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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, 11:16 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 41% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
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 4 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 for Red Hat Enterprise Linux 9.4 and related variants that address these vulnerabilities. Users should apply the security update as described in the Red Hat advisory (RHSA-2026:95015) to remediate these issues. No additional mitigation steps are indicated beyond applying the official update.

Description

Multiple denial of service vulnerabilities and a man-in-the-middle vulnerability were identified in the Red Hat build of OpenTelemetry Collector components, primarily related to golang libraries such as net/http, crypto/tls, net/textproto, and crypto/x509. These issues allow denial of service via crafted HTTP Range headers, excessive HTTP/2 SETTINGS frames, memory limit bypass in multipart parsing, and multiple ECH outer extension references, as well as man-in-the-middle attacks via untrusted intermediate certificates. Red Hat has released security updates addressing these vulnerabilities in OpenTelemetry Collector packages for Red Hat Enterprise Linux 9.4 variants.

References

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