CVE-2026-6479VulnerabilityPublished 26 Aug 2026Updated 5 Nov 2026

Red Hat Security Advisory: postgresql:12 security update

Affects Red Hat postgresql:12Source GCVE Database

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Authoritative record:CVE-2026-6479· High 7.5

Not known to be exploited · CVSS 7.5 High · fixed in Red Hat package updates : patch Red Hat postgresql:12 soon.

Data as of 6 Nov 2026, 01:34 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 18.4, 17.10, 16.14 +2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 14 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
PostgreSQL	Affected >=18 <18.4	Fixed in 18.4
PostgreSQL	Affected >=17 <17.10	Fixed in 17.10
PostgreSQL	Affected >=16 <16.14	Fixed in 16.14
PostgreSQL	Affected >=15 <15.18	Fixed in 15.18
PostgreSQL	Affected <14.23	Fixed in 14.23

AI-suggested

Red Hat has released an official security update for PostgreSQL 12 on Red Hat Enterprise Linux 8.8 that addresses this vulnerability. Users should apply the update as detailed in the Red Hat advisory (RHSA-2026:60265) and the referenced article https://access.redhat.com/articles/11258 to remediate the issue. No additional mitigation steps are indicated.

Description

A denial of service vulnerability exists in PostgreSQL 12 due to uncontrolled recursion during SSL/GSS negotiation. This flaw could allow an attacker to cause the database server to become unresponsive. Red Hat has issued a security update for PostgreSQL 12 on Red Hat Enterprise Linux 8.8 to address this issue.

Impact

Successful exploitation of this vulnerability could cause a denial of service, making the PostgreSQL database server unavailable. There is no indication of remote code execution or data compromise from the provided information. No known exploits are reported in the wild at this time.

Summary

The vulnerability identified as CVE-2026-6479 affects PostgreSQL 12 and involves uncontrolled recursion in the SSL/GSS negotiation process, which can lead to a denial of service condition. Red Hat Product Security has rated this update as Important and released a security advisory (RHSA-2026:60265) providing updated packages for Red Hat Enterprise Linux 8.8 variants. The advisory references a fix that mitigates the denial of service by correcting the recursion handling in the affected PostgreSQL module.

CWE-606Unchecked Input for Loop Condition (opens in a new tab)
Base weakness
The product does not properly check inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping.
Implementation
Do not use user-controlled data for loop conditions.
Implementation
Perform input validation.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Nov 2026, 01:34 UTC

WeaknessesCWE-606

Technical details

References

Community reviews

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