# OSV-2026-1070 - UNKNOWN READ in bytes1_char_at

Source: https://junglewise.ai/threats/osv-2026-1070-unknown-read-in-bytes1-char-at-150dd073  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-28  
License: CC BY 4.0 with a link back

Severity: info · Published 2026-07-28

UNKNOWN READ in bytes1_char_at

Technologies: [mrab-regex (PyPI)](https://junglewise.ai/threats/technologies/mrab-regex). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Informational severity, published 28 July 2026.

**Which products and versions are affected?** mrab-regex (PyPI) GIT:introduced=07dfa3b6b2d5a30919ac8564c1542a4487d40f8e,fixed=0e8cb0596ba6572c66e5d153a1d7c901b381e15e.

**Is there a fix for This vulnerability?** Yes. mrab-regex (PyPI): upgrade to 0e8cb0596ba6572c66e5d153a1d7c901b381e15e or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run mrab-regex (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- mrab-regex (PyPI): upgrade to 0e8cb0596ba6572c66e5d153a1d7c901b381e15e or later

  ```sh
  pip install "mrab-regex>=0e8cb0596ba6572c66e5d153a1d7c901b381e15e"
  ```


## Affected products

- mrab-regex (PyPI) GIT:introduced=07dfa3b6b2d5a30919ac8564c1542a4487d40f8e,fixed=0e8cb0596ba6572c66e5d153a1d7c901b381e15e

## Related threats

- [OSV-2026-1125 - Segv on unknown address in match_many_CHARACTER_REV](https://junglewise.ai/threats/osv-2026-1125-segv-on-unknown-address-in-match-many-character-rev-2df52322)
- [OSV-2026-1084 - UNKNOWN READ in bytes1_char_at](https://junglewise.ai/threats/osv-2026-1084-unknown-read-in-bytes1-char-at-f9dcd088)
- [OSV-2026-1072 - UNKNOWN READ in _regex.cpython-311-x86_64-linux-gnu.so](https://junglewise.ai/threats/osv-2026-1072-unknown-read-in-regex-cpython-311-x86-64-linux-gnu-so-0812e45a)
- [OSV-2023-885 - UNKNOWN READ in bytes1_char_at](https://junglewise.ai/threats/osv-2023-885-unknown-read-in-bytes1-char-at-f66329ac)