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EUVD-2026-36468

fkie_cve-2020-5243

uap-core before 0.7.3 is vulnerable to a denial of service attack when processing crafted User-Agent strings. Some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This has been patched in uap-core 0.7.3.

GHSA-cmcx-xhr8-3w9p — Denial of Service in uap-core when processing crafted User-Agent strings

Affected: npm: uap-core, RubyGems: user_agent_parser

### Impact

Some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings.

### Patches

Please update uap-core to &amp;gt;= v0.7.3

Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.

### Details

Each vulnerable regular expression reported here contains 3 overlapping capture groups. Backtracking has approximately cubic time complexity with respect to the length of the user-agent string.

#### Regex 1:

``` \bSmartWatch *\( *([^;]+) *; *([^;]+) *; ```

is vulnerable in portion ` *([^;]+) *` and can be attacked with

```python &amp;quot;SmartWatch(&amp;quot; + (&amp;quot; &amp;quot; * 3500) + &amp;quot;z&amp;quot; ``` e.g. ``` SmartWatch( z ```

#### Regex 2:

``` ; *([^;/]+) Build[/ ]Huawei(MT1-U06|[A-Z]+\d+[^\);]+)[^\);]*\) ```

is vulnerable in portion `\d+[^\);]+[^\);]*` and can be attacked with

```python &amp;quot;;A Build HuaweiA&amp;quot; + (&amp;quot;4&amp;quot; * 3500) + &amp;quot;z&amp;quot; ```

#### Regex 3:

``` (HbbTV)/[0-9]+\.[0-9]+\.[0-9]+ \([^;]*; *(LG)E *; *([^;]*) *;[^;]*;[^;]*;\) ```

is vulnerable in portion ` *([^;]*) *` and can be attacked with

```python &amp;quot;HbbTV/0.0.0 (;LGE;&amp;quot; + (&amp;quo…

gsd-2020-5243

UBUNTU-CVE-2020-5243

Affected: Ubuntu:20.04:LTS: uap-core, Ubuntu:22.04:LTS: uap-core, Ubuntu:24.04:LTS: uap-core, Ubuntu:25.10: uap-core, Ubuntu:26.04:LTS: uap-core