string concatentation in consumeComment in net/mail | 8.8 | 0.0078 | None reported |
| High | CVE-2026-32280 | Unexpected work during chain building in crypto/x509 | 9.1 | 0.0063 | None reported |
| High | CVE-2026-33818 | Enforce maximum recursion depth in encoding/asn1 | 8.8 | 0.0057 | None reported |
| High | CVE-2026-56853 | Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http | 8.8 | 0.0057 | None reported |
| High | CVE-2026-56859 | Add recursion depth guard during decode in encoding/xml | 8.8 | 0.0057 | None reported |
| High | CVE-2026-56862 | Limit handshake messages we are willing to accept post-handshake in crypto/tls | 8.8 | 0.0057 | None reported |
| High | CVE-2026-42504 | Quadratic complexity in WordDecoder.DecodeHeader in mime | 8.8 | 0.0056 | None reported |
| High | CVE-2026-56860 | Avoid quadratic complexity in resolvePath in net/url | 8.8 | 0.0055 | None reported |
| High | CVE-2026-32281 | Inefficient policy validation in crypto/x509 | 9.1 | 0.0036 | None reported |
| High | CVE-2026-56858 | Fix Javascript regexp context tracking in html/template | 8.8 | 0.0031 | None reported |
Showing 1 to 13 of 13
1
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.