CVE-2026-18024— PostgreSQL ascii() function reads past end of buffer
Possible ATT&CK Techniques 1AI
T1005 · Data from Local SystemAffected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| n/a | PostgreSQL | 18< 18.5 | affected |
17< 17.11 | affected | ||
16< 16.15 | affected | ||
15< 15.19 | affected | ||
< 14.24 | affected |
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I. Basic Information for CVE-2026-18024
Vulnerability Information
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Vulnerability Title
PostgreSQL ascii() function reads past end of buffer
Source: CVE Program / CVE List V5
Vulnerability Description
Buffer over-read in PostgreSQL ascii() SQL function allows a user to disclose up to 3 bytes after the end of a specific allocation, via a crafted text value. This is the same class of defect that CVE-2026-2006 fixed, though this instance has less impact. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区上溢读取
Source: CVE Program / CVE List V5
Vulnerability Title
PostgreSQL 缓冲区错误漏洞
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、16.15之前版本、15.19之前版本和14.24之前版本存在缓冲区错误漏洞，该漏洞源于ascii() SQL函数存在缓冲区过度读取，通过特制文本值，可能导致用户泄露特定分配结束后的最多3字节信息。
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 ~ 18.5 | - |
II. Public POCs for CVE-2026-18024
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-18024 (1)
Same Patch Batch · n/a · 2026-08-13 · 31 CVEs total
| CVE-2026-14671 | 8.8 HIGH | PostgreSQL refint plan cache type confusion executes 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-2026-18408 | 8.8 HIGH | PostgreSQL psql \unrestrict lets superuser of pg_dump origin server execute arbitrary code |
| CVE-2026-15741 | 8.8 HIGH | PostgreSQL expression deparse allows SQL injection via EXTRACT argument |
| CVE-2026-14680 | 8.8 HIGH | PostgreSQL type confusion via "internal" arguments |
| CVE-2026-19385 | 8.8 HIGH | PostgreSQL pg_dump heap buffer overflow executes arbitrary code |
| 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-2026-14664 | 8.8 HIGH | PostgreSQL regexp heap buffer overflow executes arbitrary code |
| CVE-2026-14662 | 8.8 HIGH | PostgreSQL tsvector and tsquery undersize allocations, via integer wraparound |
| 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-2026-14672 | 5.3 MEDIUM | PostgreSQL observable response discrepancy with non-default scram_iterations provides user |
Showing top 20 of 31 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: PostgreSQL
- CVE-2026-14671
PostgreSQL refint plan cache type confusion executes arbitra - CVE-2026-6471
PostgreSQL logical decoding can dlopen arbitrary file - CVE-2026-6469
PostgreSQL ALTER TABLE ALTER TYPE resets extended statistics - CVE-2026-6470
PostgreSQL fails to check type USAGE privilege - CVE-2026-6464
PostgreSQL psql COPY FROM STDIN early failure processes data
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V. Comments for CVE-2026-18024
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