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CVE-2026-33818VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-33818· High 7.5

Not known to be exploited · CVSS 7.5 High · fixed in Red Hat package updates : patch Red Hat asn1 soon.

Data as of 14 Nov 2026, 20:44 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CISA-ADPCVSS 3.17.5
EPSS
0.5% chance of exploitation in 30 days – higher than 47% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.27.0-rc.3, 1.26.6, 1.25.13
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 13 Aug 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 14 Nov 2026.

What to do

Upgrade encoding/asn1 to 1.27.0-rc.3, 1.26.6 or 1.25.13.

Affected software

ProductAffectedFixed in
Go standard libraryencoding/asn1Affected
  • >=1.27.0-0 <1.27.0-rc.3
Fixed in
  • 1.27.0-rc.3
Go standard libraryencoding/asn1Affected
  • >=1.26.0-0 <1.26.6
Fixed in
  • 1.26.6
Go standard libraryencoding/asn1Affected
  • <1.25.13
Fixed in
  • 1.25.13
Goencoding/asn1pkg:golang/encoding/asn1Other threatsAffected
  • <1.25.13
  • >=1.26.0-0 <1.26.6
  • >=1.27.0-0 <1.27.0-rc.3
Fixed in
  • 1.25.13
  • 1.26.6
  • 1.27.0-rc.3

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

AI-suggested

A patch is available from Red Hat as part of updated Hardened Images RPMs, specifically golang1.25 version 1.25.13-0.1.hum1 and related packages. Users should apply these updates promptly to remediate the vulnerability. No additional mitigations are specified or required beyond applying the official updates.

Description

CVE-2026-33818 is a high-severity denial-of-service vulnerability in the Go standard library's encoding/asn1 component. It allows an attacker to cause uncontrolled resource consumption via malformed inputs, leading to denial of service. Red Hat has released updated Hardened Images RPMs containing patched versions of Go 1.25.13 to remediate this and related issues. The vulnerability affects various Red Hat products that include these Go components. No known exploits are reported in the wild.

References

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