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CVE-2026-6464VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Update Infrastructure 5.3 security update

Affects Red HatSource GCVE Database

0

Mentioned vulnerabilities

Authoritative record:CVE-2026-6464· High 8.1

Not known to be exploited · CVSS 8.1 High · fixed in Red Hat package updates : patch Red Hat postgresql soon.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
8.1High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 29% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 18.6, 17.11, 16.15 +3
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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. Weaponised: 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 26 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
PostgreSQLAffected
  • >=18 <18.6
Fixed in
  • 18.6
PostgreSQLAffected
  • >=17 <17.11
Fixed in
  • 17.11
PostgreSQLAffected
  • >=16 <16.15
Fixed in
  • 16.15
PostgreSQLAffected
  • >=15 <15.19
Fixed in
  • 15.19
PostgreSQLAffected
  • <14.24
Fixed in
  • 14.24
Postgresqlpostgresql/postgresqlpkg:deb/postgresql/postgresqlOther threatsAffected
  • <14.24
  • <15.19
  • <16.15
  • <17.11
  • <18.5
Fixed in
  • 14.24
  • 15.19
  • 16.15
  • 17.11
  • 18.5

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

AI-suggested

Red Hat recommends confirming whether any service is listening on UDP port 443 for QUIC traffic. If so, rate-limit or firewall inbound UDP 443 traffic to block or slow QUIC Initial packets before they reach the vulnerable listener. If QUIC/HTTP3 is not required, disable the QUIC server listener to remove the vulnerable code path. Application owners can adjust the SSL_VALUE_QUIC_MAX_PENDING_CONNS setting if needed. Upgrade OpenSSL to a fixed release when it becomes available. These mitigations reduce risk until a patch is released.

Description

A security update for Red Hat Update Infrastructure 5.3 addresses multiple vulnerabilities including CVE-2026-14456, which affects the OpenSSL QUIC server implementation. This flaw allows a remote attacker to cause unbounded memory growth by sending numerous QUIC Initial packets, potentially leading to a denial of service. The vulnerability only affects systems explicitly enabling the QUIC server listener and not earlier OpenSSL versions or the FIPS module. Mitigations include rate-limiting or firewalling UDP port 443 to block or slow QUIC traffic, disabling QUIC if not needed, and upgrading OpenSSL when a fixed release is available.

References

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