CVE Intelligence
Medium Authentication

CVE-2026-111438 — check_hba_replication 认证与访问控制绕过

在 openGauss-server 的 src/common/backend/libpq/hba.cpp 中，复制连接认证存在访问控制绕过。hba_getauthmethod() 在处理 HADR/SW 复制发送方时，不要求 is_node_internal_connection()，直接调用 check_hba_replication()。check_hba_replication() 仅按 replication 标记做弱匹配，缺少普通 check_hba() 中的远程 trust 禁止等完整校验。因此，非内部网络的 HADR/SW 复制连接可绕过内部连接限制和完整 pg_hba 策略完成认证，进而通过复制协议读取备份与日志数据。 此问题随 HADR 复制发送方绕过内部连接校验进入代码，自 3.0.0 起即存在。受影响版本包括 3.0.x、3.1.x、5.0.x、5.1.0、6.0.x，以及 7.0.0-RC1、7.0.0-RC2、7.0.0-RC3。该问题已在 7.0.0-LTS版本修复，通过要求 HADR/SW 复制发送方必须经过 is_node_internal_connection 校验，使外部复制连接改走普通 check_hba() 并触发禁止远程 trust 策略。修复pr见https://gitcode.com/opengauss/openGauss-server/pull/9757。

Published Oct 19, 2026 · Updated Oct 19, 2026 · Sources: CVE Program (cve.org) e CISA ADP, NIST National Vulnerability Database, GitHub Security Advisories · CNA: openGauss

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.4% (30-day exploitation probability)+4
  • Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.36%
ahead of 28% of scored CVEs · Oct 19, 2026
Affects
openGauss-server
openGauss-server
CVSS base
6.5
Medium · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (openGauss-server openGauss-server).
  2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  3. Search available logs for exploit probes matching the vulnerability class (authentication), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
openGauss-server openGauss-server version 3.0.0-3.0.5version 3.1.0-3.1.1version 5.0.0-RC1version 5.0.0-5.0.3version 6.0.0-RC1version 6.0.0-6.0.6version 7.0.0-RC1, 7.0.0-RC2, 7.0.0-RC3 Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
6.5 CVSS 3.1 Medium 1.2 5.2 a1a479f7-907b-4ae8-a999-9148cadc9224 via NIST National Vulnerability Database
6.5 CVSS 3.1 Medium — — GitHub, Inc. via GitHub Security Advisories
6.5 CVSS 3.1 Medium — — openGauss via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N (score shown at the top: a1a479f7-907b-4ae8-a999-9148cadc9224)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-288 · Authentication Bypass Using an Alternate Path or Channel

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Review authentication logs: logins without MFA, anomalous sessions and recently created accounts.
web/proxy/WAF logsnetwork IDS/IPSauthentication logs

Timeline

What happened to this CVE, newest first.

  • 2026
  • Source status changed · Received → Deferred
    Oct 19, 2026 · NIST National Vulnerability Database
  • SSVC assessment updated
    Oct 19, 2026 · CVE Program (cve.org) e CISA ADP
  • Source status changed · Published → Received
    Oct 19, 2026 · NIST National Vulnerability Database
  • Record published
    Oct 19, 2026
  • CVSS changed · 6.5
    Oct 19, 2026 · CVE Program (cve.org) e CISA ADP
  • Source status changed · → Published
    Oct 19, 2026 · CVE Program (cve.org) e CISA ADP
  • Record created in this database
    Oct 19, 2026 · CVE Program (cve.org) e CISA ADP
  • CVE published
    Oct 19, 2026 · openGauss

Source activity

Repeated readings are counted rather than listed.

  • 1× References added · Oct 19, 2026 – Oct 19, 2026
  • 1× Official description updated · Oct 19, 2026 – Oct 19, 2026

References

3 on the record

Elsewhere on this site

openGauss-server
every CVE for this vendor
Authentication
same class
CWE-288
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-111439 pg_read_binary_file_blocks 缺少初始用户权限校验，普通用户可读取 relation 文件块 1d
  • CVE-2026-111441 HLL 反序列化 lenTotal/lenUsed 校验缺失导致堆越界写 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-111438 is "check_hba_replication 认证与访问控制绕过", rated Medium. It affects openGauss-server (openGauss-server); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.5 describes technical severity. EPSS 0.36% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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