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CVE-2026-57053VulnerabilityPublished 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-2026-57053· Medium 4.0

Not known to be exploited · CVSS 4.0 Medium : upgrade Red Hat to 1.44 when convenient.

Data as of 31 Oct 2026, 20:20 UTC

CVSS 3.1 base score
4.0Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.44
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Jun 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 31 Oct 2026.

What to do

Upgrade libidn to 1.44.

Affected software

ProductAffectedFixed in
GNUlibidnAffected
  • <1.44
Fixed in
  • 1.44

AI-suggested

No configuration-level mitigation is available because the vulnerability depends on uninitialized stack content, making behavior non-deterministic and input filtering ineffective. Users should update to a fixed version of the libidn package once it is released. If you cannot patch yet, applications processing untrusted internationalized domain names should treat the output of idna_to_unicode_8z8z()/idna_to_unicode_8zlz() as unverified, perform independent comparisons against the original ACE-encoded input, or switch to using libidn2 for IDNA processing, which is not affected by this vulnerability.

Description

This update for libidn fixes the following issue: - CVE-2026-57053: out-of-bounds read in `ToUnicode` APIs (bsc#1268965).

References

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