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CVE-2026-85977— Libtirpc: libtirpc: denial of service via unbounded memory allocation during portmapper response decoding

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 libtirpc 库中发现了一个漏洞。远程攻击者可以通过向使用 pmap_getmaps() 函数连接至攻击者控制主机的客户端应用程序发送特制的 PMAPPROC_DUMP 响应来利用该漏洞。由于该漏洞涉及无界解码，可能导致内存和 CPU 资源被过度占用，从而引发资源耗尽，导致客户端进程出现拒绝服务（DoS）攻击。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat Hardened Images any affected
Red Hat Red Hat OpenShift Container Platform 4 any affected
any affected
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I. Basic Information for CVE-2026-85977

Vulnerability Information
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Vulnerability Title
Libtirpc: libtirpc: denial of service via unbounded memory allocation during portmapper response decoding
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libtirpc. A remote attacker can exploit this vulnerability by sending specially crafted PMAPPROC_DUMP replies to a client application that uses the pmap_getmaps() function against an attacker-controlled host. This unbounded decoding can lead to excessive memory and CPU allocation, causing the client process to experience a Denial of Service (DoS) due to resource exhaustion.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
循环内过多的平台资源消耗
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-85977

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III. Intelligence Information for CVE-2026-85977

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Vendor Advisories for CVE-2026-85977 (2)

Same Patch Batch · Red Hat · 2026-10-16 · 15 CVEs total

CVE-2026-104715 7.8 HIGH Cifs-utils: mount.cifs credential-file option injection allows local privilege boundary by
CVE-2026-105958 7.5 HIGH Spice-server: spice: heap oob read/write via unchecked migration data offsets
CVE-2026-105959 7.5 HIGH Spice-server: spice: heap buffer overflow via glz dictionary max_encoders integer truncati
CVE-2026-62439 7.0 HIGH Gimp: gimp: file-pvr plug-in pvr file parsing integer overflow heap-based buffer overflow
CVE-2026-89085 6.6 MEDIUM Parted: parted: heap-based buffer overflow via crafted fat32 filesystem image
CVE-2026-111802 6.6 MEDIUM Nautilus: nautilus: arbitrary file deletion via trash symlink
CVE-2026-85231 6.5 MEDIUM Libtirpc: libtirpc: denial of service via unbounded memory allocation during rpcsec_gss de
CVE-2026-62438 6.1 MEDIUM Gimp: gimp: paa integer overflow out-of-bounds read
CVE-2026-111555 6.0 MEDIUM Luksmeta: missing slot-range validation permits out-of-gap device i/o
CVE-2026-89096 5.9 MEDIUM Nfs-utils: nfs-utils: denial of service via memory leak in rpc.statd
CVE-2026-89088 5.5 MEDIUM Parted: parted: denial of service via heap buffer overflow during fat16 resize
CVE-2026-89098 5.5 MEDIUM Nfs-utils: nfs-utils: denial of service via assertion failure in fsidd
CVE-2026-17591 3.6 LOW Libarchive: libarchive: use-after-free via aliased mac metadata copy
CVE-2026-111581 3.3 LOW Libblockdev: libblockdev: argument injection in ntfs/vfat label-setting helpers via udisks

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-1050

V. Comments for CVE-2026-85977

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