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CVE-2026-25681VulnerabilityPublished Updated

Red Hat Security Advisory: image-builder security update

Affects Red Hat image-builderSource GCVE Database

0

Mentioned vulnerabilities

Authoritative record:CVE-2026-25681· Medium 6.1

Not known to be exploited · CVSS 6.1 Medium : upgrade Red Hat html to 0.55.0 when convenient.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.55.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade golang.org/x/net/html to 0.55.0.

Affected software

ProductAffectedFixed in
golang.org/x/netgolang.org/x/net/htmlAffected
  • <0.55.0
Fixed in
  • 0.55.0
Gogolang.org/x/net/htmlpkg:golang/golang.org/x/net/htmlOther threatsAffected
  • =0
Fixed in–
Gogolang.org/x/net/htmlpkg:golang/golang.org/x/net/htmlOther threatsAffected
  • <0.55.0
Fixed in
  • 0.55.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

A local binary for building customized OS artifacts such as VM images and OSTree commits. Uses osbuild under the hood. Security Fix(es): * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass (CVE-2026-27136) * golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting (CVE-2026-25681) * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree rendering (CVE-2026-42502) * github.com/open-telemetry/opentelemetry-go: go.opentelemetry.io/otel/baggage: go.opentelemetry.io/otel/propagation: OpenTelemetry-Go: Denial of Service via oversized baggage headers (CVE-2026-41178) 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.

References

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