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CVE-2026-42499VulnerabilityPublished 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-2026-42499· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade Red Hat mail to 1.26.3 or 1.25.10 soon.

Data as of 29 Oct 2026, 09:27 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.7% chance of exploitation in 30 days – higher than 56% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.26.3, 1.25.10
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 7 May 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 29 Oct 2026.

What to do

Upgrade net/mail to 1.26.3 or 1.25.10.

Affected software

ProductAffectedFixed in
Go standard librarynet/mailAffected
  • >=1.26.0-0 <1.26.3
Fixed in
  • 1.26.3
Go standard librarynet/mailAffected
  • <1.25.10
Fixed in
  • 1.25.10
Gonet/mailpkg:golang/net/mailOther threatsAffected
  • =0
  • =1.26.0-0
Fixed in–
Gonet/mailpkg:golang/net/mailOther threatsAffected
  • <1.25.10
  • >=1.26.0-0 <1.26.3
Fixed in
  • 1.25.10
  • 1.26.3

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

AI-suggested

Currently, no mitigation is available that meets Red Hat's criteria for ease of use, deployment, applicability, or stability. Until then, limiting exposure to untrusted input that triggers email address parsing may reduce risk.

Description

A denial of service vulnerability exists in the net/mail package of the Go standard library used in Red Hat Hardened Images. A remote attacker can exploit this by sending specially crafted pathological email addresses that cause excessive resource consumption during parsing, leading to a denial of service condition. This affects Go version 1.25.10-2.2.hum1 RPMs on aarch64 and x86_64 architectures.

References

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