Vulnerability · Published Sep 17, 2026 · Assigned by GitHub_M

CVE-2026-54578mport verify can compare stale checksum data after hashing failures

Low 2.0

In plain English

A low-severity security flaw in mport from MidnightBSD. 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 1% of all known vulnerabilities).

Severity (CVSS 4.0)2.0Low

Exploit odds (30 days)0.1%top 98.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

mport is the MidnightBSD Package Manager. Prior to 2.7.8, mport_verify_package() in libmport/verify.c could continue after MD5File() or SHA256_File() failed and compare an expected checksum with stale data in the hash buffer rather than a newly computed digest. An attacker able to influence an installed file or the conditions that make hashing fail could receive a misleading integrity result or hide a checksum failure. This issue is fixed in version 2.7.8.

Affected products (as reported)

Vendor	Product	Versions
MidnightBSD	mport	< 2.7.8

Weakness: CWE-354, CWE-755 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/MidnightBSD/mport/security/advisories/GHSA-hgmr-9p75-q5cg x_refsource_CONFIRM
https://github.com/MidnightBSD/mport/pull/138 x_refsource_MISC
https://github.com/MidnightBSD/mport/commit/cd9991c3cc1f60ecb3f378852ad8b5caa820e990 x_refsource_MISC
https://github.com/MidnightBSD/mport/releases/tag/2.7.8 x_refsource_MISC