CVE-2026-69152

brace-expansion: DoS via unbounded intermediate arrays, bypassing the CVE-2026-14257 mitigation

The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.18, 2.1.4, 3.0.6, and 5.0.9, expand() does not apply maxLength while constructing comma-alternative intermediate arrays or padded sequences, allowing attacker-controlled input to exhaust memory or block the event loop. The fix for CVE-2026-14257 is bypassed by the vulnerability. This issue is fixed in versions 1.1.18, 2.1.4, 3.0.6, and 5.0.9.

Affected

juliangruber · brace-expansion

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.65% chance of exploitation in the next 30 days, 50th percentile

Published

2026-08-03

Proof-of-concept exploits (1)

• advisories/GHSA-rgw5-rvv9-x895

Security advisories

• juliangruber/brace-expansion/security/advisories/GHSA-rgw5-rvv9-x895
• juliangruber/brace-expansion/commit/139d015104e71433ad52a41d19467c48ecbb2c7d

References

• CVE Record
• NVD entry