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CVE-2026-85977

Libtirpc: libtirpc: denial of service via unbounded memory allocation during portmapper response decoding

5.3 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.42%Up 0.2 points since Oct 17, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.3

Libtirpc: libtirpc: denial of service via unbounded memory allocation during portmapper response decoding

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.

Record
CVE-2026-85977
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-1050
Updated
2026-11-06
EUVDEUVD-2026-103020 5.3

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.

Record
EUVD-2026-103020
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-06
GitHub AdvisoriesGHSA-vc3g-5238-rmmw 5.3

A flaw was found in libtirpc. A remote attacker can exploit this vulnerability by sending...

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.

Record
GHSA-vc3g-5238-rmmw
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-1050
Updated
2026-11-02
NVD 5.3

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.

Record
CVE-2026-85977
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-1050
Updated
2026-11-06
OSVBELL-CVE-2026-85977 5.3
Record
BELL-CVE-2026-85977
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2026-85977 5.3

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.

Record
DEBIAN-CVE-2026-85977
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-07
OSVRHSA-2026:80360 5.3

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:80360
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-85977 5.3

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.

Record
UBUNTU-CVE-2026-85977
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2026:12244-1 No score

libtirpc-devel-1.3.8-1.1 on GA media

These are all security issues fixed in the libtirpc-devel-1.3.8-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12244-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libtirpc
Alpaquita:23
 1.3.3-r0 and later None known
libtirpc
Alpaquita:25
 1.3.5-r0 and later None known
libtirpc
Alpaquita:stream
 1.3.3-r0 and later None known
libtirpc
Debian:12
 All versions, plus listed versions
1.3.3+ds-11.3.4+ds-11.3.4+ds-1.11.3.4+ds-1.1~exp11.3.4+ds-1.1~exp2
Show 5 moreShow less
1.3.4+ds-1.21.3.4+ds-1.31.3.6+ds-11.3.7+ds-11.3.7-0.1
 None known
libtirpc
Debian:13
 All versions, plus listed versions
1.3.6+ds-11.3.7+ds-11.3.7-0.1
 None known
libtirpc
Debian:14
 All versions, plus listed versions
1.3.6+ds-11.3.7+ds-11.3.7-0.1
 None known
libtirpc
Red Hat:hummingbird:1
 before 0:1.3.8-0.1.hum1
0:1.3.8-0.1.hum1
libtirpc-devel
Red Hat:hummingbird:1
 before 0:1.3.8-0.1.hum1
0:1.3.8-0.1.hum1
libtirpc
Ubuntu:14.04:LTS
 All versions, plus listed versions
0.2.2-5ubuntu10.2.2-5ubuntu20.2.2-5ubuntu2.1
 None known
libtirpc
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.2.5-10.2.5-1ubuntu0.1
 None known
Show 14 moreShow less
Affected packages
PackageAffectedFixed
ntirpc
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.3.1-1
 None known
libtirpc
Ubuntu:18.04:LTS
 All versions, plus listed versions
0.2.5-1.20.2.5-1.2ubuntu0.1
 None known
ntirpc
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.4.4-11.5.3-11.6.1-1
 None known
libtirpc
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.1.4-0.41.1.4-11.2.5-11.2.5-1ubuntu0.1
 None known
ntirpc
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.7.4-23.0-0ubuntu13.0-0ubuntu2
 None known
libtirpc
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.3.2-21.3.2-2build11.3.2-2ubuntu0.1
 None known
ntirpc
Ubuntu:22.04:LTS
 All versions, plus listed versions
3.4-2build13.4-2build23.5-13.5-2
 None known
libtirpc
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.3.3+ds-11.3.4+ds-11.3.4+ds-1build11.3.4+ds-1.11.3.4+ds-1.1build1
 None known
ntirpc
Ubuntu:24.04:LTS
 All versions, plus listed versions
4.3-24.3-34.3-3.14.3-3.1build14.3-3.1build2
 None known
libtirpc
Ubuntu:26.10
 All versions, plus listed versions
1.3.7-0.11.3.7+ds-1
 None known
ntirpc
Ubuntu:26.10
 All versions, plus listed versions
6.3-47.2-2ubuntu1
 None known
libtirpc
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.3.6+ds-11.3.6+ds-1ubuntu11.3.7-0.1
 None known
ntirpc
Ubuntu:26.04:LTS
 All versions, plus listed versions
6.3-26.3-36.3-4
 None known
libtirpc
openSUSE:Tumbleweed
From an advisory covering 2 CVEs
 before 1.3.8-1.1
1.3.8-1.1

History

History
RecordedChangedSources
affected, productsCVE List, EUVD, NVD
productsCVE List
factsEUVD
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-85977 is a medium vulnerability (CVSS 5.3) in Red Hat Enterprise Linux 10, published October 16, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. Fixed in libtirpc 0:1.3.8-0.1.hum1.

References

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