# CVE-2026-13587: seladb PcapPlusPlus LightPcapNg light_pcapng.c parse_by_block_type heap-based overflow

> A heap-based buffer overflow in PcapPlusPlus allows remote attackers to execute arbitrary code or cause denial of service via crafted packets.

- **Severity:** Medium 6.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Jun 2026
- **Updated:** 29 Jun 2026
- **Also known as:** GHSA-94c3-8cq4-gwwg

## What is CVE-2026-13587?

CVE-2026-13587 is a medium-severity memory corruption vulnerability in seladb PcapPlusPlus, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-122 (Heap-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-13587?


## How do I fix CVE-2026-13587?

Upgrade to a fixed version.

## Is CVE-2026-13587 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13587 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13587 and fix it if it is affected.

What it is: CVE-2026-13587 is a medium-severity memory corruption vulnerability in seladb PcapPlusPlus, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13587 exists.

Affected product: seladb PcapPlusPlus. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-13587/ (Markdown: https://insights.sbomify.com/CVE-2026-13587/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13587
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13587
- OSV: https://osv.dev/vulnerability/CVE-2026-13587

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-13587/
Summaries are generated and may contain mistakes; the official description above is the record.