Heap-based Buffer Overflow Affecting nginx package, versions [1.30.0,1.30.6)[1.31.2,1.31.7)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 Oct 2026
- disclosed14 Oct 2026
- creditUnknown
Introduced: 14 Oct 2026
NewCVE-2026-93479 (opens in a new tab)How to fix?
Upgrade nginx to version 1.30.6, 1.31.7 or higher.
Overview
Affected versions of this package are vulnerable to Heap-based Buffer Overflow in the map directive when regex matching is used and regex capture variables are referenced before the map output variable. An attacker can cause a heap buffer overflow by sending specially crafted HTTP requests. This may result in process crashes, denial of service, or, in rare cases where Address Space Layout Randomization (ASLR) is disabled or bypassed, possible code execution.
Workaround
This vulnerability can be mitigated by not using unnamed captures and instead using named captures only within the same block as the regex match.