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CVE-2026-78667VulnerabilityPublished

Red Hat Security Advisory: opentelemetry-collector security update

Affects Red Hat opentelemetry-collectorSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-78667· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade Red Hat http to 1.27.2 or 1.26.9 soon.

Data as of 4 Nov 2026, 08:45 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.27.2, 1.26.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: 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 3 Nov 2026.

What to do

Upgrade net/http to 1.27.2 or 1.26.9.

Affected software

ProductAffectedFixed in
Go standard librarynet/httpAffected
  • >=1.27.0-0 <1.27.2
Fixed in
  • 1.27.2
Go standard librarynet/httpAffected
  • <1.26.9
Fixed in
  • 1.26.9
Gonet/httppkg:golang/net/httpOther threatsAffected
  • <1.26.9
  • >=1.27.0-0 <1.27.2
Fixed in
  • 1.26.9
  • 1.27.2

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

AI-suggested

Red Hat has released updated OpenTelemetry Collector packages that address these vulnerabilities. Users should apply the security update for OpenTelemetry Collector on Red Hat Enterprise Linux 9.6 Extended Update Support and related variants as described in the Red Hat advisory (RHSA-2026:95014). Details on applying the update are available at https://access.redhat.com/articles/11258. No additional mitigations are indicated by the vendor advisory.

Description

Multiple denial of service vulnerabilities and a man-in-the-middle vulnerability have been identified in the Red Hat build of OpenTelemetry Collector components. These issues affect various Go language libraries used by the collector, including net/http, crypto/tls, net/textproto, and crypto/x509. The vulnerabilities include denial of service via crafted HTTP Range headers, excessive HTTP/2 SETTINGS frames, memory limit bypass in multipart form parsing, and man-in-the-middle attacks via untrusted intermediate certificates. Red Hat has released security updates addressing these issues for Red Hat Enterprise Linux 9.6 Extended Update Support and related variants.

References

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