Vulnerability · Published Nov 2, 2026 · Assigned by VulnCheck
CVE-2025-71450inih before r63 Stack Buffer Under-Read in ini_parse_stream Discard Loop
Low 3.3
In plain English
A low-severity security flaw in inih from benhoyt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Severity (CVSS 3.1)3.3Low
Exploit odds (30 days)0.1%top 97.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
inih before r63 contains a one-byte stack buffer under-read in ini_parse_stream() in ini.c that allows attackers to read abyss[-1] via an embedded NUL byte after an overlong line. Attackers can supply an INI file or string with a line of at least INI_MAX_LINE-1 bytes followed by a NUL byte, causing undefined behavior reported by memory sanitizers.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | libinih | no fix listed | UBUNTU-CVE-2025-71450 |
| Ubuntu:24.04:LTS | libinih | no fix listed | UBUNTU-CVE-2025-71450 |
| Ubuntu:26.04:LTS | libinih | no fix listed | UBUNTU-CVE-2025-71450 |
| Ubuntu:26.10 | libinih | no fix listed | UBUNTU-CVE-2025-71450 |
Affected products (as reported)
Weakness: CWE-127 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
References
- https://github.com/benhoyt/inih/pull/206 issue-tracking, patch
- https://github.com/benhoyt/inih/issues/223 issue-tracking
- https://github.com/benhoyt/inih/commit/8e06f6b77b5d4471bdc6d85ada81b67d37354a5c patch
- https://github.com/benhoyt/inih/blob/r62/ini.c#L162-L169 technical-description
- inih r63 Release Notes release-notes
- https://hackmd.io/@haindpwn/inih-long-line-discard-oob-read technical-description
- VulnCheck Advisory: inih before r63 Stack Buffer Under-Read in ini_parse_stream Discard Loop third-party-advisory