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CVE-2026-14672— PostgreSQL observable response discrepancy with non-default scram_iterations provides user existence oracle

Quick assessment

Affected
n/a PostgreSQL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PostgreSQL是PostgreSQL组织开源的一套自由的对象关系型数据库管理系统。该系统支持大部分SQL标准并且提供了许多其他特性,例如外键、触发器、视图等。 PostgreSQL 18.5之前版本、17.11之前版本和16.15之前版本存在侧信道信息泄露漏洞，该漏洞源于SCRAM身份验证中的可观察响应差异，可能导致未经身份验证的用户通过观察SCRAM迭代计数来测试用户是否存在。

CVSS 5.3 · Medium EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1087.004 · Cloud Account

Affected Version Matrix 3

VendorProduct Version RangeStatus
n/a PostgreSQL 18< 18.6 affected
17< 17.11 affected
16< 16.15 affected
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I. Basic Information for CVE-2026-14672

Vulnerability Information
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Vulnerability Title
PostgreSQL observable response discrepancy with non-default scram_iterations provides user existence oracle
Source: CVE Program / CVE List V5
Vulnerability Description
Observable response discrepancy in PostgreSQL SCRAM authentication allows an unauthenticated user to test the existence of a user via observing the SCRAM iteration count. This requires the probed user to have a non-default scram_iterations count, because the authentication challenge for a nonexistent user reports the default scram_iterations. Within major versions 16-18, minor versions before PostgreSQL 18.6, 17.11, and 16.15 are affected. Versions before PostgreSQL 16 are unaffected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
响应差异性信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
PostgreSQL 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PostgreSQL是PostgreSQL组织开源的一套自由的对象关系型数据库管理系统。该系统支持大部分SQL标准并且提供了许多其他特性,例如外键、触发器、视图等。 PostgreSQL 18.5之前版本、17.11之前版本和16.15之前版本存在侧信道信息泄露漏洞，该漏洞源于SCRAM身份验证中的可观察响应差异，可能导致未经身份验证的用户通过观察SCRAM迭代计数来测试用户是否存在。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- PostgreSQL 18 ~ 18.6 -

II. Public POCs for CVE-2026-14672

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III. Intelligence Information for CVE-2026-14672

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Vendor Advisories for CVE-2026-14672 (1)

Same Patch Batch · n/a · 2026-08-13 · 31 CVEs total

CVE-2026-14680 8.8 HIGH PostgreSQL type confusion via "internal" arguments
CVE-2026-14671 8.8 HIGH PostgreSQL refint plan cache type confusion executes arbitrary code
CVE-2026-19385 8.8 HIGH PostgreSQL pg_dump heap buffer overflow executes arbitrary code
CVE-2026-18408 8.8 HIGH PostgreSQL psql \unrestrict lets superuser of pg_dump origin server execute arbitrary code
CVE-2026-16239 8.8 HIGH PostgreSQL type confusion in cursor CLOSE + DECLARE executes arbitrary code
CVE-2026-16238 8.8 HIGH PostgreSQL type confusion in pg_restore_attribute_stats() executes arbitrary code
CVE-2026-15742 8.8 HIGH PostgreSQL fuzzystrmatch writes effectively-arbitrary addresses, via integer wraparound
CVE-2026-15741 8.8 HIGH PostgreSQL expression deparse allows SQL injection via EXTRACT argument
CVE-2026-14677 8.8 HIGH PostgreSQL 32-bit pltcl and plperl undersize allocations, via integer wraparound
CVE-2026-14676 8.8 HIGH PostgreSQL pg_stat_statements heap buffer overflow executes arbitrary code
CVE-2026-14670 8.8 HIGH PostgreSQL plperl tied object heap buffer overflow executes arbitrary code
CVE-2026-14669 8.8 HIGH PostgreSQL to_char heap buffer overflow executes arbitrary code
CVE-2026-14662 8.8 HIGH PostgreSQL tsvector and tsquery undersize allocations, via integer wraparound
CVE-2026-14664 8.8 HIGH PostgreSQL regexp heap buffer overflow executes arbitrary code
CVE-2026-14679 8.2 HIGH PostgreSQL stack buffer overflow in argument match writes 0x0 and 0x1 to server memory
CVE-2026-6464 8.1 HIGH PostgreSQL psql COPY FROM STDIN early failure processes data lines as psql commands
CVE-2026-14668 8.1 HIGH PostgreSQL ctid type confusion in selectivity estimator discloses derivative of arbitrary
CVE-2026-6471 7.2 HIGH PostgreSQL logical decoding can dlopen arbitrary file
CVE-2026-14663 6.5 MEDIUM PostgreSQL pgcrypto, for OpenSSL-disabled ciphers, silently encrypts to and decrypts from
CVE-2026-18024 4.3 MEDIUM PostgreSQL ascii() function reads past end of buffer

Showing top 20 of 31 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: PostgreSQL
Same vendor: n/a
Same weakness: CWE-204

V. Comments for CVE-2026-14672

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