# CVE-2026-16277: Rpcbind: rpcbind: stack buffer overflow in rpcinfo rpcbaddrlist()

CVE-2026-16277 is fixed in 3 products on 1 platform, first by ALAS2023-2026-3169, released November 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-16277
- Priority: Routine
- CVSS: 6.5 (Moderate)
- EPSS: 0.0051
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 23, 2026
- Weakness: Stack-based Buffer Overflow
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-16277

## Description

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-94640: 	A flaw was found in rpcbind. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by sending a large number of unique requests. The rpcbind service records previously unseen RPC (Remote Procedure Call) statistics in unbounded in-memory lists, leading to persistent memory growth and increased CPU usage. This can degrade or exhaust service availability.  CVE-2026-16461: 	A stack-based buffer overflow was found in rpcbind's rpcinfo utility. In rpcbdump() short mode (used by `rpcinfo -s`), version numbers from a remote RPCBPROC_DUMP reply are written into a fixed-size stack buffer without bounds checking. A user or administrator who runs `rpcinfo -s` against a malicious or compromised rpcbind endpoint could experience a crash or denial of service of the rpcinfo client.  CVE-2026-16277: 	A stack-based buffer overflow was found in rpcbind's rpcinfo utility. When querying a remote rpcbind service with `rpcinfo -l`, address information returned by the server is copied into a fixed-size buffer without sufficient bounds checking. A malicious or compromised rpcbind server could use this flaw to crash the rpcinfo client, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | rpcbind amzn 2023 | 1.2.6-0.amzn2023.0.3 | [ALAS2023-2026-3169](https://patchblox.com/security/data/fix/linux/alas2023-2026-3169.md) | Nov 7, 2026 |
| Linux | rpcbind-debuginfo amzn 2023 | 1.2.6-0.amzn2023.0.3 | [ALAS2023-2026-3169](https://patchblox.com/security/data/fix/linux/alas2023-2026-3169.md) | Nov 7, 2026 |
| Linux | rpcbind-debugsource amzn 2023 | 1.2.6-0.amzn2023.0.3 | [ALAS2023-2026-3169](https://patchblox.com/security/data/fix/linux/alas2023-2026-3169.md) | Nov 7, 2026 |

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Data as of 2026-11-10T07:50:38Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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