7.5

CVE-2026-23490: pyasn1 has a DoS vulnerability in decoder

Modified
AliasesMGASA-2026-0020SUSE-SU-2026:0252-1SUSE-SU-2026:0300-1
Published 16-01-2026Last modified 17-09-2026

Vulnerability summary

CVE-2026-23490 is a high (CVSS 7.5) vulnerability in debian debian_linux. EPSS estimates a 0.76% chance of exploitation in the next 30 days, higher than 55.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.76%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 4
OPENSUSE-SU-2026:10078-1RHSA-2026:13508RHSA-2026:13512RHSA-2026:17446RHSA-2026:17595RHSA-2026:3958

Timeline

  1. 16-01-2026
    PublishedVulnerability first disclosed.
  2. 17-09-2026
    Last modifiedVulnerability information updated.

Description

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.2, a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets. This vulnerability is fixed in 0.6.2.

CVSS metrics

8 scores · 8 sources · 1 version

EPSS trend

Probability

0.76%

Chance of exploitation in the next 30 days

Percentile

55%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 0.77% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat90 products
  • fence-agents< 0:4.10.0-98.el9_7.5 | < 0:4.16.0-13.el10_1.2 | < 0:4.2.1-129.el8_10.21 | < 0:4.2.1-112.el8_8.16 | < 0:4.10.0-86.el9_6.15 | < 0:4.10.0-43.el9_2.19 | < 0:4.10.0-62.el9_4.22 | < 0:4.10.0-20.el9_0.28 | < 0:4.16.0-5.el10_0.8 | < 0:4.2.1-65.el8_4.27 | < 0:4.2.1-89.el8_6.21
  • fence-agents-aliyun< 0:4.10.0-98.el9_7.5 | < 0:4.16.0-13.el10_1.2 | < 0:4.2.1-129.el8_10.21 | < 0:4.2.1-112.el8_8.16 | < 0:4.10.0-86.el9_6.15 | < 0:4.10.0-43.el9_2.19 | < 0:4.10.0-62.el9_4.22 | < 0:4.10.0-20.el9_0.28 | < 0:4.16.0-5.el10_0.8 | < 0:4.2.1-65.el8_4.27 | < 0:4.2.1-89.el8_6.21
  • fence-agents-aliyun-debuginfo< 0:4.2.1-129.el8_10.21 | < 0:4.2.1-112.el8_8.16 | < 0:4.2.1-65.el8_4.27 | < 0:4.2.1-89.el8_6.21
  • fence-agents-all< 0:4.10.0-98.el9_7.5 | < 0:4.16.0-13.el10_1.2 | < 0:4.2.1-129.el8_10.21 | < 0:4.2.1-112.el8_8.16 | < 0:4.10.0-86.el9_6.15 | < 0:4.10.0-43.el9_2.19 | < 0:4.10.0-62.el9_4.22 | < 0:4.10.0-20.el9_0.28 | < 0:4.16.0-5.el10_0.8 | < 0:4.2.1-65.el8_4.27 | < 0:4.2.1-89.el8_6.21
  • fence-agents-amt-ws< 0:4.10.0-98.el9_7.5 | < 0:4.16.0-13.el10_1.2 | < 0:4.2.1-129.el8_10.21 | < 0:4.2.1-112.el8_8.16 | < 0:4.10.0-86.el9_6.15 | < 0:4.10.0-43.el9_2.19 | < 0:4.10.0-62.el9_4.22 | < 0:4.10.0-20.el9_0.28 | < 0:4.16.0-5.el10_0.8 | < 0:4.2.1-65.el8_4.27 | < 0:4.2.1-89.el8_6.21
Chainguard34 products
  • airflow-2< 2.11.0-r24
  • airflow-3< 3.1.6-r2
  • ansible-operator< 1.42.0-r6
  • ansible-operator-fips< 1.42.0-r4
  • apache-beam-python-3.11-sdk< 2.71.0-r0
Suse24 products
  • python-pyasn1&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS< 0.4.2-150000.3.13.1 | < 0.5.0-150400.12.10.1
  • python-pyasn1&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS< 0.4.2-150000.3.13.1 | < 0.5.0-150400.12.10.1
  • python-pyasn1&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS< 0.4.2-150000.3.13.1 | < 0.5.0-150400.12.10.1
  • python-pyasn1&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS< 0.4.2-150000.3.13.1 | < 0.5.0-150400.12.10.1
  • python-pyasn1&distro=SUSE Linux Enterprise Micro 5.2< 0.4.2-150000.3.13.1
Wolfi13 products
  • airflow-3< 3.1.6-r2
  • dask-kubernetes< 2025.7.0-r6
  • k8s-sidecar< 2.4.0-r0
  • katib-earlystopping< 0.19.0-r4
  • kserve-storage-controller< 0.16.0-r9
Debian2 products
  • pyasn1< 0.6.2-1 | < 0.4.8-3+deb12u1 | < 0.6.1-1+deb13u1 | < 0.4.8-1+deb11u1
  • debian_linuxEOL11.0
Opensuse2 products
  • python-pyasn1&distro=openSUSE Leap 15.6< 0.5.0-150400.12.10.1
  • python-pyasn1&distro=openSUSE Leap 16.0< 0.6.1-160000.3.1
Mageia1 product
  • python-pyasn1< 0.4.8-6.1.mga9
Pyasn11 product
PyPI1 product
  • pyasn1≥ 0.6.1, < 0.6.2
Ubuntu1 product
  • pyasn1< 0.1.7-1ubuntu2.1+esm1 | < 0.1.9-1ubuntu0.1~esm1 | < 0.4.2-3ubuntu0.18.04.1~esm1 | < 0.4.2-3ubuntu0.20.04.1~esm1 | < 0.4.8-1ubuntu0.1 | < 0.4.8-4ubuntu0.1 | < 0.6.1-1ubuntu0.1

10 vendors · 169 products

References

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