What is CVE-2026-34527?

CVE-2026-34527 is a medium-severity vulnerability in Sandboxie-Plus Sandboxie, classified under Use of Weak Hash. CVSS score: 5.3/10. Published 2026-05-05.

How severe is CVE-2026-34527?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Sandboxie-Plus Sandboxie

CVE-2026-34527

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, SbieIniServer::HashPassword converts a SHA-1 digest to hexadecimal incorrectly. The high nibble of each byte is shifted right by 8 instead of 4, which always produces zero for an 8-bit value. As a result, the stored EditPassword hash only preserves the low nibble of each digest byte, reducing the effective entropy from 160 bits to 80 bits. This is layered on top of an unsalted SHA-1 scheme. The reduced entropy makes leaked or backed-up password hashes materially easier to brute-force. This issue has been fixed in version 1.17.3.

EPSS: 0.001 (0.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Sandboxie-plus Sandboxie — versions < 1.17.3

Weakness classification (CWE)

CWE-328 — Use of Weak Hash

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34527?: CVE-2026-34527 is a medium-severity vulnerability in Sandboxie-Plus Sandboxie, classified under Use of Weak Hash. CVSS score: 5.3/10. Published 2026-05-05.
How severe is CVE-2026-34527?: Medium severity. CVSS v3 base score is 5.3 out of 10.